I have a Vitus integrated amp and separate CD player. The biggest effect was on the CD player. A huge difference on some power cords (Shunyata especially). On the amp the power cords had less effect, many had no effect at all. An improvement in the bass tautness was the main effect on the amp (again Shunyata was the most effective).
Assuming power cords make a difference and a typical system of power conditioner, signal source, pre and power amps there are 16 [2^4] combinations. Double for each additional component TT, CD, DAC, EQ, DSP, etc.
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