looks like a good design.
any speaker tested yet?

The 18Sound 18LW1400, Eminence Delta Pro 18 and the Void 18-1000. Other drivers have been mentioned but yet need to be confirmed.

The 18LW1400 and V18-1000 have both been measured in the 3th prototype, the current release however is the 5th protype, the 4th being Cubo 15. The 18LW1400 measured a higher sensitivty then Cubo 15 over the <100 Hz range, crossover around 80 or 90 Hz sounded best.
The V18-1000 haa a tremendous kick. Hearing the kickdrum from an amplified drumset crossed at 125 Hz puts a smile on my face every time.

The Delta Pro is owned by a forummember.

Best regards

Cubo

Delta Pro 18A's work really well in a pair I built for a friend he has been so impressed by them he want's me to build him another 2 as soon as I can.

Hi Cubo. What is the advantage of he extended version?

I found the larger version you did for me the other day (totally forgot, sorry). I have a pair of Fane 18b 600 to use so which do you think, the standard, the extended or the bigger one you did?

Keep up the good work.
Nick

it's been a while since I posted pics so here goes if I make a mess of this could someone point me in the right direction?

oops. i have saved an album in imageshack but I can't remember how to upload it to this thread?

here is the link in the meantime. http://img843.imageshack.us/g/cubo1812.jpg/

ooops again try this link. http://img843.imageshack.us/slideshow/w ... bo1812.jpg

Cubo 18 Extended is an upgrade if you will, that, for most drivers will result in a smoother frequency response. Some drivers however have smoother response in Cubo 18 Standard.

The Fane 18B600 works in both yet is a dB more smoothed in the extended version.

Those drawnings were from Cubo Sub, the 1st prototype IIRC? Soonish I'll be prototyping the 2nd (and 3th) prototype, of which the third is similar to the 1st you got. The 2nd prototype will hopefully be more versatile in placement..

Cubo 18 Extended: 40 Hz and up in 249 liter. Cubo Sub: 30 Hz and up at 1.5 times the size of Cubo 15 (sensitivty on both models is equal on average). Choose your game

Best regards

Cubo

Hi Cubo, is there much difference in SPL with the MAGNET inside the chamber as opposed to outside? I think you have mentioned that the SPL increased with the Magnet Out?

I am guessing that if the cabinet was bigger then the cab could play higher freq's but the output would be lower?

regards, Cozy.

Hi Cubo, what about using p-audio c18-650el.will it work?Hima Vanso

This is my first post here.I have 4 of this in an old keele's W-bin,can i use this in the CUBO 18?Thanks you!

http://www.jblpro.com/pub/obsolete/2240gh.pdf

From a basreflex perspective: The magnet inside the chamber means the chamber is smaller, whcih means a higher tuning. The port on average has a larger surface area and thus a higher tuning.
With the magnet outside the chamber it means a larger chamber with thus a lower tuning. The port looses surface area which results in lower tuning.

From a horn prespective: The magnet inside the horn means a smaller horn volume, thus less effciency but a lower Fc. The chamber is increased which means better low frequency reproduction.
The magnet inside the chamber increases the horn volume (and area in front of the driver), it lowers the chamber volume and thus the low frequency reproduction.

Both the effect on the chamber volume and the port/horn volume are small, together they can just be noticed. With the magnet inside the chamber for maximum output between 50-90 Hz (up to a 1 dB). With the magnet inside the horn the Fc is lowered a full 3 Hz. Some drivers might give a bit more output around the 50 -63 Hz mark 8with the magnet outside the chamber), at the cost of 70 - 100 Hz, suggesting higher output, as usually a lot of output is centered at 63 Hz in most populair music.
If you mean lower frequencies in stead of higher frequencies you're correct. Cubo Sub has equal sensitivty (on average) in comparison with Cubo 15. The Fc is lowered up to 8 - 10 Hz compared to Cubo 15. Excursion is increased on average, to keep the volume of the cabinet to a minimum. Therefore 15" would work but as a rule of thumb an 18" would handle more power mechanically.
There is a very big chance that it will, however: It has many different T/S-parameter sheets floating on the web, some with inconsistant parameters. So it's very hard to do a simulation on it. Luckily Cubo 18 will work with a wide variéty of drivers (from V18-1000 through the 18LW1400 upwards the infamous 18" Kilomax). So there is a goof chance it will do just fine.

