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Frequency: From 40 Hz up to 110 Hz
Enclosure Type: Hybrid
Size: 62x62x62cm
Recommended Driver: Eminence 3015LF (view pdf), Eminence Kappa 15LF (view pdf) and Eminence Kappa 15LF Pro (view pdf), drivers with EBP of 100 or higher; Fs (27-45 Hz), Qts (0.26 - 0.38), Vas (150 - 300 L) / (7.4 - 11.1 ft^3). Where EBP = Fs / Qts
Cubo 15": Cubo is a multi purpose, stand alone bass bin that will equal or out run a single 18" BR*, of similar size, from ~ 40 Hz and up in terms of sensitivity. Utilising a non-expensive driver such as the Eminence 3015LF, Kappa 15LF and Kappa 15LF Pro** and a cut list from a single 18 mm*** sheet (244 x 122 cm) / (8' x 4') with a single angled cut, Cubo 15" realises a cost effective, small and light weight enclosure following the KISS-principle.
Development: In 2007 the first prototype was build and tested. Cubo 15" is the 4th prototype in a line of hybrides aiming at the achievements as stated above. The measurement below shows the gain over the stated basreflex (see * for details) . New measurements will follow on this page.
Footnotes:* 18Sound 18LW1400 in a 175 liter basreflex tuned to 37 Hz. (6,6 ft^3) vs. Cubo 15 ; Eminence Kappa 15LF. ** Apart from these drivers Cubo will work with a wide variëty of 15" drivers preferably with an EBP of 100 or higher; Fs (27-45 Hz), Qts (0.26 - 0.38), Vas (150 - 300 L) / (5.5 - 11.1 ft^3). Where EBP = Fs / Qts. If you're uncertain if a driver is suited, PM or mail me at
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*** If you want to use 15 mm material use 11-ply Baltic birch, nothing less. Plans available on request.
Cubo 15 plans are also available in an Imperial version, plan available on request.
Designer: Cubo15 [view profile].jpg)
Plan:
Cutsheet (clearly visible after download):
What's the SPL and the frequency response with an eminence kappa pro 15 lf?
Yeah whats the response plot with any drivers? Anyone tried these yet seems an easy build? No response from the designer? Thanks! 
It says measurments available on request. Mail him?
No need 
Hello,
This is the frequency response as hornresp predicts: [img]http://www.hardware-test.de/hornresp/EKP15LF.PNG[/img]
Unfortunately I have found that hornresp (and akabak) are a bit pestimistic when it comes to predicting the lower frequencies for this type of enclosure. I'm eagerly awaiting the day that the Dutch weathergods give me a day without snow, rain or temperatures below 5 degree Celcius.
The measurements show a 10 Hz improvement in low cutt off but were indoors (related to a 18" basreflex, to pick out the room nodes). As such, you probably understand I will only send those measurements on request. As soon as the weathergods show me worthy I will show real half space measurements on the plan-section.
As from usage with parties I can tell that it will go louder then a 18" reflex with less power, keep up and sound like it's hitting those low notes just as hard. A commercial version is in the make, same design, new goodies.
Regards
Cubo15
Here some pictures of the newer measurements, including results.
The initial measurements were outside;
[img]http://www.hardware-test.de/hornresp/Outside0.JPG[/img]
[img]http://www.hardware-test.de/hornresp/Outside1.JPG[/img]
[img]http://www.hardware-test.de/hornresp/Outside2.JPG[/img]
On occasion the wind blew that hard that it rose 40 dB in level (how is that I have angered you, mighty gods of weather), interfering with the measurements. So I went inside (450m^3) and threw some other cabinets into the mix (Cubo15 is in the middle):
[img]http://www.hardware-test.de/hornresp/3InaRow.JPG[/img]
As it was inside, I had to correlate the measurement of Cubo15 directly to the 18LW1400 basreflex (same spot, same influencial nodes, same voltage), thus showing the gain over the basreflex:
[img]http://www.hardware-test.de/hornresp/GainCubo15overBR18.PNG[/img]
On request some other pictures from Cubo15 (build by someone else);
Regards
Cubo15
Cubo- Great design, considering a couple of these after i finish some current project. But what really caught my eye was your computer case, been thinking about something like this for a while, looks good
is it possible to upscale this cabnet to suit a deltapro 18A. 18" speaker? I think i will build a pair of 15's anyway, but an 18" version would be a great Idea for me.
Cheers. 
