Random audio questions for work - I want to drive a subwoofer array - 4 channels right now.
I want them to be loud enough that it can be felt physically in your tummy at 5-10 foot distance. I want 4 independent channels, driven by a computer line-level output. I'm completely not caring about quality, I just need some booms and hums and shakes. As always I want to do this on the cheap.
So my current plan is to find a big 4 channel power amp or two big 2 channel power amps, and use some cheap car subwoofers on it. I think I might possibly be able to scavenge a power amp or two from somewhere in the office, there is a rack of them which I think haven't been used for a couple of years, need to check out what the specs of them are.
The alternative is to use something like this, a couple of pairs, but I'm not sure if they'll be loud enough:
I don't think I can use a home theatre sub, as they appear to be designed not to point the sound in a direction, and I want something more directional, more like a PA or car speaker.
A few things I don't know though:
1)Does that combination sound practical, or is there an obvious better way to do this? Is the better way still going to be better if I happen to have a free power amp.
2)Do I need a specific subwoofer amplifier, or will any power amp that is rated for the output of the subwoofer be okay? I don't necessarily need low pass filtering, as I have full control over the signal, am I right that sending a too high sound accidentally for some reason won't break the speakers?
3)What sort of output power do I need, for real boom to the stomach kind of boom.