Yamaha A-S301, two channel, Hi-Fi amplifier up to a total of 2 x 100W at 8Ω and high dynamic power per channel 100W at 8Ω, 120W at 6Ω, 140W at 4Ω and 150W at 2Ω.
The M2si delivers 72 watts per channel into 8 ohms and 137 watts into 4 ohms. This means the M2si will drive a wide range of speakers, even power-hungry models.
Yamaha A-S201, two channel, Hi-Fi amplifier up to a total of 2 x 100W at 8Ω and high dynamic power per channel 125W at 8Ω, 150W at 6Ω, 165W at 4Ω and 180W at 2Ω.