@MAutopsy: Thanks, I can highly recommend it! Gives much more freedom in transport and events, might even have a little bit of advise if you'd need it
@COZY PILLOW: If you mail me I'll see what I can send you. I'm not sure how it will sound. I didn't like the 18LW1400 that much above 80 Hz in the previous prototype but the V18-1000 has been loving it. With a small adjustment the Delta Pro simulates smoothly.
Regards
Cubo15
PM'd cheers. 
One small question, which way is the driver suppose to be mounted? You have 2pics, one with the 3 boxes and the cubo15 is in the middle, the driver fires out and the other pic shows the driver firing into the box. Just a little confused to which way the driver is supposed to be mounted.
Putting the driver with the magnet inside the chamber makes the chamber volume a bit smaller, while enlarging the horn area in front of the driver. Both effects by themselves (more so combined) mean that the low frequency output is decreased a bit, while the sensitivty and maximum output are increased. Putting the driver with the magnet in the horn path makes the frequency response a bit rougher but gives more low frequency output (or at least the appearance).
The original idea behind that possibility, was that Cubo 15 is supposed to be suited to almost any 15" (bass/midbass) driver out there. Low Qes/Qts driver ussually prefer a smaller chamber whilst medium Qes/Qts drivers like a bit more chamber volume.
Regards
Cubo15
I love the simple design and I just happen to have 8 B&C 15PZB40's looking for some bass duty. Can you show a plot of a single and of a group of 4? Also if I was to build them as a 2 X 15 how would I place them for best coupling? Thanks,
Here is a link to the specs
http://www.bcspeakers.com/PDF/PRD/125.pdf
These are 1 (2,0 pi) and 4 times (0,5 pi) the 15 PZB40 with 700 Wrms each (Cubo 15 extended version):
[img]http://www.hardware-test.de/hornresp/B&C15PZB40.PNG[/img] Note that the peaks will be a bit more flat/ rounder and the low end will be extended (up till 10 Hz lower actually).
Utilizing a 40 Hz high pass (12-24 dB/octave) they could handle a bit more (1000 W a piece should do).
Personally I would make a double version with the mouth's combined with a single panel in between (it could be left away perhaps). I can post some configurations if you'd like. The commercial version will be also available as a double, yet R&D will start within 3 months orso.
Regards
Cubo15
What is the frequency difference between the plan "Cubo 7" and "Cubo 15 fits all"? I pray for a quick response. Thanks
Cubo 15 (= 7, gotta rename that pic ) has been in use for quite some time now and has proven itself in combat, so to speak. Playing around with different horn lengths always measured (only) a tiny improvement in flatting the frequency response whilst highly increasing the difficulty of construction (increasing the amount of angled cuts) and panels. Believe it or not, it took me a few months to come up up with this particular idea, utilising a single panel, no angled or weird cuts, not blocking the magnet vent, allowing for deep drivers, etc. The HR-sims are also quite easily matched with the (more precise configured) AkAbak sims.
The extended version simulates and measures flatter for ~70% of the drivers tested, ussually also found a nicer shaped impedance plot. The other 30% prefers the non-extended form (i.e the Delta Pro 18).
Up till now I have recommended the more complex extended Cubo 15 (with angled cuts) were needed (via mail).
Regards
Cubo15
"Cubo15" wrote:
Cubo 15 (= 7, gotta rename that pic ) has been in use for quite some time now and has proven itself in combat, so to speak. Playing around with different horn lengths always measured (only) a tiny improvement in flatting the frequency response whilst highly increasing the difficulty of construction (increasing the amount of angled cuts) and panels. Believe it or not, it took me a few months to come up up with this particular idea, utilising a single panel, no angled or weird cuts, not blocking the magnet vent, allowing for deep drivers, etc. The HR-sims are also quite easily matched with the (more precise configured) AkAbak sims.
The extended version simulates and measures flatter for ~70% of the drivers tested, ussually also found a nicer shaped impedance plot. The other 30% prefers the non-extended form (i.e the Delta Pro 18).
Up till now I have recommended the more complex extended Cubo 15 (with angled cuts) were needed (via mail).
Regards
Cubo15
Can you, please, send the plan and the extended version?
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build the cube 15 for home. tomorrow will test. woofer is JBL LE14a.could you send me the extended version too?zuma13oh@yahoo.comthank you.
would like the extended version if you got the time sir.
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Can I get the extended version too???
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Thanks 
have build cube 15 for 3 hours. then upgraded to extended version. Ex-d version sound better. a lot of tump-tump. Unfortunately can't do any measurement, but it's VERY easy to build, a lot of low frequency pressure and good throw.thank you for sharing with us your plan.
