Dual purpose amp

As long as your amplifier has an input selection switch, you can have them both connected and also sending a signal, and switch between inputs.

Two caveats:

1. Depending on the amplifier's circuitry, you may get noise or signal bleed from the unselected input.
2. If the amplifier manufacturer didn't implement the input selection properly, then something very bad could happen. Generally speaking this shouldn't be an issue.

I don't understand why you'd want to connect an AVR to an amplifier. What are you trying to do?

@cleeds 

Some people don’t know the difference between an AVR and an AVP, some just use the terms invariably, like I use to 😀