Cubo 15

Instead of stating a number for the maximum SPL, I'd rather directly compare it to a reflex cabinet to avoid any misunderstanding:

The sensitivity of Cubo 15 Extended loaded with the Kappa Pro 15 LF is 102 dB/2.83V/m as opposed to 98 dB/2.83V/m for the Kappa Pro 15 LF in a regular reflex cabinet (150 liter tuned to 44 Hz). Or in terms of excursion the reflex needs 1,65 times the excursion to reach the same SPL as Cubo 15 does.

Best regards

Cubo15

Now things are much clearer. Thank you very much smiley20 smiley20 smiley20

What is this cubo 18 i hear of? Plans?

In time there will be plans for Cubo 18 on the web, till then it's mainly done by e-mail. Up till now it's basically Cubo 15 made 3 cm deeper, so that an 18" will fit on the baffle

In fact I like to give it more time to develop into more then just Cubo 15 for 18" drivers.

At the moment I'm borrowing 12" drivers all over the place (Dutch fora) for the development of Cubo 12. By 2011 I will release Cubo 18, either as it is or developped, by then the Cubo familly will have 5 members.

Best regards

Cubo

Hi. I am a mobile DJ and have built many cabinets in my career. I have reciently built the punisher II and love the sound you get from a folded horn. But it was too heavy for me to lug around up stairs to gigs. I have a Peavey Pro 15LF Driver. The parameters are VAS 331.6, Qts 0.425, Xmax 2.5, Cms 324.6, Qms 3.576, Le 0.74. Can I use your cabinet with this woofer?

To be sure of the suitability I would need Fs and preferably Re. Based upon the T/S-parameters so far I would think Cubo 15 Standard is the most likely candidate. However as you say you're a mobile DJ, it's likely you would find it's short coming on excursion capabilities. A Xmax of 2,5 mm isn't much. Cubo 15 will get more bass out of this speaker then a reflex would but above 200-300 Watt it's meeting it's limits or exceeding them.

I.e. The Ciare 12.00 SW used in the Punisher has almost 3 times more displacement then this woofer.

Best regards

Cubo

The only parameters Peavey gives are:
15"
Impedance: 8 Ohms
Power capacity: 800 W Peak 400 W Program 200 W Continuous
Sensitivity: 96.4 dB / 1 W 1 m
Usable freq. range: 40 Hz ~ 3 kHz
Cone: Kevlar® impregnated cellulose
Voice coil diameter: 2.5" / 63 mm
Voice coil material: 2 layers, thermally bonded copper wire Kapton former Nomex® stiffener
Net weight lb. / kg: 10.4 lbs. / 4.7 kg
Znom (ohms) 8
Revc (ohms) 6.00
Sd (Square Meters) 0.0855
BL (T/M) 13.35
Fo (Hz) 34.4
Vas (liters) 331.6
Cms (uM/N) 324.6
Mms (gm) 66.5
Qms 3.576
Qes 0.482
Qts 0.425
Xmax (mm) 2.5
Le (mH) 0.74
SPL (1W 1m) 96.4
No (%) 2.40%
Vd (cu. in. / ml) 26.1 / 428
Pmax (Watts pgm.) 500
Disp (cu. in. / ml) 131.40 / 2154

So what you are saying is because of the limited excursion I could not run it above 200 watt? That would work. I only do small to medium sized weddings. Unfortuntally I cannot return this woofer and do not want to see it go to waste. Just looking for a light weight cabinet than can produce decent bass.

I just finished testing this box, loaded with kappa 600wLF, I am very happy with it, for such a small box, it was very easy to make. I am going to make 3 more, to be going on with. Thanks for the design.

Hi Jeff,

Simulation of the Peavey indicates that it will have a low mechanical power handling as suggested. I suppose it could be used with a low pass at 40 -50 Hz (18 dB/octave or more). Simulation also revealed that it will be a 50 Hz and up bin, instead of 40 Hz and up, like regular speakers in Cubo 15. As Peavey doesn't show any Xmech figures I would personally start feeding it 150 Wrms, with ~45 Hz, 4th order high pass and see how much more it can take.

If you're ever only going to load Cubo 15 with the Peavey, you could get away with using ply in the order of Yellow Pine (Grenen/vuren in Dutch). Use preferably 7-ply or more. Together with the Peavey this should get you a true light weight Cubo 15.

@Soundjon: Good to hear you like it. The Kappa 15LF was the first speaker used in this cabinet and I still like to use it. Personally I think 4 times Cubo 15 loaded with that speaker will be the foundation for a very decent rig.

Best regards

Cubo15