#1 Move all the stuff from in front of your speakers. #2 Use very heavy gauge speaker wire, at least 10 to 12 gauge. #3 The more power the better, 200 watts/channel minimum. I would also agree that you may want to go with separates eventually, but the NAD should work fine for now. I do not agree with the comment that a preamp is as important as the power amp, speakers #1, power amp #2. Good luck.
Power Amp Question
Question: how to match a power amp to my system using an integrated amp as a preamp.
System:
Triad Gold LCR In-Room Speakers 4-OHM 100-400 watt
Audio Tecnica AT-OC9XL Dual MC cartridge
NAD C356 integrated amp
Rega Aria MK3 (recently added)
Thank You
G