Ron B writes:
I own both the 820HD and the 720 radios. They both sound the same. Not many stations are available in HD as it just hasn't seemed to catch. Also digital does not seem to be as easily received as the analoque signal. There is one station in my area that broadcast in HD and the signal seems to be very week. However at times when it does kick in, the sound is more like CD quality. No hiss or other noise can be heard.
I already had the 820HD plus several Cambridge offerings and when I saw that the 720 was available at such a good price I jumped on it.
These radios make great amp speaker systems for other things such as satellite receiver or CD players. They sound really good when hooked up to a tv. I own a Sony Dash and I hooked it up to the 720 and what a sound it did make. Although this radio and the 820HD do not have a sub woofer, the bass is amazing. The radio emits clear and undistorted sound. A great bargain...
One added feature on the 720 is the stations and clock do not get lost when you unplug the radio. One the 820HD it did loose the information. The radio does not have a battery backup either. It just remembers the time and stations without a battery.