Installed the P20HD. It is working well, however the sound when it switches from FM1 to HD is terrible. The sound on the HD channel is approx 50% lower than the FM1 or analog channel. The sound also seems like the speakers/singers are standing in a hole. The "s" sounds are very harsh and drawn out, the sound is plasticy, and there is an echo type sound. (For all you younger Hi-Fi Harry Potter geeks, it sounds like I am playing AM, out of phase, and the speakers are speaking Parsel-tongue.)

Switching from HD1 to FM1 is so noticeable, it is annoying. I'm running RCA cables to an Alpine amp to Alpine X series components, so I know it is not the rest of the system. It happens on all the channels, not any specific one. Music or talk-shows. Mostly I listen to ESPN, but it happens on all others. I have checked my EQ settings - they are the same as the regular radio.

Any ideas??

Tom

It may have something to with the HD tuner never being officially supported by a three year old unit.

Um, no.

The AVIC-D3 is advertised as HD Radio Ready. This is Pioneer's HD radio solution.

Yes, it is an external tuner that has limited function. But if it was an incompatibility, then it wouldn't work in analog, or digital mode either. Now, it is just a sound difference when the tuner switches over to HD.

Anybody else have any useful input?