SPT-500 VS Imax with GP kit

[Needle Bender]

excellent report needlebender.and results is what id think they would be. my only question
is how is the floor noise level compare on the GM vs the imax? being both fiberglass
and two how does floor noise level compare against the GM vs the p-500

That's another nice thing about the Gainmaster, like the SP500, it's also got a DC ground path and is as quiet as the SP500 if not even a little quieter.
A local sidebander claimed that he heard an increase in noise on his Imax when he added the radial kit. Makes me wonder if maybe the Gainmaster really is quieter than the SP500 due to not needing or having radials.