Is it OK to leave AV Receiver on?

Leaving the AV receiver and amp on will not cause damage. Most are set up to use minimal power while on and are safe to put into standby mode. It is often seen as good practice to turn the system and components off between uses. It will not harm your system if it is left on, though.

Is it bad to leave AV receiver on?

Leaving the AV receiver and amp on will not cause damage. Most are set up to use minimal power while on and are safe to put into standby mode. It is often seen as good practice to turn the system and components off between uses. It will not harm your system if it is left on, though.

Which is better Marantz or Yamaha?

The marantz is the top of the line model, while yamaha is 2nd to the top. If youre planning to run external power amplifiers, the marantz receivers usually produce more VRMS for the preouts. Another thing, audyssey downsamples HiRes audio, while YPAO doesnt.