dxer720 said:
I was interested in the better quality of the AM (as I listen to WGN & WTMJ) & the subchannels of the FM HDs.
Interesting phenomenon on HD AM. I have a music format near me on AM - Radio Disney. I am familiar with some of the songs, having heard them when the local outlet was in full fidelity C-Quam. One of them has a high frequency "ding" several places in the song. In HD, the "ding" was back - but severely shifted in frequency (pitch).
It also sounded really sinusoidal - no harmonics. That tells me right there that some of HD radio's extended frequency response is extrapolated and not real. So it may sound great to some people, but not if they are really familiar with the song from CDs or FM.
As far as first time purchasing - I'd go with a cheaper receiver and a more expensive outdoor antenna if I had a limited budget. HD-1 will NOT sound any better on those trendy table radios, the difference will be masked by the tiny 3 1/2 inch speakers. On a component quality tuner like a Sangean HDT-1x, the degree of digital improvement will be noticable if the rest of the audio system is decent. It can be a dramatic improvement - but a critical ear can detect compression artifacts - especially if there are multicasts.
HD-2 can be nice if there happens to be a format you like, but it is a compressed audio format at best.