Hi there. I have four 18 Sounds mid-range speakers (two 6 inches and two 8 inches) and need an amp that will bring out the beast in them. A friend advised me that a 4-channel amp should be perfect. The speaker models are 6ND410 (180 Watts AES power.....240 Watts program power....480 Watts peak power) and 8M400 ( 250 watts AES power....320 Watts program power.....650 Watts peak power). Please advise ASAP THANKS!!!