Those are not the average loudspeakers T/S-parameters but they should work nicely (Cubo 18 Extended). Very efficient so 600 Watts should get you a long way.

Best regards

Cubo

Thanks Cubo. As usual your answers are brilliant. You are a true credit to this forum.

regards,

Do i need to damp the inside?Thank you very much!

Dampening materials should only be used in the rear chamber, without restricting the air flow to the horn throat. Differences between with, or without dampening materials are usually small in bass cabinets. In the next line of cabinets I will do some subjective testing. usage largely depends on personal preferences imo. Some dampening materials might extend the virtual volume of the chamber (10-15%), lowering overal efficiency a bit in exchange for a bit more low frequency extension.

@Jim: Thanks.

Best regards

Cubo

Thank you very much for the reply!

How should it be wired?Magnet in the box = normal phase?Magnet outside the box = reverse phase?

I use normal wiring for the magnet in the horn. Reversed for the magnet inside the chamber. However I test what sounds best to me for every new model.

Best regards

Cubo

Hey Cubo

Great plans. I gotta say I love the design of the cubo 12, 15 & 18.
Is it possible that you can sim the 18 with the RCF L18P300. I have 4 of them waiting for new homes. I am tired of lugging around double 18s.
Let me know if you think it would be a good fit and if it would sound better in these than in some empty SRX4718 cabs
Thanks a mil

No need to simulate the RCF L18P300, I've no doubt that it will perform well.

The SRX4718 will likely be able to be crossed higher, the Cubo 18 will be louder and looking at the specifications of the SRX4718 it will go just as deep.
I think wether you'll put it in a SRX4718 or Cubo 18 it will sound well.

Best regards

Cubo

Thank you sir.
In the cubo 18, where do you recommend crossing it over at? Im looking for somewhere between the 120 - 150hz

Personally I wouldn't recommend any 18" sub to be crossed higher then 125 Hz. They might excist, I just never heard any that sounded right that high. If you insist on crossing above 120 Hz-ish, I would strongly recommend using a basreflex.

Best crossover frequency for most 18" cabinets is in between 80 and 100 Hz imho. This is however driver dependant as different T/S-parameters (and such) produce different acceptible results.

Best regards

Cubo

hey mr. cubo the guy i build the cubo 15 love it the bass was so nice an deep he cant believe its a 15" playing ...
now am look to build 2 of the cubo18 if the Dayton PA460-8-18" can work as good as the Eminence Delta Pro 18.. i need to know as soon as posible before the sale is gone....thanks
http://www.parts-express.com/pe/showdet ... er=295-036

Buy it.

Best regards

Cubo

I've added the measurements for the third prototype for the 18LW1400 and the V18-1000 vs Cubo 15 and the 18LW1400 in a reflex cabinet as stated per plans. The third prototype is 7.4 liter larger externally and has a slightly different chamber and horn length.

I've posted these measurements as it's not likely I will be building Cubo 18 any time soon.

Best regards

Cubo

but i might so should wait for the nex plan if u think it will play better right???

The plans on the site are the next plans

Best regards

Cubo

Who have Hornresp data of Cubo18 ??

Who have Hornresp data of Cubo18 ??

i just finished a pair of the cubo18 cabs thankyou for the plans. im waiting for the drivers to be delivered im cant wait

Yes, Has anyone HR input data?

nope but...on cubo12 thread there's the akabak script for it so if you change the external dimension the panels lenght and angles too you can sim the cubo18 extended version.

cheers

i am throughly impressed with these cabs ..i kinda went a bit cheap on materials used some sanded pine 3/4 inch ply 28 bux a sheet all in all with the selenium 18sws1100 drivers the build cost me $528.00. they sound amazing in the small venue i do a weekly Dubstep Heavy bass night.. i replaced 2 single 15 br cabs and a 2x12 powered sub with these ..

