Size: 62x62x62cm

Frequency: From 40 Hz up to 110 Hz

Enclosure Type: Hybrid

Recommended DriverKappalite-3015lfKappapro-15lf-2kappa-15lf or  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" realizes 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 hybrids aiming at the achievements as stated above.  The measurement below shows the gain over the stated bass reflex (see * for details). Cubo 15 plans are also available in an Imperial version, plan available on request.

Versions: As a rule of thumb:

Qts x Vas > 120, Cubo Standard
Qts x Vas = 100 - 120, Cubo Extended or Standard
Qts x Vas < 100, Cubo Extended
Qts x Vas < 50; Cubo 15 Extra Extended

Footnotes:* 18Sound 18LW1400 in a 175 liter bass reflex 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.

Designer: Cubo15 [view profile]alt

 

Cubo 15 Standard Plan:

Cutsheet (clearly visible after download):

Cubo 15 Extended Plan:

Cubo 15 Extra Extended Plan:

Only the 2 inner horn panels are different from Cubo 15 Extended, all else equal.

 

 



Tommyj1989's Avatar
Tommyj1989 replied the topic: #24602 3 days 13 hours ago
I’m building a cubo 15 sub and a cubo 15 kick please can you tell me the best driver to put in each 

Delta  15Lfc
Delta 15a
Kappa 15Lfa
Kappa 15a

It’s only going to be for home use really but some advice would be great. Thanks 
heathkit's Avatar
heathkit replied the topic: #24598 1 week 3 days ago
Thank you for your quick reply and great advice. I will likely do a 75 - 100 liter ported cabinet with the Faital woofer.

Kind regards,
Richard
Cubo15's Avatar
Cubo15 replied the topic: #24597 1 week 3 days ago
Cubo 15 is not a mid bass cabinet in anyway, it's purely meant as a bass cabinet up to about 100 - 120 Hz. (driver dependent). For home hifi, any of the mentioned 15" drivers in a closed or ported cabinet will work (around 75 - 100 liter tuned to 60 - 70 Hz). This will give you the highest crossover that's unlimited by band pass effects of various other PA oriented designs and around 96 dB/ W/ m.

The only Cubo design that will get close to a 350 Hz crossover is Cubo Kick 12, you would have to close one or several of it's ports to tune it to 60 - 70 Hz though. Sensitivity is typically over 100 dB/ W/m, so if you only have 1 - 10 W available this might make a sensible choice. If power isn't the limiting factor I would look at one of those 15" PA drivers in a closed or ported cabinet though.

Best regards Cubo
heathkit's Avatar
heathkit replied the topic: #24595 1 week 3 days ago
This CUBO 15 design looks good, but doesn't quite cover the range I need to go with my synergy horns. I need to cover from about 60 or 70 up to about 350 where the synergy takes over. Want good dynamics and pretty good efficiency, about 95 or so. This is only for home hifi, not pro sound reinforcement. Would like to use a 15", maybe a FaitalPro 15PR400, Eminence KAPPA LITE 3015LF, or B&C 15PS76. 

Danley Sound Labs makes a similar size synergy horn that is 3 way with 2-10" or 2-12" woofers that port into the horn. I'm not sure I want to try that, not sure the bass quality would be good enough. Thanks in advance for any suggestions.
IDonCarlo's Avatar
IDonCarlo replied the topic: #24591 2 weeks 1 day ago
Where do I download?
Cubo15's Avatar
Cubo15 replied the topic: #24536 2 months 2 weeks ago
In this case I would advise Cubo 15 Extended for the 15NW100, although Extra Extended will also work.
mrdiego's Avatar
mrdiego replied the topic: #24532 2 months 2 weeks ago
so, if I use the B&C 15NW100, would you advise me to build a Cubo 15 Extended anyway?
Cubo15's Avatar
Cubo15 replied the topic: #24514 3 months 5 days ago
That depends, Pine is 500 - 650 kg/m3 also depending on shipment, manufacturer specifics and humidity. So for roughly an entire sheet of 18 mm ply --> 0.018 x 1.22 x 2.44 x density = 26 - 35 kg. As a reference Baltic is 650 - 750 kg/m3. If available I would also consider Meranti ply.

Cubo 15 Extra Extended is a safe bet as per rule of thumb, it will also work in Cubo 15 Extended though. If you're going for a high power driver like the 15NW100 and will sooner or later upgrade to a heavier amplifier I would consider using 15 mm Baltic birch (quality B/BB). Better safe then sorry.

Best regards Cubo
mrdiego's Avatar
mrdiego replied the topic: #24512 3 months 1 week ago
using 18mm wood, for example pine, how much could it weigh?

If I use B&C woofers, do I have to mount them in an extra extended cubo15? For example, the B&C 15NW100 has:
qts = 0.22
vas = 139dm3 (l)
So Qts x Vas = 30.58
Thank you
Cubo15's Avatar
Cubo15 replied the topic: #24510 3 months 1 week ago
There are plans available for Cubo 15 from 15 mm ply but in that case 11-ply Baltic birch becomes the only sensible choice. Alternatively you can use an 18 mm ply that has a lower density as Baltic birch (spruce, pine, poplar, etc.), these will be lower toughness as Baltic but will be as light as a Cubo made from 15 mm Baltic birch. Send me an e-mail at questionsaboutcubo at gmail dot com for the plans.