Glad to hear you like it. I do appreciate any/your feedback.
Best regards
have you ever noticed the difference between the reverse mounting of woofer or the straigh way? I mean the magnet face the mouth of the horn or the throat.
cheers, bitzo
Hi Bitzo,
There is a small difference (in the order of 1 - 2 dB). With the magnet inside the chamber, the chamber is made smaller and thus you'll get a flatter response. With the magnet inside the horn the chamber is made larger and thus you'll get a more peaky response. In Cubo 15 Standard that peak is centered around 63 Hz.
As you might know, most popular music has the maximum intensity around 63 Hz (quite exact). So, though it's less flat it might be percieved as louder or even measured louder with an single frequency SPL-meter.
Best regards
I am not a professional sound guy. This weekend, I started building two CUBO 15s. Today at about 10:25pm, I finally was about to test one inside my house and wow, I am very impressed. Did not think this design would have so much power. I am very impressed with this very nice design. I give it a 10 out of 10. Thank you.P.S. This speaker box was my first that I ever built, but I am so impressed. I really recommend this design. Very simple and fun to build.
Greetings; I have a pair each of these 3 speakers drivers below. I have looked at your Cubo 15 plans and they look great. I was wondering if any of these speakers would work ok loaded in your box? Boxes would be low cut at 40hz with a 3 order Bessel filter and high cut 24db L/R at 100hz. The middle speaker is of course an 18 inch driver so if possible could I have a look at your 18 inch cubo plans? I don't expect rolling thunder from these boxes I just want to have some fun building some boxes and put these available unused drivers to work. Thanks for listing your plans and your point of view on these driverDookietwo2
http://www.peavey.com/products/browse.c ... T%20BW.cfm
http://www.peavey.com/products/browse.c ... T%20BW.cfm
McCauley B1560Fs = 31, HzQms = 8,01Vas = 280, litersXmax = 6,5 mmSd = 890, sq.cmQes = 0,39Re = 6, ohmsLe = 1,6 mHZ = 8, ohmsPe = 400, watts
@ Manuel: That's what I like about this design, you can put in almost any relatively inexpensive driver and expect killer performance. Good to hear it's a fun build.
@Dookie2two: The links don't seem to work properly for me, do you have the 1505-8DT or the 1505KA-8DT ? Both will work but the mechanical power handling will be different. If you're having the first one, I think you're having the same model as Manuel. The second one has lower power handling mechanically. Both will do best in Cubo 15 Extended.
About the 1801-8, I've never tried such a high Qts driver inside Cubo 18 before. I'm unsure how it would sound and how low it would go exactly. It's most likely going to be strong at 50 Hz and upwards. It will perform best in Cubo 18 Standard. Do power it gently at first, to see what's limits are exactly.
The McCauley B1560Fs, well, almost didn't simulated this one (still did though). It's definately going to be the loudest of the three. Cubo 15 Extended is advised.
If you send me your e-mail adress at questionsaboutCubo at gmail.com, I will send the appropiate plans from there.
Best regards
Cubo15
Thanks for the quick reply.
I sent an email to your address.
Dookietwo2
EDIT: Regarding link. Depending on where you are it may be you have to first select your country. Then copy and paste the link in your browser and enter it. It then should load.
"ROMMAN" wrote:
I am not a professional sound guy. This weekend, I started building two CUBO 15s. Today at about 10:25pm, I finally was about to test one inside my house and wow, I am very impressed. Did not think this design would have so much power. I am very impressed with this very nice design. I give it a 10 out of 10. Thank you.P.S. This speaker box was my first that I ever built, but I am so impressed. I really recommend this design. Very simple and fun to build.
Be sure to post some pictures when you get a chance.
What is the max SPL to Cubo15 box with Eminence kappa pro lf speakers? Thanks
Instead of stating a number for the maximum SPL, I'd rather directly compare it to a reflex cabinet to avoid any misunderstanding:
The sensitivity of Cubo 15 Extended loaded with the Kappa Pro 15 LF is 102 dB/2.83V/m as opposed to 98 dB/2.83V/m for the Kappa Pro 15 LF in a regular reflex cabinet (150 liter tuned to 44 Hz). Or in terms of excursion the reflex needs 1,65 times the excursion to reach the same SPL as Cubo 15 does.