Hello I am Daniel from Argentina, I say to my question: Well, it while I've come from other music festivals and with my two bass reflex cabs equipped with 2 drivers and 2 woofers eminence alpha 15''bass 150w and 2 boxes of 15 '"with ARLs 250w speaker. The situation is to save enough money I want to change one the largest in Africa and buy two Peavey Low Rider was cheaper and seemed 18PRO hehe well, so I'll go to point I want to know if you do not mind if this box (cube 18) can work with my 2 18''from Peavey and thank you very much:). Greetings. PD: Data from the subwoofer. Features Product: 18 "1808-8 AL CP Pro Rider ® OTC 18" Impedance: 8 Ohms Power: 2400 W 1200 W peak 600 W continuous program Sensitivity: 96.3 dB useful frequency range: 35 Hz ~ 2 kHz Cone: Kevlar ® impregnated cellulose Coil Diameter: 4.0 "/ 100 mm Coil material:. aluminum ribbon wire ex polyamide fiberglass impregnated Nomex ® reinforcement welding diffusion welded OFHC copper leads Net Weight lbs / 18 kg lbs / 8.2 kg Znom (Ohms) 8 Revco (ohms) 5.6 Sd (meters Square) 0126 BL (T / M) 17 928 For (Hz) 36 Vas (liters) 296.54 Cms (UM / N) 0127 mm (g) 142 551 11.14 0.579 Qes 0.551 Qms Qts Xmax (mm) 4.6 Le (mH) .41 SPL (1W 1m) 95.9 n Vd (%) 2.45% (Cubic inches / Ml) 69/1138 Pmax (PGM Watts.) 1200 Disp (Cubic inches / ml) 235/3852

Hello Daniel from Argentina,

The driver you mentioned is suitable for usage in both Cubo Standard and Cubo Extended (the latter advised). Due to llow Xmax for this driver, I would recommend keeping an eye on the excursion after putting more then 300 watts into it with the recommended high pass settings. I think you could consider it an upgrade from your current system.

Best regards

Cubo

Cubo:
Consideing building with either one of these drivers:
Goldwood 18"
http://www.parts-express.com/pe/showdet ... er=290-398
or
Eminence Delta Pro 18A
http://www.parts-express.com/pe/showdet ... er=290-520

Pease advise on which to build and what way to face the driver.

Thanks,

Mike

I would advise the Delta Pro 18A over the Goldwood's, use Cubo 18 Standard for best results, magnet in the horn.

Best regards

Cubo

thank you good sir!

cubo, one more to look at Eminence Sigma Pro 18a-2This or the delta?Thanks,Mike

Totally missed this one:

Personally I always look at the weight if 2 models have similar T/S-parameters. It's not a very scientifically correct comparison but for drivers from the same series and manufacturer, that weight difference definately did go somewhere.

The Sigma and Delta pro are close in performance (Fs/Qts/Vas) but the Sigma has more weight (7.5 lbs more heat wick) due to the 3" vs 2.5" VC. Also Xmech and EBP are slightly higher. Therefore I would say the Delta Pro is best suited for small to medium power, whereas the Sigma Pro for medium power applications.

Best regards

Cubo

For those of you interested, these are the preliminary results for Cubo Sub, Prototype 1, 2 and 3. MIC =Magnet in chamber, MIH = Magnet in horn.

@Micheal Autopsy (your answer is at the previous page).

Best regards

Cubo

Great,

I am looking forward to this,

Thanks

Chendy

hi can the cubo 12' be used in car audio with hi excursion speakers?

Hi Bryan, there is actualy a Cubo 12 thread where you may find the answer to your question here

http://www.freespeakerplans.com/index.p ... 5&start=50

IMO the cubo 12 is a design for a DJ or Band speaker and is not really suitable for a car. But, Mr cubo is very helpful and may be able to steer you in the right direction?

good 1

HI CAN I USED CUBO 18 WITH 18NW100 B&C SPEAKER

Hi Cubo,

Can you please post the frequency response of 'Cubo Sub' designs by themselves, (not relative to BR subs). I am interested in your design, but want to know what its actual output vs frequency is.

