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: 5 hours 5 minutes ago by Cubo15 #22353
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That does look good, enough for Cubo Kick aswell ;)

Best regards

Cubo
Posted: 1 day 4 hours ago by anjmoor #22342
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Having Built my Cubo 15's probably 2 years ago I have relented from spending the money to buy good grills for them so imagine my delight when a customer asked me to remove these lovely window grills from their property,, 7 of them :) :)
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Posted: 2 weeks 5 days ago by Cubo15 #22275
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hi how does da 15xb sound inda cubo 15???
I would suspect it to sound similar to the Kappa Pro 15LF but take more power. It's advertised as a warm sounding speaker.
Which way is best to turn the speaker?? Some turns the cone out of the box and some turns it in to the box.
That depends on the listening crowd and the specific driver. As you're the likely listener it couldn't hurt to try both way's and decide which way sounds best to you.

When it comes to the driver, is it too late to talk you out of using the Alpha? I suspect it to work although being (truely) one-note-ish. Also that price seems be at least twice what I would expect to pay over here. That's a lot of money for a driver with a smaller magnet then most passive radiators.
All kidding aside, if you haven't bought it yet, look for a different driver. However if you already have it, I would like to hear your opinion about it's performance, as I've never tested a driver with such a high Qts in any Cubo cabinet.
I got some problems with crossovers. Because i want to make one for my cubo 15
Best thing would be to go active when it comes to the crossover as a passive crossover will cost you output-wise. It also usually allows the use of a high pass filter, that (when picked correctly) will up the output even more. I think the total output could easily be 5 dB or more when using a active crossover (and high pass).

Best regards

Cubo
Posted: 3 weeks 3 days ago by Thecaba100 #22264
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Hello i want to ask you some questions about the Cubo 15.

1. witch way is best to turn the speaker?? Some turns the cone out of the box and some turns it in to the box.

2. I got some problems with crossovers. Because i want to make one for my cubo 15

I am using following link speaker for my cubo :) If you got time for a drawing of how it is put together it would be awesome.

(speaker link) www.elextra.dk/main.aspx?page=article&artno=H19508

Hope you are able to help.
Posted: 4 weeks 2 days ago by Nitesh #22259
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hi how does da 15xb sound inda cubo 15???
Posted: 1 month 1 day ago by Nitesh #22246
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ok coolman ...please let me knw how its sound coz i want to put my 15xbs indat box ...i hope da 15xbs sound better than da scoops ..i lyk this cubo bin its small n its band pass...please let me knw ...thanks man ;)
Posted: 1 month 3 days ago by mini-mad #22238
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Nitesh wrote:
hi..will the fane coloosus 15 xb run wull in this box...

....well i hope as i have two coming to me in the next few days. im replacing my kappa pro LFs. the kappas are good but im hoping the 15XBs will pound harder.
Posted: 1 month 3 days ago by Nitesh #22237
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hi..will the fane coloosus 15 xb run wull in this box...
Posted: 1 month 3 weeks 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: 1 month 3 weeks 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: 1 month 3 weeks 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: 2 months 2 days ago by bjm362 #22070
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Great Pics BEE! Very clear !
Posted: 2 months 2 days ago by bee #22068
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they sit at the back of the cab, as a brace...



Posted: 2 months 2 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: 2 months 1 week 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: 2 months 1 week 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: 2 months 1 week ago by Cubo15 #22027
Cubo15's Avatar
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: 2 months 2 weeks ago by KTO #22014
KTO's Avatar
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: 3 months 2 weeks 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: 3 months 3 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: 3 months 4 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: 3 months 4 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: 3 months 4 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: 3 months 4 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: 4 months 1 week 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!!