Best regards
Cubo15
"Cubo15" wrote:
Umjesto navodeći broj za maksimalni SPL, ja bih radije izravno usporediti ga refleks vlade kako bi se izbjeglo bilo nesporazuma]
Now things are much clearer. Thank you very much
What is this cubo 18 i hear of? Plans?
In time there will be plans for Cubo 18 on the web, till then it's mainly done by e-mail. Up till now it's basically Cubo 15 made 3 cm deeper, so that an 18" will fit on the baffle 
In fact I like to give it more time to develop into more then just Cubo 15 for 18" drivers.
At the moment I'm borrowing 12" drivers all over the place (Dutch fora) for the development of Cubo 12. By 2011 I will release Cubo 18, either as it is or developped, by then the Cubo familly will have 5 members.
Best regards
Cubo
Hi. I am a mobile DJ and have built many cabinets in my career. I have reciently built the punisher II and love the sound you get from a folded horn. But it was too heavy for me to lug around up stairs to gigs. I have a Peavey Pro 15LF Driver. The parameters are VAS 331.6, Qts 0.425, Xmax 2.5, Cms 324.6, Qms 3.576, Le 0.74. Can I use your cabinet with this woofer?
To be sure of the suitability I would need Fs and preferably Re. Based upon the T/S-parameters so far I would think Cubo 15 Standard is the most likely candidate. However as you say you're a mobile DJ, it's likely you would find it's short coming on excursion capabilities. A Xmax of 2,5 mm isn't much. Cubo 15 will get more bass out of this speaker then a reflex would but above 200-300 Watt it's meeting it's limits or exceeding them.
I.e. The Ciare 12.00 SW used in the Punisher has almost 3 times more displacement then this woofer.
Best regards
Cubo
The only parameters Peavey gives are:
15"
Impedance: 8 Ohms
Power capacity: 800 W Peak 400 W Program 200 W Continuous
Sensitivity: 96.4 dB / 1 W 1 m
Usable freq. range: 40 Hz ~ 3 kHz
Cone: Kevlar® impregnated cellulose
Voice coil diameter: 2.5" / 63 mm
Voice coil material: 2 layers, thermally bonded copper wire Kapton former Nomex® stiffener
Net weight lb. / kg: 10.4 lbs. / 4.7 kg
Znom (ohms) 8
Revc (ohms) 6.00
Sd (Square Meters) 0.0855
BL (T/M) 13.35
Fo (Hz) 34.4
Vas (liters) 331.6
Cms (uM/N) 324.6
Mms (gm) 66.5
Qms 3.576
Qes 0.482
Qts 0.425
Xmax (mm) 2.5
Le (mH) 0.74
SPL (1W 1m) 96.4
No (%) 2.40%
Vd (cu. in. / ml) 26.1 / 428
Pmax (Watts pgm.) 500
Disp (cu. in. / ml) 131.40 / 2154
So what you are saying is because of the limited excursion I could not run it above 200 watt? That would work. I only do small to medium sized weddings. Unfortuntally I cannot return this woofer and do not want to see it go to waste. Just looking for a light weight cabinet than can produce decent bass.
I just finished testing this box, loaded with kappa 600wLF, I am very happy with it, for such a small box, it was very easy to make. I am going to make 3 more, to be going on with. Thanks for the design.
Hi Jeff,
Simulation of the Peavey indicates that it will have a low mechanical power handling as suggested. I suppose it could be used with a low pass at 40 -50 Hz (18 dB/octave or more). Simulation also revealed that it will be a 50 Hz and up bin, instead of 40 Hz and up, like regular speakers in Cubo 15. As Peavey doesn't show any Xmech figures I would personally start feeding it 150 Wrms, with ~45 Hz, 4th order high pass and see how much more it can take.
If you're ever only going to load Cubo 15 with the Peavey, you could get away with using ply in the order of Yellow Pine (Grenen/vuren in Dutch). Use preferably 7-ply or more. Together with the Peavey this should get you a true light weight Cubo 15.
@Soundjon: Good to hear you like it. The Kappa 15LF was the first speaker used in this cabinet and I still like to use it. Personally I think 4 times Cubo 15 loaded with that speaker will be the foundation for a very decent rig.
Best regards
Cubo15
any build pics guys.........
Well I took some advice from everyone and exchanged that Peavey 15lf for an Eminence 15" Driver. I am going to build the Cubo15 this weekend. I'll post pictures of the build when its done. Do you think stretch form non-backed carpet on the curved inside portion of the cabinet will affect anything? I am carpeting the entire cabinet black.
