Here are the amplifiers I purchased to replace the ARII boards. I made a couple brackets and mounted them where the old volume pots were located. They are Qkits, and are overkill by far. You barely have to turn the volume to get the sound where it needs to be. The volume leve is definitely easier to control now though. With the original pots and ARIIs it was either loud or nothing. A cheaper way to go is by hacking a set of cheap PC speakers similar to what is done by many, myself included, for PC based machines, however I did like keeping the volume controls separate for each channel and these kits came with volume controls.