If a power cable changes the sound of the amp perhaps your "Ayre Conditioner power line RFI filter" is faulty.
I see. So the conditioner has the magical property of making anything plugged into it sound the same. Power cords no longer matter. Interesting. Tell me more. So I could use lamp cord, or extension cord, it can't change the sound, it would sound just as good no matter what? There is nothing anyone can do after the conditioner that can affect the sound in any way. Not unless the conditioner is faulty. Is that right?
Are you sure you have thought this one through?