I doubt it is the amp. I would recommend a separate streamer… Bluesound sell budget streamers that are very well regarded and sounds like it would be in your budget.
I have never had luck treating symptoms (equalizer). I recommend going for the source of the problem. You can clean up multiple problems at once. PCs are very noisy and transmit that through the signal chain. A purpose built streamer avoids all of this. I tried all kinds of PC, Mac, laptop solutions and didn’t really get anywhere until I bought a streamer.