IMHO, power cables aren't going to give you what you are looking for. I'd try room placement....and it's free.
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I stuck a large power cable on my REL sub along with PS Audio Power Port plugs for it and the main system (the sub needs its own plug since it's not near the other gear). Not sure the sound of anything got better, but it made me feel better about the AC. Bass "tightness" usually really means less overhang or lingering room sound.