Thanks very much for your efforts!

Chendy

Got a Fane XB kicking about, not same as 18b listed earlier.
Worth a go??
Ta

Hi Chendy,

I wish I could and will definately realise this someday (work in progress but slowly) but not yet. On the good side: The 18LW1400 in the 175 Ltr reflex tuned to 37 Hz is relatvely flat between 45 and 110 Hz and inbetween 97-98 dN/W/mtr.

@Nicky: Answered via gmail.

@Nikos: Answered via gmail? If not: Yes, in Cubo 18 Extended on higher power levels.

Best regards

Cubo

Hi Cubo,

Thanks for the response.

How come you have the graphs relative to a BR, but not absolute? Can't you just measure them? (I am just interested)

Also what drivers to you recommend for the Cubo Sub? What drivers would you personally use? I want as low a response as possible, but I am not that interested in higher bass response, as I am going to be using them with lots of HD15's - so 30 Hz to 60 Hz is the range of interest for this sub.

Thanks again,

Chendy

The original idea of comparing directly against an 18" reflex is, that some manufacturers inflate their figures, some don't, some use "tricks", etc. That way it's difficult to "see" on paper what exactly you've got. An 18" reflex is pretty standard, if not standard. Some might do a little more then others but as far as my experiences goes they are all pretty much in the 96 -99 dB/W/m region and 97-98 dB/W/m in the flat working range. This should give an easy reference for most if not all experience levels.
On the other hand, I do most commonly measure indoors, in a fairly large space (450 m'3 / 16,667 cu. ft.) I tried it outdoors but that was quite a hassle. So here I actually need the reflex as a reference, to excite the same room nodes (a blanc).

As I do live in the middle of a city, measure-ing outside would require a large car, a long drive, a generator, nice weather, a friendly smile to alarmed law inforcers (or a permitt). As I said before, working on it, but that smile, its so hard

Personally, for Cubo Sub I would use lowish to medium Qts 18" or 21" drivers (0.20 -0.35). However, if it works in Cubo 18 and most of the times Cubo 15, it will work in Cubo Sub.

When the final measurements appear they will be the usual: 18Sound 18LW1400, Void Acoustics V18-1000, Eminence Kappa 15LF and another yet to be named 18Sound 18" driver. Love to get my hands on a 21". Currently adjusting Cubo 21 plans to fit the PD 2150 (I do the talk, Xoc1 the walk). As soon as I get my hands on a 3015LF I will try that one too, as it sims fairly well (minding it's an lightweight 15").
After measurements I'll be able to make a list.

Best regards

Cubo

Cubo 12 by CarlosWith the magnet inside the chamber of the Cobo 12 can we increase the chamber volume for speaker displacement, and if so how much can we increase it by as far as height is concerned? Your help would be an asset to my project. ThanksCarlos

Hi Carlos,

I'm not entirely sure I correctly understand your question.

An increase in chamber volume will increase sensitivty at the lower end of the response in exchange for an overall lower sensitivty climbing higher as frequency rises up to a maximum of 140 Hz. Increasing the height of the cabinet also increases the horn path length and changes the horn expansion profile. It would be easier to predict performance based upon a given height then to predict a maximum.

Best regards Cubo

I plan to build a pair of Cubo 12 but i like the look of the seeing the speaker cone with the magnet in the chamber, so i would like to enlarge the chamber volume to maintain a lower tuning and better low frequency, my question is, how much will i have to increase the volume and will this work out ok?Thanks, Carlos

Just some added note. With the increse in volume of the Cubo 12 chamber i would want to keep the horn volume the same size. Thanks.

The average 12" driver takes up about 5 liter and holds 1 - 2 liter inside the cone. The chamber therefor will be ~7 liter smaller. Because the horn volume is now 7 liter larger it will influence the result a bit more. leading towards higher efficency and less low bass. Best would be to make the chamber ~10 liter larger (instead of 7 liter) to compensate for this increase. Keeping the horn the same means the cabinet has to be made 6 cm higher or wider or deeper. If you need any help on this let me know per e-mail.

