UPDATE:
Thought I would update my review of the Snubway apearing earlier in this thread. My second Snubway came the other day and I have plugged it into the Zerosurge on which I have my subwoofer only. The other one is plugged into the Zerosurge controlling my other components. Well, let me tell you ... this thing works wonders on a subwoofer (as well as everything else). Bass is very crisp, articulate, and coherent. Having the Snubways in my entire system truly is like having a major component upgrade, and I am about as skeptical of tweaks as anyone. The Snubway reduces line noise substantially and is a product that lives up to its publicity. You’d be surprised at how much noise is on electrical lines and that is generated from switch mode power supplies in your system. My system has never sounded this good, and the Snubway has become a permanent part of my audio arsenal. BTW, I have no affiliation with the manufacturer, I’m just a very impressed and happy customer.