After reading this article: https://positive-feedback.com/audio-discourse/subwoofers/, I replaced the extension cord going to an short Signal Cable power cord I have going into my Martin-Logan BF210 sub with a Signal Cable "extension" cord I had. Much like the reviewer found, the mids and highs improved with the bass.
Looks like you can buy their 15 ft 10 awg cable for a little over $200.
http://signalcable.com/magicpower.html
Looks like you can buy their 15 ft 10 awg cable for a little over $200.
http://signalcable.com/magicpower.html