Sorry not the curved part I meant the visible area behing the grill....
I'm not familiar with the specific carpet you mentioned. In general Cubo is very forgiving in design. If you're glueing the carpet all over to the inside (no flapping around) and it's not too thick, little harm can be done. The carpet however might act as dampning, reducing higher order harmonics (distortion). This can be percieved as both bad or good. You could always rougly paint it black inside or be the first to carpet it.
Best regards
Cubo15
Do you have this design with standard us measurements for the cutsheet? Also do you have a more detailed assembly process.
Just finished building 2 of these yesterday. I have to say that I am very impressed with the sound that these bad boys put out!! My neighbor from across the street came over and asked me to turn them down since I was rattling his windows. Great stuff Cubo! I was wondering if narrowing the design by 2" would effect the sound output much? Thanks again for all of your help.
@bedrat: Have been meaning to do this for a while now. If you can give me the thickness of the material (generally used), closest to 18 mm thick ply, with an accuracy down to at least 1/25th of an inch (or better), I'll convert it for you.
A more detailed approach to building Cubo 15 is easy too write down, so I don't see any trouble in that. Either send me an e-mail at questionsaboutCubo, @, gmail.com or let me know to where I should send it.
For both it's likely that if you react on Saturday or Sunday morning, it will be done on Monday.
@Joe: That's good to hear. Rattling windows is always a good thing, especially over greater distance
Those 2" of narrowing it down, could that have to do anything with standard truck/van pack size, by any chance? Anyways, I ussually recommend people to use the 15 mm plans for such an adjustment, as the horn is actually a bit larger then Cubo made from 18 mm. You will loose some output below 70 Hz but not enough to loose any sleep over it.
Best regards
Cubo
Thinkign of using a McCauley 15" speaker model number 6244 or a TAD 1603 15". Any thoughts on this.
The McCauley 6244 is a good speaker, with decent performance. Do you have any T/S-parameters for the TAD, I couldn't find any.
Best regards
Cubo15
I finished building mine last weekend. It sounds great. I used an Eminence Beta15 driver instead of my Peavey driver and I am happy I did. I carpeted it and installed cab corners on it. It takes everything my QSC 850 can throw at it and wants more. I cant wait to use it a my next gig. I will post pictures of it soon. Thanks Cubo
Nice to hear you like it, I think the Beta 15 is an interesting choice, not really suited for bass in a "normal design". I think I speak for all of us when I say, we'll be interested in any pics of the build or finished product.
Best regards
Cubo15
+1
Thanks guys. My camera is dead, im getting a new one this week. I had a small budget to work with and this driver had the closest parameters to the kappa I could find for the money. I probably will replace it with the kappa in the future, but in the mean time I adjusted my crossover to run this cab from around 60hz to 200hz and my mains run from 200hz and up. It does bottom out below 50hz so I thought it safe to run it a little bit higher untill it breaks in or I get a better driver. It does give me that little something extra I was missing from my mains.
Hi.I'm a DJ now starting out in the Island of Trinidad. and I do a lot of DIY work. Can you please send me the plans for the cubo 15? it's exactly what i need in terms of portabilityThanks!
**edit. now noticed the plans as attachments.* 
cheers
You're not the first one not to notice
Also an email is always easy if you're not sure if you intended driver is suited for the design and which version to build.
Best regards
Cubo15
What are HornResp input parameters for this design? I'm interested in using this driver (or its smaller 12" cousin), and I'm just curious how it appears in HornResp to some of the other designs I've seen (including a few of my own  ).
For the 12" I suggest you wait until Cubo 12 is released, unless you're in a hurry. Also, unless it's some high Qts driver, Cubo 12 is more restricted in it's taste for suitable drivers. I expect it's availabilty to be send by private mail (the plans) within a month orso. The official release on this site depends on more factors, partially beyond my reach, so that's hard to say.
Best regards
Cubo
Oh, for that other part/question of your post, please send a mail.
Best regards
Cubo
do have any idea if a JBL 2226H would work well with the cubo 15?specs here:http://www.usspeaker.com/JBL%202226h-1.htm
Yes it does in Cubo 15 Extended.
Best regards
Cubo15
Hi Cubo,
I was wondering if there`s a maximum number of these cabs I can build? In the long term I`d like 12 or maybe 18 of them, I really like the portabilility of them (back not so good with old age).
Also is there any benefit to different stacking arrangements of multiple cabs?
