Hi Hawkson101,

The advice on the Audioholics link is solid. If the power supply in the receiver is robust enough, you could connect a 4-ohm surround with 8-ohm fronts or vice-versa. As long as the voltage and current supply is sufficient to the various on-board amps, then the receiver should drive them easily.

If these conditions aren't met, the protection circuitry will shut down the receiver or limit current output. You won't damage anything.

Regards,

Alan Lofft,
Axiom Resident Expert (Retired)