I recently purchased off Ebay a used SIRPNP2 Audiovox to replace the exact same model. The seller claimed it worked fine. When I put it in the car dock and hook it all up the same way as the other one, it came one and I could see all the channels and the current song or program. No audio. Not even on channel 184. I heard that channel 184 only works as a preview with NEW radios. I called Sirius and tried to activate it. They said they sent the signal and I should see 'Updating Streams'. Never saw that, then the Rep made the comment how old that radio is. Then they tried to sell me a NEW radio. It's true that the radio may be dead (I don't know for sure), but it sure seems strange.