I have a 4 channel amp that is 4 x 100 at 4 ohms, 4 x 200 at 2 ohms, and 400 x 2 bridged at 4ohms. I was running the amp at 4 x100 watts at 4 ohm, but i wanted to make my speakers louder, so i recently put in 2 8 ohm mids and have them bridged together to make them at 4 ohms taking 400 watts or 200 for each speaker. And for some reason my amp will get really hot after about an hour, when i was running the 4 speakers at 100 watts each, it would never get hot for a while. Is the efficiency so much lower being bridged that it heats up the amp this quick or is something else wrong thats making the amp real hot real quick.
Beings class AB amps are generally 50%-60% efficient and the rest is heat, Id say its the heat sink doing its job. Especially if your running the amp at its "limit" :dontknow:
How do you get 400watts divide into the two paralleled 8 ohm? They can only be bridged on two of the four channels giving you 200x1@4 ohm. So 100 watts a piece.
the amp is set up with 4 channels at 100 watts a piece at 4 ohms. The amp can have at max 800 watts if I bridged the amp. I have it set up at 2 8 ohm mids being bridged so i still have to more channels to put speakers too. Bridging 8 ohm mids drop them down to 4 ohm load on the amp only using 400 of the available 800 watts max that my amp can push.
If your only using 2 of the four channels you are only getting 200rms or 100 per speaker.
I would venture to say that you are clipping the signal. Trying to get more from the amp then it can produce. Clipping causes a spike in current draw and being AB it isn't efficient as stated so you are getting a lot of current transferred to heat.
Back the gain down to just below half and that should help.
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