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The horn of Cubo Kick 15 starts to 'kick in' at about 110 - 135 Hz, so from there on you'll have maximum output. Below that, down to 80 Hz you have the largish port and the not-horn-loaded-driver doing all the sound output, so output will drop a bit.
Mr Cubo when you say these can be used down to 80 hz does that mean a 80hz crossover point? or does it mean 80hz is the limit therefore a higher crossover point is needed?
Always look at the Vas in relation to the Qes/ Qts.
Also the Vas value for the 12MB700 is 101LT( 3.57 cuft) and on the 12ND830 is a bit lower 72LT(2.54 cuft)....
I've not simulated that driver but it looks like an awesome horn driver.
The 12" version of this driver is also available here in the US so I'm wondering if it's a good match for the 12" version of Cubo Kick..
Accidently, that's also where it should be as per plans
I have cut the baffle's hole right in the center of the baffle panel as it seemed to me the most logic position for it...
I would just take a router and take a chip of wood out the back panel, where the chassis touches. In fact you'll probably only need to cut a groove that's 5 - 7.5 mm deep and a couple cm wide/ high. See the added picture.
I have realized that the Faital Pro12FH500 is not fitting as it's too deep, with it's 155mm depth it's hitting the back panel.