Cubo Kick

Thanks for your reply. But it seems I copied the wrong parameters (sorry for that). They were for the 15-4 S. The right theile below. That might work better with the lower Xmax? The plan is to use this Kick as a low mid driver in combination with a Cubo 18 and a mid/HF cabinett on each side ran on Lab 4000, Lab 2000c and Lab 1300c.


Qms 11,81
Qes 0,31
Qts 0,31
Fs 48,60 Hz
Re 6,06 Ohm
Mms 107,00 g
Cms 0,19 mm/N
Bl 25,09 T*m
Sd 830,00 cm2
Vas 96,87 liter
u0 3,41 %
XMax 8 mm
Le 0,71 mH
Rms 2,77 Kg/s
Efficiency Bandwidth 154,52

OK, that's a better choice. Let's not pin it down on one parameter though, like Xmax, although an u0 over 3 % is a good indicator for a 12" or 15" kick driver.

Best regards Cubo

Hello there, would Fane Sovereign 12-300 work in Cubo Kick 12? Or other from Fane product range. Looking to use 12-300 in cubo 12's and want to build kicks as well, sticking with the same manufacturer. Not sure what parameters are crucial in kick design. thanks!

I would go with the 12-300 for both Cubo 12 and Cubo Kick 12 (higher efficiency/ lower Qts works well in both designs).

Cubo

I have a few RCF MB15N351.
Would they be oki for Cubo kick?
Resonant frequency fS 42 Hz
Electrical Q QES 0.24
Mechanical Q QMS 4.00
Total Q factor QTS 0.22
Suspension equivalent air volume VAS 191 litres
DC resistance RE 5.6 Ω
Minimum impedance Zmin 6.0 Ω
Voice coil inductance LE 1.65 mH
Force factor B·l 22.5 T·m
Suspension mechanical resistance RMS 5.3 N·s/m
Suspension mechanical compliance CMS 166 µm/N
Moving mass MMD 61.4 g
Moving mass (including airload) MMS 80 g
Surface of the diaphragm SD 900 cm²
Effective diaphragm diameter Ø 33 cm
Maximum linear excursion Xmax ± 6 mm
Excursion limit Xlim ± 19.5 mm
Displacement volume at Xmax VD 540 cm³
Efficiency η₀ 5.68 %
Efficiency bandwidth product EBP 175

Those are oki for sure,

The RCF MB15N351 has been optimized for mid-kick, the only draw back might be the light-ish cone, I would put a lot of dampening material on the walls of the rear chamber (just in case).

Cubo

Hi Cubo! Wonderful design! How would the Celestion FTR15-4080FD work in the Cubo Kick?

Resonant frequency     fS     35.4 Hz
Electrical Q     QES     0.30     
Mechanical Q     QMS     3.91     
Total Q factor     QTS     0.28     
Suspension equivalent air volume     VAS     164.3 litres
DC resistance     RE     5.6 Ω
Voice coil inductance     LE     1.38 mH
Force factor     B·l     23.05 T·m
Suspension mechanical resistance     RMS     7.24 N·s/m
Suspension mechanical compliance     CMS     160 µm/N
Moving mass     MMD     112.24 g
Moving mass (including airload)     MMS     127.19 g
Surface of the diaphragm     SD     850.9 cm²
Effective diaphragm diameter     Ø     33 cm
Maximum linear excursion     Xmax     ± 6 mm
Displacement volume at Xmax     VD     510.5 cm³
Efficiency     η₀     2.37 %
Efficiency bandwidth product     EBP     118    

The Celestion FTR15-4080FD is an allround driver, whether it's bass, mid or kick, it should feel right at home.

In 2020 I've built two Cubo Kick 15 based on 18Sound 15ND930 for a venue in Leipzig.

Now that we have events again I can say that I am very happy with these speakers and I would say the build was a success.

During this build, I recreated the drawing by Cubo in Librecad to figure out some dimensions I could not discern from the drawing and to decide on details like where to put terminal plates and mounting holes for the speaker or the rear wall.

Maybe this can also be helpful for some other people who are building Cubo Kick 15, so I decided to share these drawings.

The proposed locations dimensions should provide clearance for Adam Hall 87160 Terminal plates and 18 Sound 15ND930. For other drivers/terminal plates, your mileage may vary.

Thanks man, appreciate it.