while you're pricing out options, consider
something like this for your amp stage, as it's primarily all SMDs except the things that would be far too expensive to SMD. You can run it off the computer PSU directly, or off a meanwell switching psu (which is basically what your computer psu is, only the meanwell is obviously smaller). sounds amazingly clear and clean, even with floorstanders. and even running the bugger for hours on end with punishing music through 3-way floorstanders, it gets
barely hotter than room temperature.
I still haven't found anything right for your EQ though. considered mentioning some of the smaller car-based EQs you could gut, but probably no better than what you've already found. just incase, here's the ones i found.
option a option b
Oh, and polyester film is generally considered to sound way better than electrolytic when comparing same capacitance. basically consider electrolytic to be the least desireable in the audio path, but an excellent choice when used in a PSU filter for its polarity properties (or something like that, i'm no guru).
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