I have a nice little set of bose model 21 bookshelf speakers 10-60 watt, 4-8 ohms, and I'm trying to connect them to my xbox based arcade cab. So basically I am trying to pick a cheap amp, that has a volume knob which I can mount to my cp. It should also have an rca jack, and can be plugged into 110v. It would be great if I could also mount a headphone jack that cut off the speakers when plugged in. I guess I can buy a jank old stereo and tear it apart but I feel like the part I need should be just a tiny box with a volume knob sticking out of it. Helpful advice appreciated thanks!