I’ve done a lot of research on speakers in the past but I know very little about amplifiers (I’ve only ever used AVRs). I have an old pair of Boston Acoustic A70s that I had refoamed. I’m looking for a basic/budget amplifier for them to listen to music. I don’t mind if it is new or used, but I’d like something that is relatively small (at not a full size AVR). Any suggestions? Ideally under $300.