Was thinking about going the separate route, but need to do it one at time. I was hoping to use my current Sony Da 555ES as a pre-pro. I assume I would just connect my external amp via the pre-outs in my sony. I am new at the separates game I was curious do I need to see if my Pre-outs have certain capabilities or frequency ranges in order to connect a external amp. Will the sound from the amp be distorted in any way? Lots of question!!!!!