bass speaker cabinet

[sandlehat]

I am attempting to build a high power but decent quality bass speaker cabinet as a personal project and for a friends PA hire system.

Is it possible to build a cabinet outputting 1500W as low as 30Hz?

The largest driver I have been able to find is the Eminence Kilomax 18" 1250w, with a frequency response dropping to 25Hz. I understand that cabinet design and placement will affect that though. Using two drivers seems the only way to get the power, but I think that would make the cabinet too large.

My friend would like the cabinet 24", 22", 28" (w,d,h) but I don't expect to keep to that due to golden ratio, and driver restrictions.

I could do with some advice on port and baffle placement, as I'd like the sound to be as true as possible.

Any information on this would be appreciated, thanks.

 

[numpty with a crowbar]

OK, there are thousands of ways of doing your own DIY bass cabs, and there aren't any real "right and wrong" ways to do it.

the general rule of thumb is the more airspace, the more bass resonance you'll get, and this can compensate a hell of a lot if your speakers don't go right down to sub bass frequencies
First set I made were 15 inch 300 watters in massive great cabs with scoop fronts on them (the cabs were 2 ft deep x 4 ft long x 2 wide), they produced so much bass end I took em to a backroom gig and beer bottles were vibrating off the bar shelf (Kid you not!). Similarly I made a pair of more compact cabs for a pair of EV 1KW's and although they're much louder and punchier, they don't have the same bottom end resonance.

Best bet IMHO is to follow the same kind of route as the dub rigs do if you want a big bass end - massive great scoop cabs. That way you avoid the need to fit port tubes etc etc...

Make sure you build them big and solid - that much bass will vibrate a cab to bits - literally, I've seen screws work loose on home made bass bins in the past so build it big, solid, and don't be afraid of over engineering it, not only do the bins need to be big for thier own sake, but it's likely you'll be stacking mids and tops on the top as well.

Pop down to your local maplin and get a book on home building cabs - most of it is waffly rubbish, but there are some decent principles in them about baffles, positioning, materials etc.

Post up your design option(s) and lets see...

Failing that if your mate has a van and fancies a drive to Newcastle, I've got a pair of bins each loaded with 2 x 300Watt fane 15 drivers I'm thinking of selling