As for suitable drivers:

- B&C 15NW100 and 15TBX100
- RCF L15P400 and LF15G401
- 18Sound 15LW1400
- Faital Pro 15HP1020
- Celestion FTR15-4080 (there's like four different versions that are all suitable)

The B&C and 18Sound drivers are a t the upper end of your budget but really worth it if you're going to upgrade your amplifier in the future. The RCF drivers are older models but look like great value for money within you budget.

Best regards Cubo
mrdiego's Avatar
mrdiego replied the topic: #24509 3 months 2 weeks ago
eminence, , Eighteensound, rcf, celestion, maybe Beyma, B&C Are the brands that i can find in Italy. I would like to spend around € 200-250. Even something more powerful might be fine. In the future I could change amps. Also, would it be possible to build a 15 cube with 15mm wood? so it would be lighter, but I don't know how it might sound. Thank you Cubo15
Cubo15's Avatar
Cubo15 replied the topic: #24505 3 months 2 weeks ago
The KAPPA PRO-15LFC is a good choice for Cubo 15 Extended with about 600 W of amplifier power, if you use a 40 Hz high pass filter. To recommend any other driver I need to know your approximate budget and what brands are available to you/ your location.

Best regards Cubo
mrdiego's Avatar
mrdiego replied the topic: #24504 3 months 2 weeks ago
I want to build a cube15. I would like to use a 4ohm woofer and about 600w, as I already own the amplifier. which one could I use? with which cube 15? would the KAPPA PRO-15LFC go well with an extended cube? can you recommend anything else?
biggins's Avatar
biggins replied the topic: #24467 6 months 3 weeks ago
Hi Cubo, 

I have a quick question. Is it OK to mix the extended versions of the Cubo 15 with the original, non-extended version. 

My assumption is that it is not OK to mix designs as the extra horn length will cause issues with the phase alignment but just wanted to check.

Ps: thank you for your kick and sub designs. We have been using them South Australia and they have been sounding great  <3  For a picture of your designs in-situ, check the banner on my stalkbook page.

https://www.facebook.com/2ndClassSleeper/
Cubo15's Avatar
Cubo15 replied the topic: #24466 6 months 3 weeks ago
Well, you can always build Cubo 15 Extra Extended if you feel like it ;)
yanng22's Avatar
yanng22 replied the topic: #24465 6 months 3 weeks ago
Hi Cubo
My Kappa is an old version , the Qts x Vas =52.6 , ( the LF2 as 59.6).
That's why I hesitate , 52.6 is near the limit between the extra extended and extended plan.

Best regards
Cubo15's Avatar
Cubo15 replied the topic: #24457 7 months 1 week ago
@Yanng22: I've calculated Qts x Vas as 59.6 for the Kappa Pro 15LF so I would advise to build Cubo 15 Extended and not Extra Extended.

@ Steve k: If the angles between panels are not shown in the plan you can assume they have a 90 degree difference. The angle between the first horn panel and the baffle is 87 degrees, although if you use an expanding or filling glue type (like polyurethane or epoxy), you can get away with a 90 degree angle as the difference is less than one millimeter.

Best regards Cubo
Steve k's Avatar
Steve k replied the topic: #24456 7 months 1 week ago
Hi Cubo. Just embarking on a extended build. What angle is the extra piece set at in relation to the panel that mounts the driver? Many thanks Steve K
yanng22's Avatar
yanng22 replied the topic: #24455 7 months 2 weeks ago
Hi cuboFor a Kappa pro 15LF QTS x VAS = 52.3I hesitate between the extended and the extra extended.Best regards
Cubo15's Avatar
Cubo15 replied the topic: #24408 10 months 1 week ago
Hi Geritas,

The JBL 2226H is a good driver both for Cubo 15 Extended and Cubo Kick 15.

Best regards Cubo
geritas's Avatar
geritas replied the topic: #24407 10 months 1 week ago
Hi Cubo15 ,  is the JBL 2226H a good driver for the cubo15, cubo15 Extended,  cubo kick or with one for this driver?
Thanks in advance.
Cubo15's Avatar
Cubo15 replied the topic: #24375 1 year 1 month ago
A 909 kicksound peaks at 63 Hz and is -10 dB at 180 Hz and 30 Hz, so Cubo Kick 15 looks to be the best choice here.

Best regards Cubo
redtag's Avatar
redtag replied the topic: #24371 1 year 1 month ago
Actually I use them mostly home and for some raggae/dub parties and pure techno. But if I listen on psy.. I want more 909 kicksound. 
Cubo15's Avatar
Cubo15 replied the topic: #24370 1 year 2 months ago
It really depends on your needs, one Cubo Kick 15 on one Cubo 15 is usable for Live music where there isn't much sub content to cover. For DJ's two Cubo 15 for every Cubo Kick 15 often balances out. Cubo Kick 12 by the way reaches the same sensitivity eventually, it just steps in from a higher frequency, missing the lowest bit of the kick, in exchange it reaches higher.

Best regards Cubo
redtag's Avatar
redtag replied the topic: #24367 1 year 2 months ago
Ok :p I want more kick for my setup as showen before. What should I build? 2 cubo 12 kick? Any suggestions? And what driver? Cubo 15 would be to much for single Cubo 15 extended?