Approx. 1 year ago, for my stereo system, I bought 5 new 6 foot ifi NOVA power cables as a bundle for $680 out the door including shipping from a private dealer on Audiomart to replace all the stock power cables. At the same time, I also put in a audioquest duplex outlet. I made these changes all at once, and I can tell they did make an improvement in sound. I would say smoothness, soundstage was improved, maybe also bass, but, not sure on that. Note: I also updated all my interconnects and speaker cables about 8 months later with OCC copper interconnects and huge low gauge IFC copper speaker cables. This change made a more positive difference in the improvement of my sound than the Power cables. Any harshness was gone, bass was greatly improved, and soundstage was also improved. So, my point is, I would improve the speaker cables, interconnects first, then, the power cables..... In addition, if you are running tower speakers (ie. lots of bass) with long lengths, then, inmho, the most important upgrade is thick low gauge speaker cables. I am using 7 gauge per speaker, approx. 3 or 4 gauge per speaker connection and 12 feet of length. Of course, the longer the speaker cable length, the more the lower gauge makes a difference. I hope this helps you.