Extension cord question

I see no reason why you couldn’t do this but don’t scimp on the cord or voltage drop may become a problem.An alternative is to put new outlets in the listening area using Wiremold surface mount  parts.

Why not just have an electrician install one or two dedicated lines to your system. That will solve the problem and improve your sound quality.

As a Wa./Co./Tx./Ca. Certified Commercial Journeyman Electrician & someone who has run a service truck, I can tell you dedicated line installs are going to cost you a min.of $50.00 an hour depending on where you live.Installers won’t hurry either,especially if pulling new circuits through existing construction. And heaven forbid they should have to enter the crawl space or attic.Any homeowner with half a brain can get all the info online,pick up parts at HD & save the labor charge + the 100% markup service electricians charge on parts.