Well you know the old expression, a fool and his money is easily parted. Instead of waisting money on such nonsense, put into the the upgrade of gear or room acoustics. The single biggest player in sound next to the speakers are room acoustics. Treating the room would have a much further reaching affect.

If I could do a proper DBT test I would. Last year at this time I exchanged out a Technics DX940 receiever for a Yamaha RX-V1800 and I thought I heard tighter bass and a more open soundstage. But the problem is, it took me 3 hours to exchange the receivers and any audio memory accurcay is shot in an around the 2 minute mark. What I would have loved was to be able to the DBT test to see if I actually heard a difference or just perceived to hear one. The only difference I do notice without a DBT test is that the Yamaha can keep on going in power levels where the Technics was running out of gas. This was observed through a Radio Shack SPL meter and I took note of the readings. Other than that, I don't trust my hearing becuase I also hear with my eyes and the RX-V1800 is beautiful sight in my mind.