Todd, not being "officially" rated for 4 ohm operation should almost never be a concern in home audio usage. The FTC power rating regulations require that receivers and multi-channel separate amplifiers be driven with at least two channels operating simultaneously at the full rated power for at least five minutes continuously. This laboratory test is something that would never occur in ordinary home use.
Any receiver or separate amplifier can be forced to shut down with any impedance speaker if it's driven too loud for too long, but yes, the 3808 should be more than adequate for your needs.
