AC captive cords???

Eldartford,

It's important to note that the bills must be the older, 'uncolored' versions. The dyes in the newer bills increase dielectric absorption, and will result in significant coloration in the upper to upper-upper googlehertz region. Of course it can be difficult to hear the difference if your system isn't tweaked properly. I find isolating my loudspeakers from the floor with short stacks of 100 dollar bills really increases the dynamic slam and midrange bloom, especially when listening to vinyl that has been properly 'burned in' by repeated playing for a minimum of 25 years.
As always, YMMV.

(Thanks for letting me play, I needed a good chuckle today)

Um, just to be clear, I was just having some fun with what Eldartford said. Sometimes we need a laugh in this 'serious' hobby. I'm a firm believer in power cables. For a serious answer to the original question, I had a similar issue with the captive power cords on the Marantz MA700 mono amps I use to drive the subs in my HT rig. I replaced them with cryo'd CDA 101 copper wire of 13 gauge net, and I did notice a small improvement in lower-bass punch. Of course the original factory captive cord was only 16 awg, so that probably explains most of the difference.