Wow! HD-2 & 3? Well, that ought to cut down on the sound quality even more on their main channel. I recall that early on, CC thought they could run 3 channels on FM, but it lowered the quality so much on the main, they gave up on the idea. On AM if you ran an HD-2, the audio on the main drops down to phone line quality, according to a brilliant engineer friend of mine who installed about a dozen Bay Area HD transmitters.