I saw a review on Audioholics where he found the DBS added capacitance to the circuit, so it is doing something measurable. While most would not want to add capacitance, it could, in certain cases, alter the frequency response. In theory at least.
Audioquest Power Cords
I thought I post this. I had an Audio guy wrote me to tell me to disconnect the DBS 74V from the power cords and see what I thought. Well, I tried it and wow the impact was huge, with more real presence, weight, detail, and more natural sounding. They sounded really good before but now like a new system. Still open but now with more body to the music, bass more solid, less light in the mid-bass. Anyone who owns the AQ cables with the DBS, give it a shot and unplugged the battery pack, and see what you think. I like it on the I.C. and speaker cables though and there I keep the DBS plugged in. But the power cords are a different story.