Frequency: From 40 Hz up to 110 Hz

Enclosure Type: Hybrid

Size: 62x62x62cm

Recommended Driver: icon Kappalite-3015lf (668.37 kB)icon Kappapro-15lf-2 (534.42 kB) and icon kappa-15lf (566.56 kB), drivers with EBP of 100 or higher; Fs (27-50 Hz), Qts (0.21 - 0.41), Vas (150 - 300 L) / (7.4 - 11.1 ft^3). Where EBP = Fs / Qts (strictly speaking it's Fs / Qes)


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).

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 (27-50 Hz), Qts (0.21 - 0.41), 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 This email address is being protected from spambots. You need JavaScript enabled to view it.         *** 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]alt

 

Plan:

Cutsheet (clearly visible after download):

 

 


Posted: 5 days 5 hours ago by Cubo15 #22712
Cubo15's Avatar
The 15B450 is an excellent driver both for 12V rigs as medium power (socket) rigs. You could use it with the magnet inside the chamber for maximum sensitivity (and still go lower as a Cubo 12).

Best regards

Cubo
Posted: 6 days 7 hours ago by dj-dulux #22709
dj-dulux's Avatar
Hi,

I am looking at drivers for my 12V rig and have come across the Oberton 15B450, the EBH is 158 so looks OK I think, any thoughts?

Simon...
Posted: 2 weeks 3 days ago by Cubo15 #22695
Cubo15's Avatar
You know, I would be lying if I said I saw the words sensitivity and frequency response in those sentences, so how do you?.

I see how to calculate sensitivity from those figures but it forces me to the conclusion that as long as sensitivity is between 90,3 - 104 dB/W/m, it will be fine. That kinda redirects me into the thinking that the words sensitivity and frequency response aren't in those sentences because they don't !@#$% matter.

Yes, the JBL E140 is usable in Cubo 15 Extra Extended up to a couple 100 Watts it's a good choice.

Best regards

Cubo
Posted: 2 weeks 4 days ago by urup #22691
urup's Avatar
Recommended in your plans footnotes " drivers with EBP of 100 or higher; Fs (27-50 Hz), Qts (0.21 - 0.41), Vas (150 - 300 L) / (7.4 - 11.1 ft^3). Where EBP = Fs / Qts (strictly speaking it's Fs / Qes)"
Posted: 3 weeks 4 days ago by Cubo15 #22675
Cubo15's Avatar
Sensitivity, Frequency Response are both above what is recomended
Recommended by whom?

Best regards

Cubo
Posted: 4 weeks 6 hours ago by urup #22671
urup's Avatar
Hello, i have been looking for building 2 Cubo 15, to use for a outdoor festivalsspeaker for this years Roskilde Festival.
And i was wondering if i can use JBL E 140-8 drivers instead of kappa drivers (www.usspeaker.com/jbl%20e140-1.htm) Will these be suitable?
Sensitivity, Frequency Response are both above what is recomended.
Thanks in advance :)
Posted: 1 month 3 weeks ago by Cubo15 #22623
Cubo15's Avatar
The 15TBX100 (heck of a driver) will work best in Cubo 15 Extra Extended. To get the plans send me an e-mail (to questionsaboutcubo.at.gmail.com)

Best regards

Cubo
Posted: 1 month 3 weeks ago by Morte #22621
Morte's Avatar
Will it work with the B&C 15TBX100 ?
Posted: 1 month 3 weeks ago by Cubo15 #22615
Cubo15's Avatar
@ Ip8124: For Cubo 15 a higher resonance frequency is better, the lowest reproduced frequency is more or less the characteristic of the cabinet, not the driver.

You can upload pictures to a hosting site like this one or use attachments from the message board itself.

@ Homebrew: n case you're using screws clamps are not needed. Screws 4.0 x 40 mm, pre-drill with a 2.5 - 3 mm drill. At least 5 cm from the edges. Use normal wood glue or poly urethane wood adhesive. Mount the drivers with bolts and t-nuts, mount/ drill before assembling the cabinet.

Best regards

Cubo
Posted: 1 month 4 weeks ago by homebrew #22609
homebrew's Avatar
I am about to embark on my first cubo 15 extended build (2 off) and would
greatly appreciate any tips regarding screws, glue, clamping etc etc. I am reasonably confident I can make a decision went job of these excellent cabs but would love to hear from the experts :-) I intend using them for a band !!!
Posted: 2 months 23 hours ago by lp8124 #22604
lp8124's Avatar
i had 4 JBL2226 and 4 Beyma 15G450N drivers, the beyma has a little more Watts than the JBL but in the end i choose the JBL2226 because its resonance freq is 5hz lower than the beyma. And the JBL has a bigger Xmax than the Beyma. i found the missing info on the forum, so tonight they will be finished. if anyone can tell me how to upload the photos on this page i will upload them this night! :D
Posted: 2 months 1 day ago by lp8124 #22603
lp8124's Avatar
hi, i allmost finished today 4 cubo extended cabs. i am looking for a way to upload the photos here. so you guys can see how nice they have become. to finish the cabs i am waiting on a mail from Johan. with the last info the boxes should be finished befor this weekend! :D
Posted: 2 months 3 days ago by Cubo15 #22601
Cubo15's Avatar
To me the ad on Ebay looks a bit dodgy but Harrison labs has been around for years selling those "passive in-line crossovers", (called Fmod's, there's quite a few). As long as it's "in-line" making a passive high pass isn't very complicated nor expensive, you could even make an active in-line high pass (though more complicated) using a tool in WinISD Pro (a6 or a7 I think).

