Hello, I have 2 Onix Rocket 550s (I know there is controversy regarding this company that is now defunct) that I've had for quite awhile and I'm looking to set them up in my bedroom. I've been out of the scene for quite awhile and am looking for recommendations for a 2 channel amplifier (not receiver although could be fine depending). Just looking for some general guidance. Would like to spend less than $400 and don't want something with an enormously large footprint. Any thoughts? Thanks for your time.