For those of you interested in the same scenario, Nuforce did respond to my question, but he wasn't sure if it would ruin the amp or not. I was told to go ahead and try it, and they would replace it. I wasn't up to that so I return the amp for a refund. Their customer service is excellent. I was not very impressed with the sound of the amp, though. I preferred the original T-amp and its offspring, the Super-T. I have heard that the KingRex is also superb. On the plus side, it has multiple inputs and USB.