Free Speaker Plans

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: 2 weeks 3 days ago by Cubo15 #22116
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A 62 cm wide, 62 cm deep and X cm high would be fantastic!
Send me an e-mail at This email address is being protected from spambots. You need JavaScript enabled to view it. and I'll help you from there.

Best regards

Cubo
Posted: 2 weeks 5 days ago by DjMattiB #22106
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I too am interested in a Cubo Kick!! Id prefer the smaller version you were discribing Mr Cubo!! Thanks in advance and for everything you have done for us!!!!!

P.s. I did send you an email asking about this as well. :silly:
Posted: 2 weeks 5 days ago by easy my youth #22105
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Looking for cubo 15 kick plan. Repeat cubo 15 KICK, google search doesn't turn up any info. Thanxx !
Posted: 3 weeks 6 days ago by bjm362 #22070
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Great Pics BEE! Very clear !
Posted: 3 weeks 6 days ago by bee #22068
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they sit at the back of the cab, as a brace...



Posted: 3 weeks 6 days ago by vesthardt #22067
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I must be missing something. How am i supposed to know where to put the triangular pieces in the cab? Sorry for the lame question :p
Posted: 1 month 3 days ago by Cubo15 #22040
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Typical, I design a kick-bin that's (HxWxD) 62 x 62 x 62 cm and one that's 45 x 45 x 50 cm and you want one that's X x 62 x 62 cm's ;)

I managed to make the last version look neat as well, so send me an e-mail @ questionsaboutcubo.at.gmail.com and we'll take it from there. Wait a few months and perhaps a member of this forum has build and tested one.

Best regards

Cubo
Posted: 1 month 6 days ago by KTO #22031
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Cubo15 wrote:
If you're either looking for a kick cabinet the exact same size as a Cubo 15 or pretty much the same size as a Cubo 12, I'll probably be able to help you. If you´re looking for a kick cabinet that is 62 cm wide, 62 cm deep and X cm high, I might be able to help you.

Best regards

Cubo

A 62 cm wide, 62 cm deep and X cm high would be fantastic!
Posted: 1 month 1 week ago by Cubo15 #22027
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If you're either looking for a kick cabinet the exact same size as a Cubo 15 or pretty much the same size as a Cubo 12, I'll probably be able to help you. If you´re looking for a kick cabinet that is 62 cm wide, 62 cm deep and X cm high, I might be able to help you.

Best regards

Cubo
Posted: 1 month 1 week ago by KTO #22014
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Cubo15 wrote:
@Mini-Mad: Kick is covered by 80 - 300 Hz, so a Cubo 15 covers only a small fraction of the kick, hence you might be looking at the wrong place.

Is it possible to design a small kick bin the same footprint of the cubo15 that would sit atop it nicely? Possibly a HD15 placed on it's side?
Posted: 2 months 1 week ago by Cubo15 #21939
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@Mini-Mad: Kick is covered by 80 - 300 Hz, so a Cubo 15 covers only a small fraction of the kick, hence you might be looking at the wrong place. That being said, strong output @ 118 - 125 Hz will emphasize kick to the chest, which in most cases would mean EQ your tops 3 - 5 dB or so. A high EBP, low Qts driver, with medium Vas driver would also emphasize the lower kick frequencies.

@Cees: It's a good driver and all T/S-parameters are fine, except Xmax (which is tiny) and would limit power handling to 200 - 300 W. It would be a great candidate however for a kick-bin or a top cabinet.

@Johan: I've got good experiences with the Kappa 15LF, however the Fane looks to be (a fraction of) a fraction better.

Best regards

Cubo
Posted: 2 months 2 weeks ago by johangastorp #21917
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Kappa 15lf or fane sovereign PRO 15-600lf for the extended Box? Same price on the driveris.

Best regards Johan
Posted: 2 months 3 weeks ago by cvbaudio #21902
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Dear Cubo

I'm new at the forum

I have 4 P-AUDIO SN15MB

MID BASS WOOFER
Size (in.) 15.0
Power RMS (Watts) 300
Fs (Hz) 47.0
Xmax (mm) 3.5
Sensitivity 1w/1m (dB) 100
Qts 0.26
Vas (lt) 176.75

I would like to use them in the cubo 15
Is this good choice ?
Posted: 2 months 3 weeks ago by mini-mad #21900
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Thank you dear sir. And thank you again for such a great design!

Quick question.... is there a way to EQ a little kick into this box?
Posted: 2 months 3 weeks ago by Cubo15 #21872
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As it's quite an efficient driver it wouldn't be a waste. Just make sure you either use it in Cubo 15 Extended, with the magnet inside the chamber (not in the horn) or in Cubo 15 Extra Extended (e-mail me at questionsaboutcubo(at)gmail.com for the plan).

