As to advantages, a 4-ohm speaker presents less resistance to the flow of current from an amplifier compared to an 8-ohm speaker, so the more current that flows, the more power is pulled out of the ...

When in doubt about a 4 ohm speaker's compatibility with a receiver, check with the speaker's and/or receiver's manufacturer. If your speakers are rated at 6- or 8-ohms, and most are, don't worry ...