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: 3 days 2 hours 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 days 17 hours ago by t.geessounds #21864
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just finish 2
thanks
Cubo
Posted: 5 days 17 hours 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: 5 days 17 hours 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: 5 days 21 hours 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: 5 days 23 hours 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: 1 week 1 day 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: 1 week 3 days 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: 1 week 3 days 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
Posted: 1 week 4 days ago by Eiser #21837
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Cubo15 wrote:
If you look at the T/S-parameters and such data of the 3015LF and the Kappa 15LF, you will notice that they're pretty much the same, which means they're pretty much the same, except the aluminum chassis and the neo magnet.

Interesting. This favours the Kappa 15LF, since it's much cheaper.

One parameter i stumbled upon though, was the xmax - doesn't it make a difference that the Kappa 15LF has 5,5mm vs 9,6mm on the Kappalite?
Or will it require that you use an amplifier that exceeds the physical limit of the Kappa 15LF before the extra xmax becomes beneficial?

You can leave that bracing out in the Extended version but please put some bracing against that front panel (two pieces, with the same distance between them as the small triangular bracings).

Will do that! I guess the 41x6cm panel can be cut up and used as these 2 braces :) While we're on it, where should I mount the small triangular braces? Something like 1/4 inside, measured from the side towards the middle? Hope it makes sense :)

And thanks a lot for your help.

Can't wait to hear how this awesome design sounds!
Posted: 1 week 4 days ago by Cubo15 #21835
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If you look at the T/S-parameters and such data of the 3015LF and the Kappa 15LF, you will notice that they're pretty much the same, which means they're pretty much the same, except the aluminum chassis and the neo magnet.

You can leave that bracing out in the Extended version but please put some bracing against that front panel (two pieces, with the same distance between them as the small triangular bracings).

Best regards

Cubo
Posted: 1 week 5 days ago by Eiser #21833
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Question is just if the Kappalite is noticeably better...
Posted: 1 week 5 days ago by COZY PILLOW #21832
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The Kappa 15LFA works very well in this cab but if you can afford it use a better driver?
Posted: 1 week 6 days ago by Eiser #21830
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About to start building my first Cubo15, and I'm really excited about it!

Still not sure which driver to use - standing between the Kappa 15LFA and Kappalite 3015LF

Will the Kappalite 3015LF, besides being a lot lighter, perform significantly better than the cheaper Kappa 15LFA?

Also, will the extended version be the best for the 3015LF?

Have looked through most of the thread, but can't seem to find a clear answer on this one, so sorry if it's already been answered!

Thanks a lot :)

EDIT: Yet another question: Is the part marked with blue (bracing under the top plate) necessary in the extended version? Of the builds I've seen here, it seems like a lot of people have left it out....

[File Attachment: Cubo15ExtSk.png]
Posted: 1 week 6 days ago by Cubo15 #21826
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Does that mean the 15xb IS the better driver?

Yes, no, depends. If you made the Cubo 15 out of paper mache or some low grade ply, you might not even bother. Same goes if you don't have the extra amplifier power available and whether you've decent processing or not. It's definately an upgrade tho.

According to the pdf's they both have the bolts at 14.56"

Best regards

Cubo
Posted: 2 weeks 3 days ago by mini-mad #21824
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Anyone.... i ask as i have a party in two weeks and if the stud pattern is the same and its a heavy'er bass i'll buy a pair....
Posted: 2 weeks 5 days ago by mini-mad #21823
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Does that mean the 15xb IS the better driver? I have the 15LFs and looked unto upgrades.... do they have the same stud pattern?
Posted: 2 weeks 6 days ago by t.geessounds #21821
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thanks for the reply sir
but i dont think i have ever seen the plan for the extra extended..magnet inside the chamber is like your profile pic right??
thanks
Posted: 2 weeks 6 days ago by Cubo15 #21820
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In general or between the 15LF and the 15XB? If in general, there isn't a best driver out there, if there was I would keep it a secret and sneaky sell completed Cubo 15's with that driver, I would probably call my secret alter-ego KidCreole or something.

If specific: The 15XB has an aluminum chassis, a 4" instead of a 3" voice coil, better excursion parameters, higher motor strenght, etc. This will also give you more options if you ever decide to build something else.

Best regards

Cubo
Posted: 2 weeks 6 days ago by SchematicSounds #21819
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What driver is the best for Cubo15? I am on a bit of a budget but quality over quantity :)
Posted: 3 weeks 47 minutes ago by Cubo15 #21816
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@T.geessounds: The Extended version for those drivers. You could also use the Extra Extended but Extended with the magnet inside the chamber would be my first bet.

@SchematicSounds: I think you'll be hard pressed to find the Kappa 15LF to be more towards kick frequencies than the 15XB. The Cubo-design pre-shapes the frequency response to make very different drivers perform similary. However, as I hear you're on a bit of a budget, and I rather have you end up with the Fane 15XB, as it's a bit more "classy" than the 15LF, I will lie and tell you that the 15LF does indeed focus more on the kick and you're better of with the Fane 15XB anyways ;)

By the way, my own Cubo 15 uses the 15LF.

Best regards

Cubo
Posted: 3 weeks 1 hour ago by SchematicSounds #21815
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Thinking about building these subs with Kappa 15LF however I thought the Kappa 15LF was more for kick frequencies?

What about Fane 15XB?
Posted: 3 weeks 2 days ago by t.geessounds #21808
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good day sir
am looke to build 2 cubo 15 for the dayton which version i need
www.parts-express.com/dayton-audio-pa385...-4-vc-8-ohm--295-040
thanks B)
Posted: 3 weeks 4 days ago by Cubo15 #21799
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It will definately work, I've done similar things while building Cubo prototypes. I will do so in the future but the future in my case is best unspoken of untill it is there. I will give you credit though, it's a good idea. I do advise to use 15 or 18 mm Baltic Birch for the adapting Ring (pun intended).

Best regards

Cubo.
Posted: 1 month 9 hours ago by crossed #21776
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While working on my two new Cubo18's this weekend I had a thought. Since the Cubo15 and Cubo18 dimensions are so similar, would there be any drawbacks to just use the same plan for both and then make an adapter to fit a 15" speaker in the 18" hole?

Build the Cubo18 as normal, then just cut out a circular piece of wood that mounts to the 18" screw holes with new screw holes and cutout for the 15" speaker. This way, it would be one plan to rule them all.