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

Magnet orientation:

The driver mounted with the magnet visible (the magnet in the horn) typicall gives the lowest bass response and slightly better cooling of the voice coil. Mount the driver with the magnet inside the chamber for most output around 60 - 80 Hz or the highest possible crossover frequency.

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.

 

 

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Cubo15's Avatar
Cubo15 replied the topic: #25036 3 months 1 week ago
That depends on the clearance in front of the drivers and the excursion they make. To make sure that the accordion surrounds of the two drivers can not touch each other you might want to use a spacer ring between the drivers. I.e. an 18 mm MDF ring between the drivers doesn't hurt the outcome but might not be needed.
Buje's Avatar
Buje replied the topic: #25033 3 months 2 weeks ago
Thank you, I have 4 Ev 15 dl 400, to test, the location, front to front, do you need any modification for this?
Cubo15's Avatar
Cubo15 replied the topic: #25030 3 months 3 weeks ago
It is, however a single driver with double the power handling will work just as well.
Buje's Avatar
Buje replied the topic: #25029 3 months 3 weeks ago
Cubo 15 isobaric is posible? thanks
Cubo15's Avatar
Cubo15 replied the topic: #25008 10 months 1 week ago
The high pass is good, I know that some Cuboteers cross Cubo 15 at 120 Hz or higher but I prefer 80 - 100 Hz myself, so I can't personally recommend it. The Turbosound tcx115b looks like a good choice, it won't be as loud as a Cubo 15 but it works better with the amplifier/ processing that you've got. So unless you're able to use additional EQ on the Cubo 15 (to suppress 100 - 150 Hz), I think the Turbosound tcx115 is a good choice. Best regards Cubo
savior's Avatar
savior replied the topic: #25007 10 months 1 week ago
thanks cube, my problem is that I would use his original amplifier which has the cuts already set and not settable!
you say they won't do?
the amp delivers 550watt, the cut is from 38hz to 120hz.
however in the diagram I may see that the cut is at 40hz 12db.
I'm ignorant of technical data! i have manufacturing experience with cnc machines, but i have always built cabinets and heads for guitar amps designed by others.
do you think maybe a bandpass like the turbosound tcx115b would be better, which as a frequency range is very similar to my sw540 sub? 
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Cubo15's Avatar
Cubo15 replied the topic: #25006 10 months 2 weeks ago
Those are actually pretty good drivers, I would use them in Cubo 15 Extended or Extra Extended up to about 80 - 100 Hz. The only thing lacking is the Xmax, I would use a high pass at 40 Hz and use about 500 W of amplifier power per driver.

Cubo
savior's Avatar
savior replied the topic: #25005 10 months 2 weeks ago
hi cube, i'm savior from italy. i have a problem with 2 sub montarbo sw540. in practice they have the plastic cabinet and too small, so these subs sound the same way both front and back! I was thinking of building two new cabinets and came across the cube 15 project.
the features of my sw540 sub are:
MOSFET amplifier (class AB)
Max. Output power 550 watts continuous rms 850 max peak
Frequency Response 38Hz ÷ 120Hz ± 1dB
impedance 4ohms
Stereo electronic crossover 24dB / octave Crossover frequency 120hz

I think the woofer is from B&C but you don't know the model! however i found some specifications of this woofer in the manual.
Nominal diameter 15 "
Frequency range 37 ÷ 2000Hz
Sensitivity 99db
Rated impedance 4 ohms
Net weight 8 kg
FS 37hz
RE 3.04 Ohms
Qms 16.93
Qes 0.35
Qts 0.34
Vas 0.1m3
ηo 3.17%
B.l 16.62 T / m
SD 0.085m2
Xmax ± 5.25mm
 
Cubo15's Avatar
Cubo15 replied the topic: #25003 11 months 2 weeks ago
Both the STX W.38.1200.8.MC and W.38.800.8.MC look good on paper, except one thing, the weight of the drivers doesn't correspond to such T/S-parameters: Normally you wouldn't use the physical weight of a driver to base it's performance on, but since all these drivers have ferrite magnets and from the looks of the photo's also have aluminium baskets, you would expect better overall performance with an increasing physical weight.

The 1508-8 SPS BWX for example, weighs 7.7 kg but it has a high-ish Qes (less magnet needed) and small Xmax (4.7 mm again less magnet needed), so those numbers add up.
The Kappa Pro 15LF, weighs 10 kg, has a medium Qes and Xmax, and a 3" voice coil instead of a 4" voice coil like the Black Widow has. Again those numbers add up.

The STX W.38.1200.8.MC, weighs 7.5 kg, (claims a large voice coil and Xmax, medium Qes) and the T/S-parameters suggest it would would be close in performance to the 15TBX100, however the 15TBX100 (also large voice coil and Xmax, medium Qes) weighs 12.3 kg.

So something is off, as I'm rather safe than sorry, I would exclude the STX drivers from the list.