At the moment mine is loaded with Kappa LF, and I use a 40hz high pass filter, and cross over to my mid tops at about 90hz. I like the sound but I`m wondering if there`s a better driver you know about that will go a few hz lower.
again, thanks for the design
John
Let me think about that for a while (in the mean time build as many as you'd need). However if you build a stack of 6 or more you're hereby ordered to post a pic, unless your build quality is really crappy.
There isn't a driver that will get you any real lower response. However you could V-plate 2 cabinets in order to make Cubo 15 go lower. A stack of 4 x Cubo 15, V-plated, 2 by 2 (two high) will get you response near 30 Hz. It's recommended to use a driver with a higher excursion capability in such case (around 9 mm stated by the manufacturer would generally do it).
Nowaday's quite a few neodymium 15's excist that should be better for your back then the Kappa 15LF while performing better aswell.
Best regards
Cubo15
by CCU (guest) Hi i would really like the Cubo 15, 15 extendet and 18 plans. they look like just the think i need. could you email them to casperunnerup@hotmail.comps i', a dane so i would prefer the plans with the metrik systemCheers Casper
Here some pics from Tim in the Netherlands who is building 4 at the moment.
Build:
Uploaded with ImageShack.us
Results:
Dolly:
Best regards
Cubo 15
Hi Cubo,
I have just obtained two Omega Pro 15 drivers, one needs reconing, which is being done at the moment, the other is fine. Would they work well with the Cubo 15 cab?
Best
ajcsound
Hi Andrew,
The Omega Pro 15 will work well in both Cubo 15 Standard and Cubo 15 Extended, still Extended is advised. Good luck with reconing, that Cubo 15 may prevent the need to recone ever again
Best regards
Cubo
Hello Cozy pillow your pics are great and very usfull. I have a few questions tho,1. Where did you get those handles from i think there great.2. What crosover/plug unit is that on the back of the units it looks interesting.cheers
Hi Nick sorry I could not get back to you earlier. These handles are excellent. they are from Adam Hall. The Cross overs are eminence PXB range but they have stopped making these I believe. The only reason I used these is bacause I will be selling these on to a friend. I don't use passive crossovers normally as they don't work as well as an active crossover. I will have a Behringer Cx2310 for sale probably in early July if you are interested P.M. me?
I have some handles also if you are interested? they are a 2 peice handle with the insert acting as an air tight seal. I had to use a 146mm hole saw to cut the shape needed to make it fit perfectly. Then I routered the shape of the outer handle and rebated the wood by the depth of the handle.
Hope this helps,
Hi there cheers for that it's Great. I actually already have that active crossover the only reason I asked about he passive ones is because I'm a mobile Dj and I was thinking about fitting the passive ones as well just in case my active crossover breaks lol cheers tho.
I will post some pics up when I build my cubos but I can't decide do I build the 15s or the18s what's better can any body help.
Cheers
Cubo 15 and 18 act in a similar way when it comes to performance. Obviously the larger Sd of the 18" gives it SPL advantages if the excursion capabilities are equal. This SPL advantage is spread out between the lower and upper peaks in the response. These peaks are still of the same hight as Cubo 15. In other words: Cubo 18 goes up to a dB, perhaps one-and-a-half dB louder as Cubo 15 but the low and high end response is very, if not similar.
My personal choice would be based upon power compression figures and exact T/S-parameters. An 18" might look better on simulations but if the 18" has a 3" VC whereas the 15" has a 4,5" VC the 15" is likely to produce a higher sustained SPLmax. In the end it depends largely on what driver you're going to use.
Best regards
Cubo
Hi cubo uve recently sent me all the plans and cutsheets. On the cutsheet there are 4 new pieces of wood can you please tell me what these are for. Cheers
Not sure what pieces you do mean but I guess. If they're small and marked red on the cut list. They're to outline the bracings on:
2 x 18.3 cm for the two small triangular bracings and 2 x 28.3 cm for the large triangular bracing in the middle.
Best regards
Cubo
Yeah there the pieces I was confused about . So where abouts do they fit on the plan because I can't see them. Cheers sorry to be a pain I just want to get them exactly perfect.
Sorry for the late reply (vacation started), you can cut them from the left overs. As, even with cut sheet, not everyone cuts the same it's hard to say where to best cut them from other then to make them as wide as possible. I ussually bet on the "missing piece" of 41 cm long and 6 cm wide, down under the 2 other pieces of those dimensions, or the baffle cut out.