Best regards

Cubo

This info is sweet music to my ears,i will do a full scale drawing and send a sketch off to you for approval. Thank you!

Does anybody knows how much trimite / Warnex structure paint it takes for 2 cabinets?

a guess would be about 3L for 2 coats

Got one of these built, pics later.XB going in, will report back soon.

@Nicky: Ok, sounds like a plan.

@ Apague: I'll second bee's estimate, will paint a Cubo 15-ish shortly. I shall weight the bucket before and after a single structured Warnex coat.

Best regards

Cubo

what will happen if the vas-value of the driver is slightly higher than recommended?is this a bad choice? http://www.billebro.se/myshop/myshop_start.php?APPID=2&PRID=5720please help..

sorry i meant fs-value!!

Good morning, I consulted again .. there have been rumors that the cubo18 not work in outdoor spaces is true?I did not assemble by insecurity, a waste of money assembled for use so that you query again, the new speaker will be an eminence sigma pro 650w 18A-2 is effective outdoors?Ps: I will have twobye and thanks

I have a pair of Cubo 18's with Delta Pro 18's in them and have used them outside and they are very good.

I also have a pair od Cubo 15's with Kappa 15lf's in them and they work well outside the rumors are not true.

Hi Cubo, i'm going to build four to eight of these units. Has anyone tried PD 1850/ 51's with the cubo 18's ? I'm going to use these for dnb/dubstep events so they'd need to drop low, so which design would work best?

Cheers Ben

i think u should try this one...
http://www.freespeakerplans.com/mth-4654.html

Do the rumours state why they're not suitable for outside? I'll second Jim.

Best regards

Cubo

This Cubo cab has to be one of the most versitile cabinets around at the moment. because so many drivers can be used with it and they sound superb with budget or expensive drivers.

I think the rumors come from people who have either never used the cabs or have other motives, which is a shame.

Every member and every new member who will join this forum, build some Cubo's and judge for yourselves. It does not take long to build one or two. IMO you won't find a better cab for the money you will spend.

If the cabs don't work then they were not the cabs for you. Simplez

Sorry, I seem super versatile boxes, Iput hand to work on the construction of them wanted only an opinion of you has more experience.Warm greetings from Argentina ... I appreciate his knowledge, I willposting photos of the boxes very soon!

has anybody tried a PD186 in this box?
thanks

Hi,

The PD186 would work best in Cubo 18 Extended.

In some ways it's a similar driver to the 18LW1400, I would expect it to sound best crossed around 80 - 90 Hz, sound low, a bit "warm/round" and average around 102 dB/W/m.

Best regards

Cubo

what kind of material bump effect did you use to get that nice black textured finish effect in the renders?

@Deny: Can you send an e-mail to questionsaboutcubo[at]gmaildotcom?

Best regards

Cubo

hi, i finished one cubo 18 (not extended with magnet in horn) today.usualY i do not like 18" speakers and i only built it becuse nobody wanted that eminence sigma 18 pro which was laying around here for years. i was offering it for 80euros allready. i built it with 19mm spahnplatte (the cheapest wood you can get) just to test the design. all i have to say is that im very impresd of this box. it still loads deep enough to be used down to 40hz. unfortunatelly i only had a small car hifi amplifier with me (about 80w rms) but even that was fun. the bass doesnt sound good (still better then most 18" reflex) and should be crossed around 90hz. its biggest advantage is the preassure around 50_60hz. so thanks for sharing your really good plans and greetings from germany.

Hi Cubo , FSP ,

Quite new to FSP. I wanted to share my recently finished Cubo18 (std).

Thanks Cubo and FSP. More power from a Philippine member ...

nice build

very nice build and welcome.

how would the cubo18 perform against RCf ESW1018 when using identical speakers?

The ESW1018 is 288 liter, Cubo 18 is 250 liter. Given that they're about the same volume I expect a similar performance as well. Most noticeable difference will likely be the sound and/or transient response. Only after a few reviews in a direct comparison I can say more about that.

