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Cubo 18:Cubo 18 is a multi purpose, stand alone bass bin that, like Cubo 15, will equal or out run a single 18" BR*, of similar size, from ~ 40 Hz and up in terms of sensitivity. Cubo 18 works with a wide variety of 18” drivers. It has a cut list from just over a single 18 mm*** sheet (244 x 122 cm) / (8' x 4') with a single angled cut. Cubo 18" realizes a cost effective, small and light weight enclosure following the KISS-principle.
Development:
In 2007 the first prototype was build and tested. Cubo 18" is the 5th prototype in a line of hybrids aiming at the achievements as stated above. Cubo 18 Standard and Cubo 18 Extended will both work with a wide variety of drivers, if uncertain which one will be most suited, build Cubo 18 Extended or mail me at
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Size: 62x62x65cm (HxWxD)
Frequency: From 40 Hz up to 110 Hz
Enclosure Type: Hybrid
Footnotes: 18” drivers preferably with an EBP of 100 or higher; Fs (22-42 Hz), Qts (0.25 - 0.58), Vas (200 - 450 L) / (7.4 – 16.7 ft^3). Where EBP = Fs / Qts . Measurements will follow.
Cubo 18/15 (difference): Cubo 18 is 3 cm (/ 1 1/6th inch) deeper then Cubo 15. Due to phase similarities Cubo 18 and Cubo 15 can be used together without noticeable issues. Cubo 18 has on average slightly more output for a given input in comparison with Cubo 15 (based upon electro-mechanical relatively similar drivers), especially between Fc high and Fc low,whilst Fc high and Fc low, remain similar (= cut-off frequency).
Cubo 18: Front view
Cubo 18: Side view without side panel
Cubo 18: Driver for comparison
Cubo 18: Detail magnet and bracing
Cubo 18: Magnet facing out
Cubo 18: Magnet in chamber
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Would u ever draw the plans for the cubo 218 (3.6cm lower)????
I might...I probably will...one day..
do you think these drivers will work well in the Cubo18 ?
That driver seems to be the equivalent of the B&C 18TBX100.
Drivers like the 18TBX100 are not the most efficient. Efficiency is basically calculated from Fs^3 / Qes/Qts x Vas. If you compare these with for instance the Eminence Kappa 15LF, you'll see that the Fs is lower, Qes is about the same, and the Vas is higher, so ultimately one could expect a similar efficiency to the Kappa 15LF. On the good side, the last time I measured the Kappa 15LF in Cubo 15 Standard it showed an f10 of 35 Hz (pretty allround).
The benefit from these drivers would be the 4" VC and low power compression plus the abilty to push some air if plenty of power is available. Meaning that you'll need an amplifer that could easily deliver about 1000 - 1500 W per driver. Also I would advise to put the high pass closer to 30 Hz then 40 Hz (a driver that doesn't move doesn't cool).
It would work best in Cubo 18 Extended.
Best regards
Hi Cubo , just recently got a pair of PRV audio 18sw2200 woofer in my possession, do you think these drivers will work well in the Cubo18 ? and which would be better one to go with for this driver - standard or extended cubo?
Model 18SW2200
Diameter 18 in
Impedance 8 Ω
RMS Power 1100 Wrms
Program Power 2200 W
Sensitivity 97 dB_SPL
Freq Response 35-1k @-10fdBHZ
Xmax 9 mm
Res Freq (FS) 34 Hz
Equiv Vol (Vas) 209 L
Elec Q (Qes) .37
Mech Q (Qms) 7.2
Total Q (Qts) .35
Sd: Cone Area 1210 CM2
Mms: 209 g
Strength Factor 25.5 Tm
RE 6.2 Ω
VC Diameter 4 in
Would u ever draw the plans for the cubo 218 (3.6cm lower)????
Cubo15 wrote:
Best way would be to put the mouths together, so that you can use a single divider, without the panel bracings. Apart from that structual/ weight benefit, there won't be any pro's / con's other then those from the ongoing singles vs doubles debate.
Anyone who got experience in building 2x18" cubo?
Me, me, pick me.
If you make the Cubo 218 about 3.6 cm lower then 2 times a single, you can still cut it out of the same sheets, strictly without altering performance. If however you want them to be 124 x 62 x 65 cm, you'll likely need an extra sheet.
Mostly seen double Cubo 15's tho.
Best regards
Cubo
okay, thanks for your answer
i´ll think this over and see if there might be a 2x18" cubo
Best way would be to put the mouths together, so that you can use a single divider, without the panel bracings. Apart from that structual/ weight benefit, there won't be any pro's / con's other then those from the ongoing singles vs doubles debate.
Anyone who got experience in building 2x18" cubo?
Me, me, pick me.
If you make the Cubo 218 about 3.6 cm lower then 2 times a single, you can still cut it out of the same sheets, strictly without altering performance. If however you want them to be 124 x 62 x 65 cm, you'll likely need an extra sheet.
Mostly seen double Cubo 15's tho.
Best regards
Cubo
Is it possible to build a 2x18" cubo or will it be better to build 2 1x18" cubo?
Anyone who got experience in building 2x18" cubo?
decided to build one n give em a go
Welcome to the family
If that can happen, your cabinet is truly amazing. With careful driver selection, cabinet build quality, and precision processing, I believe it is totally possible
Well, looking at y2stevo's measurement, that seems to hold up from ~70 Hz and up (adding 3 dB to the 2x18" for double the power of the Cubo 18).
www.freespeakerplans.com/component/kunen...&start=210#19101
Driver selection is a mayor issue. However a driver with the greatest overal SPL gain seems more than once to compete with sound quality.
For now, I feel that my observations and conclusions of the last 3 years are worth more then a top 10. Thanks to the numourous feedback from end users on the fora (plus over 500 through e-mail) a top 10 will eventually form.
Till then let's promote build quality and let's wait what the future will bring?
Best regards
Cubo
Yes it looks to be the same frame is B&C
Ok Cubo,
bad comparison with the Lambo and the tank. I am still thinking about and it is making less and less sense.
So what would be your up to date top 10 choices for neo and top 10 for ferrite? Keep in mind that ~700watts 8ohms and ~40hz. I am looking to match the output of two dual 18 bass reflex cabs getting ~1400watts at 4ohms each ~40hz hpf with two cubo18s getting 700watts at 8ohms each ~40hz hpf. I am basically trying to take full advantage of the efficiency of this cabinet. What it comes down to is two cubo18's outrunning two dual18 BRs. The dual 18 BRs consuming twice the power from the wall, taking up twice the space, and weighing nearly twice as much as the cubo18's. If that can happen, your cabinet is truly amazing. With careful driver selection, cabinet build quality, and precision processing, I believe it is totally possible.
Any thoughts would be appreciated.
Thanks!
P.S. still thinking about the Lambo vs. tank
Low Frequency Designs (3867)
