I use my Chang 3200 for my power amp - Audio Research Classic 30, which I NOT a power hog by any means. I think it makes an audible difference. I use it also for some other gear, but it has little effect there. My Musical Fidelity pre has some mighty good transformers which must clean up the power on their own. My DAC has an outboard transformer of it's own. I've never noticed an effect of power conditioning on my trasnport. My turntable DC motor also has an outboard transformer. Still, the Chang akes a handy power strip :)
TJ
TJ