I just bought a WK-220 as a starter unit for me. It was a good price but has week sound from the speakers (the headphone sound is good) but the specs say the amp has 2.5watts ea so that is not a surprise. This unit does not have ext speaker outputs or standard analog outputs (red and white) but it does have both the headphone outs and a USB out. If I feed ext speakers from the headphone out with a splitter, is that enough wattage to run them? I would think the headphones outs are run at a lower power to avoid damage. Also is there a way to use the USB directly in to a stereo amp to speakers or do I need to take it apart and find the "preamp" output internally to go to an external amp? I am a fair tinkerer but I would prefer to avoid getting into the internals if possible.