I decided to buy 4 Eminence LAB12C subwoofers, there was a sale on ebay and couldn't let it go.
I will mainly use it for HT, and music. I have a stereo setup, 2 Canton CT2000 (which I would like to replace with something more 'modern' looking). I have a mini DSP and lots of power amps, QSC, to give 500-600W RMS to each sub, total of over 2000W. I have a second amp, if needed, to bump it to 4000W. Real QSC watts...
Plan is to buid 2 cabinets with 2 woofers in each cabinet.
I have been reading about room gain, I don't think I will get any. My longest wall is 11m (36 ft) and 2nd longest is 9m (30 ft). According to a rule of Bill I read, 565/ft, I will only get gain below 18 or 16Hz?
Commercially I found 2 brands using the drivers in a different way:
- BK Monolith +: ported, 95L (+ a rather short tube port)
- Zu Audio Undertone: estimated 60L sealed
- Zu Audio Submission: estimated 90L sealed
They all claim a performance below 20Hz (in room...). I would lie a max vol of 120L per driver
I have been modelling the ported dual version, the only way I can make it work is with a tuning on 22 Hz, the xmax is just reached at 30Hz. I would need 2 vents (i took square slots) of 0.08*0.4m, and 1,8 m length. The cabinet would be 60cm deep, so this is a double fold with 2 braces.
Using a tube seems more expensive than a slot and a slot adds some structure to the cabinet?
If I look at the winisd plots it all looks a bit ****, I'm not getting anywhere near 18-20Hz. Are there designs/solutions I overlooked? I think of making 2 larger cabinets (higher WAF acceptance) to avoid having subs everywhere, but should I make a combination, 1 driver down firing, 1 front firing to distribute the frequencies better? Dual opposed has an advantage for vibrations but sonically, it's just a sealed so no added extension. Would love your input so I can start building when my drivers arrive in 1 week from now