I have been using Gutwire 16 cords but just bought some last generation PS audio cords, 2 Statement SCs and 2 xStream Power Plus SCs. They work very well and are available at good prices right now. I have not had them long enough to fully evaluate them to see if they would give the effect you want. I am not sure that I would be able to in any case as systems and rooms vary. If you have not gone to dedicated lines yet I would try that first but I assume that you have. Something I did that gave exactly the effect, IN MY ROOM, that you describe was to put threaded Star Sound cones under the Subs. It made the bass leaner and tighter. Probably cheaper than a PC and it looks like you have a good PC already. I am not using them at present as I just put in Ready Acoustic panels and got rid of excess bass and am still realigning the bass units for new room configuration [you can't move the subs easily on spikes]. The Ready bass traps are another solution for bass problems,they work well. I liked the Star Sound products so well I became a dealer but I don't sell on the internet. I did not get the REL spikes with either of my subs so can't tell if they would give the same effect but doubt if they would given my experience with substituting the SS in other applications. Hope this helps, the REL is a great Sub.
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