1) Kappa Pro 15LF
2) Black Widow 1508-8 sps (or the Kappa 15LF, 9 kg but a steel chassis)

Cubo
nemsik's Avatar
nemsik replied the topic: #25001 11 months 2 weeks ago
Hello Oskar,
I have used two "W.38.800.8.MC" from two different series and I think they are quite weak speakers, so I don't know if the "W-38-1200-8-MC" will be much better.
Currently, I have loaded 15TBX100 and the difference is big.
oskarociak's Avatar
oskarociak replied the topic: #25000 11 months 2 weeks ago
Hello Cubo.
Can you judge which of these speakers is best for the cubo 15?
a) Kappa pro 15 lf2
b) Black Widow 1508-8 sps
c) STX W.38.1200.8.MC
Thank you in advance for your answer
Zambrotta's Avatar
Zambrotta replied the topic: #24992 1 year 1 week ago
but the one loaded with the 2226 is the meanest of them all thank you for the design brother
Zambrotta's Avatar
Zambrotta replied the topic: #24991 1 year 1 week ago
ok thank you for your feedback Cubo I already have 3 x Cubo 15 extended two of them loaded with p.audio bm-15w and one with the p.audio p150/2226h and their spl is amazing....
Cubo15's Avatar
Cubo15 replied the topic: #24989 1 year 2 weeks ago
Hi Zambrotta,

That's a good driver for Cubo 15 Extended, only drawback is the short Xmax, therefor a 40 Hz high pass is advised.
Zambrotta's Avatar
Zambrotta replied the topic: #24985 1 year 2 weeks ago
Hello Cubo I would like to try out the Cubo sub 15 but I only have a p.audio p150/2226 15inch driver that one with a blue basket at my disposal what are the chances of it doing well in that cabinet
Cubo15's Avatar
Cubo15 replied the topic: #24980 1 year 1 month ago
Hi,

It's 30 Hz vs 40 Hz. I''d go for Qts below ~0.4 and Xmax over 7 mm, if you elaborate your question, you'll get a more sophisticated answer ;)
Zambrotta's Avatar
Zambrotta replied the topic: #24979 1 year 1 month ago
Hello Cubo how are you...can you shed some light on the difference between the Cubo sub and Cubo 15....also what kind of drivers would work well inside the Cubo sub
Cubo15's Avatar
Cubo15 replied the topic: #24973 1 year 3 months ago
I do like the old 15PS100 over the newer 15PS100, I would place the old version on par with the 15G450N, while the newer version is on the bottom of the list, below the JBL, which in hindsight is a close second to the 15G450N.
nemsik's Avatar
nemsik replied the topic: #24972 1 year 3 months ago
What do you think about B&C 15PS100 in Cubo15 extended?

Unfortunately but I found two different datasheets:
1) www.bcspeakers.com/en/products/lf-driver/15-0/8/15ps100-8 ("new")
2) images.thomann.de/pics/prod/260670_datasheet.pdf ("old")

Please tell me if "both" speakers are good for Cubo? Which will be better?

--edit--
I ask because the "old" 15PS100 has EBP = 100Hz but the "new" has only 82hz. The recommended value for Cubo is 100 or higher. 
The "old" has QTS = 0.31 but "new" has 0.43, where recommended is 0.21 - 0.41
The "old" has VAS = 152 but "new" has only 103, where recommended is 150-300

The "new" 15ps100 is suitable for cubo15?

Thank you
giveortake's Avatar
giveortake replied the topic: #24971 1 year 3 months ago

In the footnotes freespeakerplans.com/plans/14-plans/basscab/44-cubo15 the email has a mistake.


Thanks for this, I have now corrected the email and profile links.
nemsik's Avatar
nemsik replied the topic: #24966 1 year 3 months ago
Thank you, I've emailed to you
In the footnotes freespeakerplans.com/plans/14-plans/basscab/44-cubo15 the email has a mistake.
Cubo15's Avatar
Cubo15 replied the topic: #24965 1 year 3 months ago
questionsaboutcubo at gmail dot com
nemsik's Avatar
nemsik replied the topic: #24964 1 year 3 months ago
Hi, Mr. Cubo
Is your email correct? Unfortunately, I can't send the message to you.
BwoySkanky's Avatar
BwoySkanky replied the topic: #24942 1 year 5 months ago
Bonjour tout le monde, je suis nouveau dans ce topic déjà et ausi dans le monde de la construction heu Autonome de son sound ? je sais pas si ca se dit mais je suis seul sur mon projet ^^, fin bref..

J'aurais quelques tites question désolé, en faite j'ai pour projet de me faire un ''''mini'''' Sound spécialement pour style: Reggae,Steppa,Dub....

Et donc je me renseigne et je tombe sur le mignon Cubo 15 que je ne connaissais mais alors pas du tout et vraiment avec les retours de certains et autres ca ma carrément donner envie faut dire alors voilà, j'ai acheter un HP
the box Speaker 15-300/8-A
Puissance: 300 Watt RMS, 1200 Watt crête
Impédance: 8 Ohm
Réponse en fréquence: 50 - 4000 Hz
j'ai aussi vu que si on utilise du 15" il serais recommander d'utiliser du Multipli bouleau donc je vais chercher ça demain les planches mais en attendant je me demandais quel filtre utiliser pour les basse et a partir de quelle fréquence ?.. merci beaucoup pour votre temps de pri pour me répondre et désolé du roman....

Derniere chose:
Dans l'avenir j'aimerais bien une tite tour comme ceci vous en pensez quoi ?

1 Cubo 15 ext/1 Cubo kick/T2v et par la suite la doublée alors je voit en grand voir trop grand pour comencer et seul en + ? ou est-ce possible d'un coté sachant que le temps et l'argent n'est pas un probleme ha oui sachant que je me suis renseigner sur cette config car ca me parraisser budget Moyen fin bon c'est vous les pro, je suis juste jeune amateur.

VOilà fini désolé encore et merci beaucoup :)
Cubo15's Avatar
Cubo15 replied the topic: #24916 1 year 7 months ago
That's interesting, it's a bit larger than I thought, the difference between Extended and Extra Extended is much smaller, to the point that I wouldn't mention it.

Cubo