The M series amps are great. I've had many different versions. This is the bottom of the barrel. You are going to cook it with 4 ohms. Yamaha historically has never liked low impedance.
You need a better preamp than that Carver which is very low quality even though it has great specifications it will not sound good in a proper Music Reproduction System Bob Carver is one of many designers who does not comprehend, understand, or grasp the properties of sound which is necessary for components so used within.
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