People probably thought you were talking about an passive high pass after the amplifier, those get crazy expensive real quick as they need to withstand a lot of power. In-line crossovers (before the amplifier) typically get a few Volts (and low associated current) through them.

Another slightly more expensive option would be www.miniDSP.com, a cheap 2x4 programmable sound processor.

Best regards

Cubo
Posted: 2 months 1 week ago by DjMattiB #22600
DjMattiB's Avatar
Zaxder

Im not sure what kind of equipment you have, but I have build in high and low pass filters in my EQ that run in my rig. I've never had a problem and with having the EQ I can adjust for the room or event I'm playing.

Just my 2 cents,
Dj Matti B
Posted: 2 months 1 week ago by zaxder #22594
zaxder's Avatar
Thanks for taking your time to answer my question.

Indeed I have been looking for a high pass filter, but I can't seem to find any. On different forums, people tend to explain, that it would be expensive to make/buy a high pass filter, and the only high pass filter I have been able to find, looks a bit dodgy to me.. I'm talking about filters like this: tinyurl.com/oq74k23

Can you recommend a filter that would do the job bearing in mind that the setup is for festival purposes and therefore needs to be relatively inexpensive?

Much appreciated
Posted: 2 months 1 week ago by Cubo15 #22592
Cubo15's Avatar
Looking at your setup I think you're going to be allright without a high pass but I can't guarantee it. You can put the chance in your favour by avoiding feedback (i.e. from turntables) and making sure that the music doesn't contain any (wanted or non-wanted) very low frequency content. Still, would look for a high pass in the future as it gets you more bass.

Best regards

Cubo
Posted: 2 months 2 weeks ago by zaxder #22565
zaxder's Avatar
Hi.
I have recently built a Cubo 15, which is my first speaker build, but I'm a bit worried about the filtering.

I'm using the Pioneer GMD-8604 to power my Cubo 15 loaded with Kappa 15LFA, as well as to power my tops. It delivers about 300 watts to the cubo, but here is my problem. I only have the option of either using a HPF OR a LPF to filter it. Of course I chose to use a LPF at around 115 Hz, but my concern is, if the Cubo is able to handle all the low frequencies, which I can't filter? ¨

Am I alright without a HPF, or what do I do?

Ps. It's for a festival setup :-)
Posted: 3 months 2 weeks ago by Cubo15 #22514
Cubo15's Avatar
I've got one Cubo 15 here with the exact same color scheme. What driver is in there?

Best regards

Cubo
Posted: 3 months 3 weeks ago by Watson #22509
Watson's Avatar
Just finished my first Cubo 15 ext. I'm going to add the bracing at the mouth after doing some router work on the braces.

imgur.com/S4czcaY,cDS1oW6,pAd91JI#0
Posted: 3 months 3 weeks ago by bgrade #22502
bgrade's Avatar
If you right click on the image, you should be able to "save image as" to your hard drive. Alternately you can open image in another window or tab and you can zoom. (At least that works for me on my comp using Chrome)

edit: oops never mind. Missed the final page where it was already sorted by maestro Cubo. :)
Posted: 3 months 3 weeks ago by zkralj88 #22501
zkralj88's Avatar
Hi!

Believe me, live drums and bass also go to overkill on a more then few occasions! :)

Could you be so kind as to send me an extra extended plans?

Thank you for your help!

Cheers

Zoran
Posted: 3 months 3 weeks ago by Cubo15 #22500
Cubo15's Avatar
@Zoran: The 18PZB100 in Extended would be my first choice but then again that would be a bit overkill and perhaps more suited for heavy drum and bass nights, etc.

The 15PZB100 in Extended or better Extra Extended is a good choice. It's got a 4" VC versus a 3" VC for the Kappa, so higher power handling and lower power compression. A very good driver for your requirements, a single Cubo 15 Extra Extended loaded with a 500 - 1000 W amplifier would do.

As an estimate: 18PZB100; 35 - 100 Hz, 15PZB100; 40 - 100 Hz.

@Robbie: Done.

Best regards

Cubo
Posted: 3 months 3 weeks ago by robbie4448 #22497
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Having trouble downloading the blue prints . can u e-mail them to me in standard.Thanks. This email address is being protected from spambots. You need JavaScript enabled to view it.
Posted: 3 months 4 weeks ago by zkralj88 #22492
zkralj88's Avatar
Hi Cubo!

Can you please tell me how would B&C 15PZB100 fit in the cubo design?

www.bcspeakers.com/products/lf-driver/15-0/15pzb100

If it's usable which would be better, regular or extended, and how is it against Kappa Pro LF2?
It would be used by a live band in a small venues up to 100 peeps max under a 300W mid top,
with all of the band and speaker DSP processing required.

Also 18PZB100, for the cubo18?

www.bcspeakers.com/products/lf-driver/18-0/18pzb100

Thanks a lot!

Cheers

Zoran
Posted: 4 months 3 weeks ago by Cubo15 #22396
Cubo15's Avatar
20 mm off the allround dimensions turns a 238.4 liter cabinet into a 216 liter cabinet, that's close to 10% difference. I once made a Cubo at 57 cm allround dimensions and didn't like it, like the original. Reducing only the width of the cabinet has more favourable outcome. I even know of people that have reduced the width to 50 cm (and they seem happy with the results).

Best regards

Cubo