Best regards

Cubo

Hi there mr Cubo, what would be the best hi pass freq cut off for the Cubo 18, do you think 30hz is well enough. Apology if you posted it already..Thanks and regard,frad

Hi,i have bayma 21L45 and would be really happy to take the plans for cubo21, wich i couldnt find here, but mr.Cubo mensioned that plans for cubo21 will follow? http://www.beyma.de/fileadmin/seiten/download/pdf/Oldies/21L45.pdf

the plans are hear......

http://www.freespeakerplans.com/cubo-sub.html

@Streetsounds: That depends partially on the specific 18" driver that you're using. If it has an Xmax below ~ 7 mm one way a 40 Hz high pass is still advised. If it's a 9 mm one way (and plus) 18" driver with a Xmech (Xdamage) beyond ~36 mm peak-tot-peak (preferably 50 mm plus) 30 Hz, 24 dB/octave will do unless your playing silly sines all day.

@Dungal: If you send me an e-mail to questionsaboutcubo at gmail dotcom, I will send the plans for Cubo 21 from there. These plans are slightly modified in comparison with Cubo Sub to fit a 21" driver more easily on the baffle. A driver like the Beyma 21L45 will really turn this cabinet in a beasty performer for it's size.
With a 24 dB/octave (or higher) 27 - 30 Hz high pass it will take plenty of power.

Best regards

Cubo

Totally forgot about this one:

Warnex, black:

First layer on untreated Baltic Birch; 360 grams for the outside of a Cubo 15-ish cabinet plus the inside of the handle caps and 6 cm deep inside the horn mouth.
Second layer; 300 gram.

If you order 1 kg per Cubo 15/18 you can do a re-coat after a year orso.

Used roller: http://imageshack.us/photo/my-images/80 ... oller.jpg/

Best regards

Cubo

Hi Mr cubo

How would this sim if used isobaric/compound loaded ? I have four cheap 18 drivers sitting her but only have the room for 2 cubos , just wandering how it would sound as the the bl is doubled. Amp power isn't an issue.

Cheers

I don't think that this would work very well at all.
Which 'cheap drivers' are you talking about? Have you any thiele small parameters for the drivers?

I think the following is right

FS is the same for an iso pair.
QES is the same for an iso pair.
QMS is the same for an iso pair.
QTS is the same for an iso pair.
VAS is one-half for an iso pair.
MMS is doubled for an iso pair [ MMS = 1/(2 * pi() * FS)^2 * CMS ]
CMS is halved for an iso pair [ CMS = VAS / ( 1180 * ( 343^2 ) * SD^2 )
RE is halved for an iso pair.
SD is the same for an iso pair.
Efficiency is 3db less for an iso pair.
EBP is the same for an iso pair.
BL is the same for an iso pair.

Oh ok , just a thought! I was under the assumption that ISO doubles the Bl as u have 2 motors supporting each other , I suppoose it just acts like dvc in many respects. ISO seems work better with "cheap drivers" with poor t/s , not pratical for large event but sound good in small halls/rooms!

What drivers do you have (T/S-parameters if possible) and what is the maximum cabinet size that you can use?

Best regards

Cubo

hello ALL.I WANT TO BUILD A cubo BOXTHE Problem is. he STERT in 40HZ. AND I WANT THE SUB to go Under 20 HZ.Which Modifications i need to do to the box? to go uder 20 HZ.it is for my Living room.the Drivers I have is.RCF L18-p200. cubo 18OR DRIVER DAS G35a cubo 15OR JL AUDIO 12W7 cubo 12Which one will go lower in a cubo box?Sorry on my poor English.eli. my amp is 1000W in 8 ohm. power isnot the Problem.

Currently there are no Cubo designs for 20 Hz performance. However you could easily design a tapped horn for the RCF and JL Audio drivers to do that. With the 18" it will be easier to get a decent sensitivty but the displacement of the 12" is larger which would make it easier to get it down low but likely with a lower sensitivty.

A SPL of 120 dB/W/m (f6 @ 20 Hz) is easily do-able in half space without getting to large (overall size of Cubo Sub), with a single driver. That could work up to 130 dB/W/m, with an f3 @ 20 Hz in 1/8 space.