Regards
Cubo
Ok cheers so once ive cut them out where exactly do i install them inside the cubo 15 because i cant see these pieces on the plans or any speaker pictures.cheers
I think you might be meaning the braces that go above the speaker against the front panel. I used the ends of the pieces that form the side panels that make the grill mount. I placed them about 20mm either side of the tee nuts at the front of the speaker cut out hole. See the picture link below.
because the end of these narrow panels are already mitred they fit perfectly agaist the front panel and to the speaker mount panel. you then have more bracing for the top panel to stop rattle.
http://img685.imageshack.us/img685/9884/cubo1513.jpg
If you need any more info I will help as much as I can.
Cheers.
by pyroibw (guest) i want to build this box but am unsure witch woofer to use. the 3015lf or the 15lf. there about the same in price, but witch will produce more output?
hello. im about to begin building 2 of these for a small upstart system in manchester and i have a question. what do you recon to using eminence Delta 15A LFs instead of the kappas? (money is an issue but if its gona make a big difference ill go with the kappas)
also i don't suppose anyone could recommend some plans for some tops to go with a pair of these babies??
cheers
rob.p
This cabinet is so versatile that almost any driver will work but,,,, the length of the horn panel may need to be altered. If you pm the designer he will tell you wheather you require the extended version or the standard.
I built 2 Cubo 18 cabs with with DeltaPro18A's and they are amazing. I also built 2 Cubo 15 cabs with Kappa 15LFA's and they are also amazing. There is a very slight difference in SPL between the 18's and the 15's but, it really is not that noticeable. Both these cabs have an unbelievable throw and sound quality compared to standard reflex cabs.
You won't be disappointed!!!!!!!!!
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the 3015lf or the 15lf
They’re both equipped with a 3” VC, almost same gap depth, similar Fs/Qts/Vas. I fit comes to displacing air my money is on the 3015LF, but apperently it lost some power handling capabilities in the proces. Eminence keeps power compression number hidden, so it’s a hard guess. I reccon they’re about even as long as they’re not getting much above 800-900 Watts program. The 3015LF might handles ome more RQ though, or a lower HP.
What do you think of the speaker RCF S800? Nice speaker. Not the cutting edge but an definate upgrade looked upon from the Kappa 15LF. Needs a 40 Hz HP at 24 dB/octave in my opinion though.
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what do you recon to using eminence Delta 15A LFs instead of the kappas? (money is an issue but if its gona make a big difference ill go with the kappas)
If money is a real issue I reccon the Delta’s will work fine. If however, we’re talking about working that one extra day, to afford the Kappa 15LF’s I would think twice;)
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also i don't suppose anyone could recommend some plans for some tops to go with a pair of these babies??
Loads of plans that do a solid 80-90 Hz will do fine.
Regards
Cubo
Anyone has the input parameters for the cubo 15?
check the cubo12 thread I posted the akabak script easy tunable for cubo15 extended version...you have only to change angles, panel slenght, external dimensions, con earea and cone volume.
Here's some pics of my Cubo 15 build. Thanks to Cubo, Martin and Nate for the help. I'm am impressed at the cabinets and it was a fun project!!
Very nice work. I am about to start a build with a pair myself, using the Omega Pro 15A and the extended version. Will post picks once the build starts.
Hi Mate
How would the Eminence Lab 15 work in this, has a massive xmax
LAB15
SPECIFICATION
Nominal Basket Diameter 15", 381.0mm
Nominal Impedance* 6 ohms
Power Rating
Watts 600W
Music Program 1200W
Resonance 28Hz
Usable Frequency Range 20Hz-125Hz
Sensitivity*** 88.5
Magnet Weight 160 oz.
Gap Height 0.375", 9.53mm
Voice Coil Diameter 3.0", 76.2mm
THIELE & SMALL PARAMETERS
Resonant Frequency (fs) 28Hz
Download PDF Spec Sheet
Download PDF Cabinet Design
DC Resistance (Re) 4.9
Coil Inductance (Le) 3.23mH
Mechanical Q (Qms) 5.36
Electromagnetic Q (Qes) .37
Total Q (Qts) .35
Compliance Equivalent Volume (Vas) 103.61 liters / 3.7 cu.ft.
Peak Diaphragm Displacement Volume (Vd) 968cc
Mechanical Compliance of Suspension (Cms) 0.11mm/N
BL Product (BL) 26.7 T-M
Diaphram Mass inc. Airload (Mms) 308 grams
Efficiency Bandwidth Product (EBP) 75
Maximum Linear Excursion (Xmax) 11.8mm
Surface Area of Cone (Sd) 823.7 cm2
Maximum Mechanical Limit (Xlim) 22mm
This was from Cubo a few months back regarding the Lab15
Hi Nate,
The Lab15 is an un-usual driver, thus I've no experience which such driver in practice. The best option would be to use Cubo 15 Extended.
