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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
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