The problem is the wall wart...at least in my case.
I had the same issues...annoying hum if the gain was turned near half way, radio stations being picked up, loud clicks coming through when I switched on a nearby light, etc.
I spoke to Bellari, i.e. Rolls, tech support yesterday (1/30/09) and a guy named Justin said they "had a run of bad power adapters". He asked for my adapter model number, then said he would mail an upgraded one right out and gave me an RA number to return my current one. Turns out, I had one at home that matched the same specs, and tried it and all problems solved!
I had the same issues...annoying hum if the gain was turned near half way, radio stations being picked up, loud clicks coming through when I switched on a nearby light, etc.
I spoke to Bellari, i.e. Rolls, tech support yesterday (1/30/09) and a guy named Justin said they "had a run of bad power adapters". He asked for my adapter model number, then said he would mail an upgraded one right out and gave me an RA number to return my current one. Turns out, I had one at home that matched the same specs, and tried it and all problems solved!