The M-80 is in a class by itself when compared to anything Yamaha ever made. I don't think it is 250 watts per channel (can't recall)? However, the first 10 or so watts are class "A" which makes it so nice.
By using a pair of output, ie A & B, you are forcing the unit to use its internal impedance matching hardware. I wonder if this will impede the sound?
Personally, I would bi-wire using only the A jacks with Y splitters and see how that sounds. It may be slightly easier on the amp to use A&B or B&C but you may loose some dynamics??? Your speakers should be quite an easy load on any amp, so don't worry.
By the way, when playing softly, the amp will run extremely hot. That is the class A circuitry. Don't worry. It will only run cooler if you are blasting music and with 93db speakers, I doubt you will need more than 10 watts ever!
By using a pair of output, ie A & B, you are forcing the unit to use its internal impedance matching hardware. I wonder if this will impede the sound?
Personally, I would bi-wire using only the A jacks with Y splitters and see how that sounds. It may be slightly easier on the amp to use A&B or B&C but you may loose some dynamics??? Your speakers should be quite an easy load on any amp, so don't worry.
By the way, when playing softly, the amp will run extremely hot. That is the class A circuitry. Don't worry. It will only run cooler if you are blasting music and with 93db speakers, I doubt you will need more than 10 watts ever!