Designing and Building a 10 Channel Amplifier

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Why am I building this?
Because I can and want to, mostly. Also because I don't entirely trust the DSP solution for speaker crossovers. Active analog filters are set and can't lose their programming, barring a catastrophic (and extremely rare) failure. You might say that failure for DSP is extremely rare, but it's already happened to me. After a power outage, my miniDSP 4x10 lost it's configuration settings and luckily I checked before played anything. Having the full signal at high volume going to my expensive tweeters would not be a great start to a relaxing evening of listening.
The amp design is relatively simple, a typical three stage configuration with good quality parts. I tested the prototype for operational stability and thermal stability and saw no issues. Not shown in this video (but I'll do it in an upcoming one) the stability testing included adding capacitance to the output. I used a 1uf cap and the amp did not break out into oscillation.
Square wave testing shows a fast enough slew rate and there will be more testing when I get the professionally made boards to do the full power tests.
Note that this is an integrated amp that has 28db of gain and doesn't require a preamp.
The case I built is a little rough and not even close to finished. But it is HUGE and has plenty of space for the ten channels I want to put inside. Yes, I've settled on 10 channels - 8 for the main speakers and two to spare for a possible centre channel and the other channel can run the bass shaker in my seat. I'll have to rework or remake the back panel and make a cool looking front and top panel, plus install some dividers inside.
The transformers were salvaged from vintage power amps and are easily powerful enough to run all 10 channels at good listening levels with headroom to spare. Each will have its own large capacitor bank for smoothing and reserve, with a soft start circuit on each.
Conveniently, the larger transformer also has a low current 22vac winding that's perfect for the active crossovers supply.

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