Another Next Best Tweak

Well, it seems none of my Audio chassis are magnetic.
I did try a set on one of my power cords, and it seemed to thin out the sound ever so slightly.

My best option was placing three, on the back side of my
amp's transformer. The magnets don't "stick," as much as they
just stay in place. They are from Monster Magnets,
www.magnetsource.com
They are circular, with a hole, measuring .74 in od x .375 in id
x .105 in thk. These were the biggest ones in stock at a
local electronics store, $15.99 for three.
In my opinion, equal to or better than a cable or power cord upgrade!

Sgordon, What would you call the back side of the transformer? On the windings or on the frame?

I just tried some magnets on top of the transformers on my Cary 306 Pro and they seemed to thin out the sound.

The back of the transformer is the farthest point from the front of the
amplifier, with magnets placed on their side. Since the magnet is shaped
like a tire, the contact point of the magnet is like the side that faces the center of the car at all times.

On my Marsh A400 there are five wires
that go from the top of the transformer to the circuit board.
The three magnets are placed (clock analogy) at ten, twelve
(the center of the group of wires) and two.
This sounded better to me than placing them farther apart,
at eight, twelve, and four, for example.

When I remove the magnets after a while, I can feel
them continuing to vibrate in my hand for a few seconds!

I agree that placement on top thins out the sound. On my unit,
the magnetic attraction is very strong on top, and relatively weak
on the sides!

I me enjoying the WA Quantum transformer chip placed on top
of the transformer. Have you played with these, yet?