Simulations with the Lab15 indicate that it's perhaps even more in place with an "extended" Extended Cubo 15, meaning the horn is made another 12 inches longer at a constant 555cm^2 area. If you're interested in buidling such a device I can send an picture to clarify this.
Best regards
Cubo15
Thanks Nate. I'm impressed with the sound of these boxes. I'll be looking for your pics. Have fun.. I know I had a blast building these.
Steve
Thanks Nate, i didnt think it would be suited but had to ask the Q
No problem, glad I could help.
hi guys, as iv mentioned in earlyer posts im building a pair of these with emminance dleta 15 lfs. There 500w and i was wondering what kind of aplification people might recomend. Im on a budget and was looking at a beringer eurotrack epq2000. (or somename like that) any thorts?
Well your drivers will be 8ohms, so you need an amp that can do 500w or more at 8r. I really do think you'll replace the deltas later, so maybe need more power.
I would go for http://www.thomann.de/gb/t-amp_ta2400.htm
Plenty for now, much for later. Three years warranty as well.
You COULD use both the Deltas off one side and your mid tops off the other with a nice cheap crossover.
If you fancy s/h then look for a Matrix STR2000/UKP2100
Rob
The Delta 15lf has a small x-max at 4.8mm but is Xmech is surprisingly large at 16.5mm
So it would probably take a fair amount of power before the driver is damaged.
I would say that the Behringer Ep4000 is a far better amplifier than the Ep2000, and would deliver 550W per driver compared with 350W for the Ep2000.
It is important to use a decent hi-pass filter to avoid bottoming out the driver with sub-bass. In fact the sub-bass filter is probably more important than the actual amount of power that your amplifier can deliver.
I did a quick sim on diaphragm displacement for the delta LF.
This shows the speaker driven at 120w and reaching x max at 70hz note how the displacement increases below 40hz. Driven with 550w the displacement at 70hz is still below x-mech but the speaker needs a hi-pass filter to stop excessive displacement below 40hz
cheers for the replies guys but let me make sure i understand correctly.
the active crossover that i will be using as a high pass filer at 25Hz but if i understand your simulation then even that will not prevent my speakers from blowing up if powered much beyond 300W.
????
i must say im a little confused. i had assumed that a 500W speaker should be powered by a 500W amp, excuse my if that seems a novice statement but really im a bit lost
Hai cubo, and all bass lover.
I m from Malaysia. and I do a lot of DIY work. Can you please send me the plans for the cubo 15? it's exactly what i need in terms of portability.Many search on google but cannot have surely link.Sorry my bad english.Hope you sent me a cutsheet detail plans.Sent to:
This e-mail address is being protected from spambots. You need JavaScript enabled to view it
Thnk,
"rob.parkinson" wrote:
cheers for the replies guys but let me make sure i understand correctly.
the active crossover that i will be using as a high pass filer at 25Hz but if i understand your simulation then even that will not prevent my speakers from blowing up if powered much beyond 300W.
????
i must say im a little confused. i had assumed that a 500W speaker should be powered by a 500W amp, excuse my if that seems a novice statement but really im a bit lost
Firstly the Berry 4000 amp, thats cool for you too.
Secondly, 25hz HPF, this is probably the limitation of your crossover??
You have chosen a very cheap driver so will have to compromise somewhere, you need to HPF at 38/40.
Best investment for you right now is a Behringer DCX2496. You will keep this forever.
500w driver and an amp of more than 500w maybe OK in a reflex designed as such, you are using it in a tougher enviroment.
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i must say im a little confused. i had assumed that a 500W speaker should be powered by a 500W amp, excuse my if that seems a novice statement but really im a bit lost
The power handling stated is the electrical power handling, how much power the driver can take without frying. The mechanical power handling is related to the Xmax and Xmech. Usually the Xmax is used to derive this. A speaker with 10000 Watts of powerhandling and 1 mm Xmax is about as useful as a 1 W speaker with 10000 mm Xmax. More expensive drivers will therefore have both increased Xmax and power handling.
In your case the driver will be mechanically limited before it's electrically limited (at low frequencies).
@Musa: Has been send to you.
Regards Cubo
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