If you have tried Synergistic's new Element series cables in your system then you ears will tell you, like mine, these are the best cables out today. I would like to recommend to try Synergistic Research Element Tungsten Power Cord on your Rel B2 Subwoofer. I have owned this subwoofer in the past and I have demo'ed HD P4 and Valhalla power cords through The Cable Company. And the Synergistic Research Element Tungsten Power Cord was the clear winner. Take a look at their website for the specs and links to many reputable websites with very positive reviews. The Cable Company has this cable on their used website for 30% off. An excellent deal and much cheaper over the other 2 PCs plus many others I've tried. You can return it if you don't like it. S.R. New element series blows away any HD power cord I tried. Including the P4. Then there is the Element CTS Rel Spec reference interconnect. This cable is THE best for the Rel and compliments the Element PC excellently. And so does the lower costing Element Tungsten Rel Spec interconnect. This is just my opinion, I just recommend trying the S.R. PC on loan from The Cable Company. I've been using Rel Subs for years and tried them all. But S.R. always sounds the best. Have Fun and trust your ears. Thanks.