Frequency: From 40 Hz up to 110 Hz

Enclosure Type: Hybrid

Size: 62x62x62cm

Recommended Driver: pdf  Kappalite-3015lf (668.37 kB) pdf  Kappapro-15lf-2 (534.42 kB)  and pdf  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



Cutsheet (clearly visible after download):



Posted: 3 weeks 10 hours ago by Cubo15 #22969
Cubo15's Avatar
The 15-300/8A is suitable for 40 - 100 Hz, in Cubo 15 Extended, with an average of 101 dB/W/m in most of it's working range. It's limited to a ~300 W amplifier. Great driver for 12 V PA systems or small systems, little low EBP though.
For a standard system I would advise the Eminence Kappa 15 LF or the Fane 15-600LF. For 12 V PA it's a good low budget choice.

Best regards

Posted: 4 weeks 1 day ago by Elnufo #22943
Elnufo's Avatar
Hello Mr. Cubo, i would love to know if this Driver will work in any of the Cubo 15`s and if so:
Normal, Extended or Extra Extended? Magnet in Chamber or in Horn?
How much Power could it take when highpassed @ 40Hz 18dB/oct. ?
What would the Sensitivity be like?
What would the lowest reproducible Frequency be like?

Driver: The Box Speaker 15-300/8-A

Fs: 52.6Hz
Qms: 14.00
Qes: 0.67
Qts: 0.64
Rms: 2.5kg/s
Cms: 0.09mm/N
Mms: 105.5g
BxL: 17.3 N/A
SPL: 95.2 dB
Vas: 100.3 L
Re: 5.4 Ohms
Le: 1.2mH


Thanks in advance :)

please excuse my bad english ;)
Posted: 2 months 4 days ago by deemarko #22881
deemarko's Avatar
Sorry, my fault. Everything ok :)
Posted: 2 months 4 days ago by deemarko #22880
deemarko's Avatar

I can't find download link :/
Posted: 2 months 5 days ago by Cubo15 #22879
Cubo15's Avatar
Haven't seen an e-mail with your name on it (or the 2226 lately). That's a good driver for Cubo 15 Extended.

Best regards

Posted: 2 months 1 week ago by Shortrope #22862
Shortrope's Avatar
Which version would you recommend for this driver?
I can't seem to get you on email.
Posted: 4 months 1 day ago by doller #22776
doller's Avatar
I have just made 4x cubo 15's kappa pro 15lf2. I have been using 4x labs with 4xhd 15's very happy with that setup however, the clubs that I play are all in basements. Luggin labs down right angled stairs has become a real bind. Also labs work great outside or in big rooms but not so much in small clubs. Unless you are in the toilet that is. most bass there I think. I was looking for something smaller that wasn't so much long throw. But will go low. Well the cubo seemed the one. first test I wasn't so happy (always like that hey) lost alot of kick and as most of the gigs I do are djs so, really need kick. want kick. Urrrm. ? what to do. ? I want to make some cubo kicks but don't have the time for the next 2 gigs. So, I dragged out 6x mth 30's . Have seen a guy in oz using them for kicks. started out 4 way sub kick mid tweet. got lot's of combing. used endless settings no joy. gave up on the 4 way went 3 way cubos and mth on the same band off a driverack. Wow! crossed them all up to 140hz. Kick returned with vengence. I am really against using two subs designs together. usually doesn't work atall. This is a great combo. Psy trance punches just right. One of those strange things that just works maybe.. You do need to stack em rite not mouth to mouth. This has made the cubo's sound great real punchy. taken away the woof tightened up nice. Magnet in mouth by the way. so crossed 33.5hz to 140hz. bang on sound.
So mr cubo thank you very very much. Today I am a happy man. Will get on the cubo kicks soon. would like to hear how they sound.. top guy.
Posted: 4 months 3 weeks ago by lp8124 #22730
Posted: 4 months 3 weeks ago by lp8124 #22728
lp8124's Avatar
Hello, i just finished 2 cubo KICKS and 4 cubo extra extended.
would like to upload the pictures here but still dont know how...
Posted: 5 months 3 days 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

Posted: 5 months 4 days ago by dj-dulux #22709
dj-dulux's Avatar

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?

Posted: 5 months 2 weeks 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

Posted: 5 months 2 weeks 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: 5 months 3 weeks ago by Cubo15 #22675
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Sensitivity, Frequency Response are both above what is recomended
Recommended by whom?

Best regards

Posted: 5 months 3 weeks 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 ( Will these be suitable?
Sensitivity, Frequency Response are both above what is recomended.
Thanks in advance :)
Posted: 6 months 2 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

Best regards

Posted: 6 months 3 weeks ago by Morte #22621
Morte's Avatar
Will it work with the B&C 15TBX100 ?
Posted: 6 months 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

Posted: 6 months 3 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: 6 months 4 weeks 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: 6 months 4 weeks 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: 7 months 1 day 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, a cheap 2x4 programmable sound processor.

Best regards

Posted: 7 months 1 week ago by DjMattiB #22600
DjMattiB's Avatar

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: 7 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:

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: 7 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