@t.geessounds and mini-mad: Well done, those look like textbook examples.

Best regards

Cubo
Posted: 2 months 3 weeks ago by xqzme #21870
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Hello Cubo

I love your design, and I really hope that I soon get my own made, but theres a problme!

I bought some badass units (i think at least!), because I got a offer I could not refuse.
At first glance I thought they looked perfect for the Cubo, but then I saw that the Vas is too low.... and I can't really assess what it effects, and which impact it will make, now that the rest of the specifications fit ...

Would it be a waste, to make 2 x cubo15 out these drivers?

RCF L15P540:
8 Ω
Program Power:1000 W AES
Power handling capacity:500 W AES
Sensitivity:98 dB
Frequency Range:40 Hz ÷ 2000 Hz
Effective Piston Diameter:330 / 13 mm/inch
Max Excursion Before Damage (peak to peak):36 / 1.4 mm/inch
Minimum Impedance:6.8 Ω
Voice Coil Diameter:76 / 3 mm/inch
Resonance frequency:50 Hz
DC resistance:5.6Ω
Mechanical factor:9.7
Electrical factor:0.41
Total factor:0.39
BL Factor:21.4 T · m
Effective Moving Mass:106 g
Equivalent Cas air load:100 liters
Effettive piston area:0.085 m²
Max. linear excursion (mathematical):6.5 mm
Voice - coil inductance @ 1kHz:1.5 mH
Half-space efficiency:2.94%

Full specs in the attachment
Posted: 3 months 2 days ago by mini-mad #21865
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Here are 2 of my 4 boxes... kappa LF loaded. I had them built for my daughters 18th and i ha e to say they sounded brilliant, even just two of them!!

Thanks again Mr Cubo!!
Posted: 3 months 3 days ago by t.geessounds #21864
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just finish 2
thanks
Cubo
Posted: 3 months 5 days ago by mini-mad #21862
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Thank you again.... i always look forward to reading your posts on here as your a very helpful man and have a vast knowlegde wen it comes to your boxes and driver. Again, i cant thank you enough!

I'll get a set of 15XS's as my matrix amp does 4x 1200 @4ohm... so maybe i'll get the 4ohm versions (not bothered about resale prices)
Posted: 3 months 5 days ago by Cubo15 #21861
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How much power do you have available? If you can give this driver 1000 - 1500 W and high pass it lowish, yes, this is the driver for you. It would be more subby.
This is what I tell you based upon my personal experience.
Seriously I'm looking in the pdf's just like you could ;)
This is what I tell you in a response to:
the reason i ask you is that you prob have the baskests knocking around to know the answer to this.... i know you said the stud pattern was the same for the kappa LFpro as with the fane 15XB.... would the 15XS also be the same

Best regards
Posted: 3 months 5 days ago by mini-mad #21860
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I understand the paper work but im asking what your EARs tell you as i have paper work that says my car can do 127mph... but it never will...
So im asking your judgement and im very happy to hear the verdict. Thank you
Posted: 3 months 5 days ago by Cubo15 #21859
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How much power do you have available? If you can give this driver 1000 - 1500 W and high pass it lowish, yes, this is the driver for you. It would be more subby. Seriously I'm looking in the pdf's just like you could ;)

Best regards

Cubo
Posted: 3 months 1 week ago by mini-mad #21848
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Mr Cubo... 1st of all thank yoooooooooooooooooooooooooooou!

i have 4 of these bad boys and do like their sound. i know i already asked a similar question and the reason i ask you is that you prob have the baskests knocking around to know the answer to this.... i know you said the stud pattern was the same for the kappa LFpro as with the fane 15XB.... would the 15XS also be the same and would this be a good driver and more "subby" then the LFpro's? the kappas do a good job but i want to cut down from 4 boxes down to 2 and load with a pair of kick ass drivers without having to build two more boxes for new drivers (while selling my 4x kappa loaded boxes.

thanks in advance if you do know the answer to any of my questions.
Posted: 3 months 1 week ago by Eiser #21842
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Interesting!

I guess I'll take the Kappa 15LFA then :)

Thanks a lot for your help!
Posted: 3 months 1 week ago by Cubo15 #21840
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If you look at all the T/S-parameters, the difference in Xmax is kind of a mystery, as these drivers should be the same. My preliminary conclusion is that the Kappa 15LF and the KappaLite have the same gap depth and voice coil winding height, it's just that Xmax at 10% THD is likely measured for the 3015LF and the Kappa 15LF Xmax was probably measured less favourable, or mathematically derived, while they're likely still the exact same.

I place the small triangular bracing at 1/3 the width, though 1/4 would also do.

Best regards

Cubo