Could somebody please point me to a source for a low-cost, very high power, mono audio amplifier, that could put approx. 1000 watts into a
4-ohm load ( i.e. ~60 V-rms and ~15 A-rms.) This is for an industrial application, so it doesn't have to be super high-fidelity. The preferred bandwidth would be from 5 Hz to 10,000 Hz, but we could get by with a little less.
A kit would also be of interest, or even just plans & a schematic diagram for a build-it-yourself unit.
QSC RMX series will do what you want very very reliably. It's 3dB down point it 5Hz as well. The RMX1450 run bridged into 4ohms gets you one channel of 1400W, but there are larger models if you like. zzounds.com has decent prices.
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$400 at zzounds.com
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Best Regards,
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If you build it yourself, you'll pay more in parts than a commercial unit (because you don't have access to the heat sinks, power transformers, or matched output devices, which are the expensive pieces). Plus, you'll end up with something that doesn't have adequate safe-area protection, so it'll smoke the first time you inadvertently short-circuit the output or connect it to a reactive load. I'm *assuming* that "industrial" means that there's a degree of reliability required.
Much better to buy one. As others have pointed out, they're not all that expensive; and you can probably even find one used, for cheaper.
Two notes:
(1) Many commercial power amps intended for audio have high-pass filters, higher than the 5Hz you require. Some can be disabled. You'll need to check. Even then, you may have to do some modifications to get down to 5Hz.
(2) Many commercial power amps are rated for "music power" or "peak power", not continuous sine wave. If you try to run 1000W of continuous sine wave into a load, they'll overheat and shut down (or, for the less expensive ones, smoke). Often, the ratings have to do with how much current/voltage the supply can produce, rather than how much heat the output devices can dissipate, which is usually the limiting factor.
Both those concerns will also apply if you build your own based on published circuits.
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