4ohm 1000w+ subwoofer amp

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#22
Beau said:
The load is 4 ohm, 2 8 ohm drivers in parallel. Thanks for all the suggestions so far. Keep them coming. 🙂
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You could build that from 4x250W/4R single-ended amplifiers, which need only a +- 48V supply and can be constructed from much cheaper and more readily available transistors and decoupling caps, using a published and well-tested class AB design. Configure them as two bridge-tied amplifiers, giving you 2x500W/8R, and drive each coil separately. There are plenty of published 250-300W/4R designs that you can choose from.

While it's not 1kW, I am currently trying to build a TDA8954 amplifier for a similar situation. Each chip will do 300-420W/8R (depending on how much distortion you will accept) bridged, so I am using two of them to run a 650W dual voicecoil (8R+8R) sub. I'm still waiting on PCBs to arrive and I don't know that I have made good component selection decisions or even have a usable layout... If it works and doesn't let the magic smoke out, it will be a very cheap "840W" amplifier.

Same logic goes for TDA8954 boards on eBay, but I'm not sure how well-built those are; the output filters in particular look very fragile and there are many anecdotes of the snubber caps being loaded with the wrong value (250n vs 250p), causing things to burn.
 
#23
I think the easiest way to do 1KW in 4 ohm is a H bridge Class D amplifier supplied by ca 100Vdc or 2 bridged class d amps supplied at +-50V. .... both solutions will need to supply ca 25A ... but that should also be possible 😉 look for IRS2092 + IRFB4227
If you are not well into constructing class d already, then going 1000W in the first go is too ambitious .... it has taken me years to develop something delivering +250W in a stable and safe fashion 😉 ..... find a module already made, and supply with a good SMPS
 
#24
Baldin said:
I think the easiest way to do 1KW in 4 ohm is a H bridge Class D amplifier supplied by ca 100Vdc or 2 bridged class d amps supplied at +-50V. .... both solutions will need to supply ca 25A ... but that should also be possible 😉 look for IRS2092 + IRFB4227
If you are not well into constructing class d already, then going 1000W in the first go is too ambitious .... it has taken me years to develop something delivering +250W in a stable and safe fashion 😉 ..... find a module already made, and supply with a good SMPS
Click to expand...

Do you have any good threads on diya, or published schematics, PCBs, anything representing the outcome of your years of work that the rest of us could maybe borrow from? 🙂
 
#27
For a 2x 500 W /8 Ohm amp your are not able to build something with a case by your self, even for twice the money you would pay for a new, good low budget T-Amp or Behringer. Which will give you a minimum of two years time, trying to destroy the amp and getting them fixed for free.
Throw in a DSP (into the amp, as there are build in DSP versions) and have a one piece, perfect room compensation for each of your two woofers. From the money you saved, a calibrated measuring mic will be a good investment.

I have turned dozens of loud, air moving PA amps into living room pet's, just by installing high quality, temperature regulated PC fans. In most cases better quality than the fan they replaced. This "I don't like it, it has a fan" is the most stupid theme around amps since the PMPO music power discussion.

If you use a PA amp so hard, that the temperature regulated fan gets noisy, the same second you hear the fan, you will also hear the police knocking at your front door...
 
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