Terry, Why dont you start by just compring the 'as issued' Levinson lead with the 'aftermarket' lead. If you can really hear a difference, then fine. If you can't, that should arouse your suspicion.

Next try just running the stereo and switching everything else in the house off and see if that really makes any difference. If it does, I would be straight on to the Levinson factory asking them why they had charged me so much for a piece of kit with a crap power supply.

After that do phone the Levinson factory (not their UK witchdoctor) and ask them why they have provided such a cheap and nasty power lead with their high quality equipment. I wouldn't mind betting they tell you that their lead is all that is required.

Also remember that once you have bought and installed your new wiring system, you won't be able to remove it and get a full refund for both the cable and the labour will you.

All the best