Running extension cords is not a good idea... especially to the amplifiers.
What you want to do is get your rack out of an area that reinforces the low bass, i.e., into a room null. You might be able to do that by simply moving the rack a foot or more from the wall. Of course putting it in a corner or next to the subwoofer is not good. Having a giant TV screen between the speakers (large reflective surface) is not recommended either.
I'd put on some music (or test disc) with copious low bass and then put my head where the rack is and see how much the bass increases there. Then pull your head away from the rack and wall and move the rack to the point where that bass build-up abates somewhat. Happy listening.
What you want to do is get your rack out of an area that reinforces the low bass, i.e., into a room null. You might be able to do that by simply moving the rack a foot or more from the wall. Of course putting it in a corner or next to the subwoofer is not good. Having a giant TV screen between the speakers (large reflective surface) is not recommended either.
I'd put on some music (or test disc) with copious low bass and then put my head where the rack is and see how much the bass increases there. Then pull your head away from the rack and wall and move the rack to the point where that bass build-up abates somewhat. Happy listening.