ANNOUNCEMENT -
The whole search is over. I have found the ultimate answer! Low cost, easy availabliity, one-time postage cost to get unlimited improvement into everyone's hands.
I will send everyone a small jar of NCE contact enhancer, and you will go to the supermarket and buy some power strips, and some double adapters. Then you will paint the top one third of all the pins of the double adapters, and plug them into the power strips. Then you will plug the power strips into spare wall sockets anywhere in the house. Best near the stereo if possible, but not essential.
Then you can strip off and throw away all the tape, bricks etc., because you will be able to create as much improvement as you like with several copies of this device. No need to plug anything into the double adapter sockets, just plug the whole thing into the wall outlet and voila.
Here it is:
At the supermarket, the materials to make this cost $22. It sounds better than my $12,000 high end Synergistic Research power conditioner. One small jar of NCE would make 100 of these, because the amount you use on each pin is almost nothing.