Cubo 18

Is the difference between Cubo 18E and Cubo Sub a few dB of sensitivity and a few Hz of extension, or is there anything drastic difference?

If there isn't a huge dip in sensitivity I'd like the extra 5 or 10 Hz that Cubo Sub provides, and a nicer form factor (for my application at least).

@cubo
Yes i will be using rubber feet. Approx 15-20mm high that will sink about 1,5-2mms under the weight of the subs. This will ensure (mathematically) optimal decoupling and any resonances will be moved out of the audible range down to about 5-10hz.

Will be doing some free air measurements soon to check on the frequency response and more. Just from a little testing these small boxes have remarkably high output and have a nice clean sound. I like them a lot from the little testing i've been doing.

@Rotebass: Cubo 18 and Cubo Sub are roughly in the same sensitivty ballpark, this is also a bit driver dependant of course. Cubo Sub drops considerably lower though (for those interested in heavy bass).

@Thohaug: Rubber feed are cool

Always good to see more measurements too.

Best regards

Cubo

anybody tried the RCF LF18X451 in a cubo yet?

would it work? specs are as below:


Resonance frequency: 30 Hz
DC resistance: 5.4 Ohms
Mechanical factor: 6.7
Electrical factor: 0.29
Total factor: 0.28
BL Factor: 30.5 T · m
Effective Moving Mass: 260 g
Equivalent Cas air load: 220 liters
Effective piston area: 0.122 m²
Max. linear excursion (mathematical): 13.5 mm
Voice - coil inductance @ 1kHz: 1.4 mH
Half-space efficiency: 1.90%
Power handling capacity: 1800 W AES
Sensitivity: 97 dB
Frequency Range: 30 Hz - 1000 Hz
Effective Piston Diameter: 395 / 15.6 mm/inch
Max Excursion Before Damage (peak to peak): 54mm
Minimum Impedance: 6.8 Ohms
Voice Coil Diameter: 115 / 4.5 mm/inch
Voice Coil Material: Copper
Voice Coil Winding Depth: 34 / 1.33 mm/inch
Number of layers: 2
Kind of layer: inside / outside
Top Plate Thickness: 15 / 0.6 mm/inch
Cone Material: No presed pulp
Cone Design: Straight
Surround Material: Polycotton
Surround Design: Triple roll

The RCF LF18X451 has a good balance between efficiency and excursion, meaning it will work in both Cubo 18 and Cubo Sub. I've used a similar driver in Cubo 18 recently and with 1800 Watts it was definately unlike other Cubo 15 and 18 experiences. In fact it came closer to the vibrations felt with Cubo Sub, so putting it in Cubo Sub in the first place would be a good choice.

Best regards

Cubo

am building 2 cubo 18Ex for some speakermax WF18THOR speakers let hope these speakers perform well as i know these box can

Hi would the Fane Sovereign 18-500's work in it? if not is there a cheapish driver that we could use?

@T.geessounds: A textbook example of how I would like to see every Cubo build, how does it fare?

@Welovit: Please, no. I mean, yes it would work but please don't. It all looked good till I saw the Qes and the physical weight. How about the Thomann 18 500? On paper it almost looks to good to be true.

Best regards

Cubo

Also what difference does it make with the magnet facing inwards, or outwards?

these boxes are really speaker friendly i run these 2 cubo with budget speakers on a 2400 crown bridge 40 to 90hz lr24 an these thing beat
thanks :woohoo:
Sir Cubo..