Yamaha Amp M 35 with Carver Pre Amp C 2 ..?

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.

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.