Cubo Kick 15

Cubo Kick is a mid bass bin to enforce the Cubo-series in it's weaker range (100 - 125 Hz and higher) or any other bass cabinet that lacks in that region. Over 10 prototypes were build to ensure a maximum output that's on par with current kick bin designs like the Xtro 2 x 15" section and the HD15. Future measurements will prove that, till then you'll have to take my word on it
Cubo Kick 12 is the smallest cabinet at 45 x 45 x 50 cm (H x W x D). Intitial measurements show it's capable of 110 - 250 Hz in singles, a bit below 100 Hz in doubles.

Cubo Kick 15 is the largest at 62 x 62 x 62 cm (H x W x D), with the exact same dimensions as Cubo 15 and only 3 cm less deep then Cubo 18. Aimed at 80 - 200 Hz, it has the most output in the 120 Hz area, for that well known "pressure on the chest kinda feeling".
Cubo Kick 15 at 45 cm wide is best used in combination with 12" drivers to get the middle way, 100 - 220 Hz in singles.

Once again it fits from a single sheet of 122 x 244 cm / 4' x 8', use Baltic birch preferably.

Cubo Kick 15

Designed around the 18Sound 15ND930. Other drivers that should work:

- Eminence Kappa Pro 15
- Faital Pro 15FH520
- Faital Pro 15FH500

Cubo Kick 12

Designed around the 18Sound 12ND830. Other drivers that should work:

- Faital Pro 12FH520
- Faital Pro 12FH500

Recommendation is to use 3" VC drivers, however there's plenty of 4" VC drivers that will work.

Consensus

Cubo Kick needs a consensus of it's usable frequency range and new measurements. I like to keep it from official release till that's cleared. It's designed to keep up with 2 or 3 Cubo 15 slash Cubo 18. For example, on top of two Cubo 15's it will raise the height for the high mid top to ~180 - 190 cm, bringing it well above the crowd ears.

It doesn't need high excursion drivers, though they will work, I expect the excursion to be 3 - 4 mm (6 - 8 mm p-p) in it's working range up to 500 W. That means that combined with a 3" voice coil, there's plenty of low Qts drivers, medium to low Vas, high Fs, low-ish Mms, decent BL, preferably low Le drivers out there for people on a keen budget or real quality affordable for the working man. Oh yeah, high EBP!

Some pointers

Options for influencing how it sounds:

- As it's a port assisted design that has effectively 4 ports of equal size, you can gradually lower the tuning by closing one after another. Lower tuning means it does go lower but at the same time lowers the output below ~110 Hz.
- At the same time it's an effective measure to compensate for the Fs, Qes/ Qts and Vas ratio and size for a particular driver, some drivers might even be best of in a closed cabinet.
In other words, you could try what you like best or what the driver likes best or both.

Another point would be the use of damping, like glasswol, rockwol, synthetic woll, Pritex, etc. Without going into the advantages or disadvantage of one or the other. Use some in the rear chamber as long as the flow to the ports isn't hindered. You could even use some in the beginning of the horn. Personally I would cover most but not necessarily all walls/ sites, that's also to a degree changed by the circumstances at hand.

Preliminary measurements Cubo Kick 12 vs Xtro, +6 dB to give the approximate result of 2 x Cubo Kick 12 vs (2 x 15") Xtro, with the same power.

Best regards

Cubo

Excellent! So 1 CuboKick to 2 Cubo15/18's? Looking forward to seeing the plans!
Thanks

Long time no see Cubo! My fault I have been gone due to injury. BTW, before I got injured I did not buy the drivers you had said were not suitable. I have a collection of pairs of drivers with various Cubo designs in mind. Including a need for the design you just posted. Do you already have any plans of these in plywood thickness available in the U.S.? There is no 15mm plywood here.

Drivers I have awaiting wood, pair of 15 inchers suitable for Cubo 15s, pair of 12 inchers suitable for Cubo 12s and a pair of high efficiency 15s suitable for the plans you just announced.
I am anxious to be the first in OKC to have CUBOS as an advantage!!!!
Please tell me you have U.S. friendly cutsheets I can get!

If I do it a little at a time I think I can jig, clamp, glue and screw....but I have to get the wood precut!

any update??wanna try this kick

t.geessounds wrote: any update??wanna try this kick

I am a bit anxious myself. As I mentioned 2 of the 15s I have should work well in a regular cubo 15, two of them are very high efficiency, but not ideally suited for that frequency range. They should be relatively ideal for this application. I would certainly be able to report back with some results as well. Could be useful!

Measurement-wise the design has been optimised. Cubo Kick 15 has been designed for 80 - 200 Hz, which to my hearing sounded well enough. However I do not have a lot experience with kick cabinets.

Before I designed Cubo 15, I had already heard and build 30 "other bass cabinets" ranging from reflex to front loaded horn, for 12", 15" and 18" drivers. So I had a large field of reference.

The number of total prototypes made for Cubo Kick 15, 12 and 212 combined is above the 10. I also made an Xtro 2 x 15" bass section and an HD15 for comparison. Some of these prototypes were octagonal horns, with and without phase bung/ plug. So you could say, as far as research and development goes, I went all out. Especially as it's a freespeakerplans design.

So as far as my own opinion goes it's all good but then again not everyone is a fan of the other Cubo-designs, so not everyone might agree.

@BJM362: The usual follow up: I present a plan, in the mean time work out small mistakes that might have sneaked into the plans. Then release the 12" version and other version for those that want 62 x 62 x X cm, then if the plan is succesfull, I release the non-metric version but only if I'm not too busy in the non-internet life. I'm currently sneaking up on tiny-winy, well hidden mistakes.

@Tetris: One Cubo Kick 15 for 2 to 3 Cubo 15's or 2 to 3 Cubo 18's or 2 Cubo Sub's. All depends on how bass-heavy you like it.

Best regards

Cubo

Cubo, in all honesty I am really glad to see you still participate here. When I first showed back up kind of lurked for a bit because I didn't recognize most the users!
Your designs are effective, useful and simple enough to build, I can probably assemble them even with my bad back..If I can get them cut. I guess for the completed plans that I have workable drivers I can get convert them to US available wood thicknesses by hand. If I can take good cut sheets into Home Depot they will cut it for me for a small extra fee! I am just nervous about getting it home and part of it being wrong. That would not be cool!

Anyway I think I can still be the first here in this city to have CUBOs period, and best to you!

when will the cubo kick be release ?? am up for if to build one for testing

@t.geessounds:

it does however need a consensus of it's usable frequency range. That's also the reason I like to keep it from official release till that's cleared

Also, my spectrum analyser decided to stop working, so I'm unable to measure it officially and a Cubo plan wouldn't be the same without a measurement. That being said, send me an e-mail and the plans will come your way.

Best regards

Cubo

This CUBO kick 15 design seems pretty efficient if you say ratio is 1:2/3 Cubo 15/18.

May I know the result during the HD15 comparison?