Hi all, I sold my Pioneer A-30. It was nice for my second system, but I need somethng stronger (around 50 true Watt at 8 Ohm). Could you please suggest me another amp with usb connection if possible? I need a connection for laptop or pc. So far I have fould the Emotiva BasX TA-100. I would prefer a dynamic amp. It would pair with a Polk Audio tsx220.