I almost gave up on this mod and tried a power cord today that a friend had laying around. The difference was startling! Before trying this different power cord I was getting very little bass and the music had a distant quality to it. This has all evaporated with the new Power cord. I spoke with Paul of TRL today and he confirmed that this unit is extremely power cord sensitive. I am going to purchase one of their power cords to insure that I am hearing the unit as it was meant to be heard. I am anxious to get feedback from others who have done the battery option.