Best regards

Cubo

Thanks for the response.

But I did not understand what it meant half space.
The RCF is 18 inches. And JL is 12 inches.
Which one will give more power at low frequency.
And had more kick.
I'm looking for a subwoofer will be felt in the chest.
For example: Trance music. Feel the vibrations throughout the body and the couch.

Thank you for your help

20hz in trance? I don't think so.

Maybe some research into actual HZ.

Trance in general sounds best with lots of 63hz IMHO

Cubo. I have Beyma 18G40 drivers. Will the work in the cubo 18's?

I planned to build A CUbo 18 to my bedroom.
But he did not fit the closet . Is too high.
How do I change his measurements. Up to 48 cm depth
Width up to 1 meter. And height to 80 cm.
Priority he can get to the frequency of 30HZ.

This depth with the opening on the front side.
You can help me in planning?

Yes, these drivers work best in Cubo 18 Extended and will take equal or more power as in a reflex design.
http://forum.speakerplans.com/guide-to-winisd-pro-and-hornresp_topic1314_post11070.html#11070 (Under ANG:).
It's often the kick that is felt in the chest, the lowr kick starts at about 80 Hz, going upwards from there.
Regular trance music hasn't much content below 40 Hz. Some samples might dive down to 30 Hz. To feel the music you would need high SPL.

My first bet would be the JL Audio 12" in a largish reflex design tuned low (so that it makes plenty of excursion with lower power levels) and place it nearby your couch. Consider placement in your room, in a corner or against a wall will increase the overall SPL-levels, see link. Ussually there is a bass minimum in the middle of the room, whilst there is an overload of bass near the walls.

Alternatively build a Cubo Sub that is 48 cm wide (so 77 x 77 x 48 cm). It will go down to 30 Hz and interact better with the room gain as the standard Cubo Sub.

Best regards

Cubo

10X for the Response.

if it Possible to get a sketch. Measurements of the bords in the box.

I have several options
RCF L18-P200
RCF L18-P300
CERVIN VEGA STROKER 12 - 1995
CERVIN VEGA STROKER 18 - 1995
the old Woofer.

The JL Not Relevant now.
Which would you choose and why?

What gives the most bass. SPL?

DELETE

Hey there Cubo, firstly thanks for the simple design and effort you have put into this. Im currently getting 2 cubo 18 cut for me and was wondering if you could answer a few questions

1. What saw blade width have you used ? 300 mm ??
2. And the panel thats 47.7 *58.4 is the one with the 17.5 degree angle cut along the longest edge yes ? and also the sheet that holds the driver?
3. the pieces of wood that go around the mouth what is the angle on those , the ones that sit under the panel that supports the driver ?> is it 17.5 again ? heres a pic of what i mean [img]http://desmond.imageshack.us/Himg826/scaled.php?server=826&filename=cubo1820.jpg&xsize=640&ysize=640[/img]
Another question the large triangle support I notice in the construction pics you have had to cut out a notch but its not in the plan ?

a quick answer would be good as Ive paid to get it cut and dont want to make any mistakes.

Regards

Pete

@Soundman: I've moved the answer to the Cubo Sub topic to keep the different topics clear:

http://www.freespeakerplans.com/index.php?option=com_jfusion&Itemid=64&jfile=viewtopic.php&p=15104#p15104

Best regards

Cubo

I've got a flimsy saw blade that is about 2 mm thick and has a 190 mm diameter. Not sure if that answers your question.

The panel that holds the driver (is called the baffle) and is 48.2 cm on the longest side, 47.7 cm on the shortest side. The angle is 17.5 degrees.

The panels around the horn mouth (bracing) I ussually cut with a hand saw. Not to sure how to name the difference in angled cuts between the bracings and the baffle but I think the difference is clear? And yes, that's 17,5 degree in that respect.

Correct, that's not in the plan. I ussually put the entire cabinet together, except one side panel, then put the triangular bracing in place of the side panel, so that you can draw the position of the baffle and inner horn panel(s) on it with a pencil (and cut it out that way).
After that the panel is put in place with the help of some 'distance-blocks".

Best regards

Cubo