I agree w/Albert and others who no longer use power conditioners. I used 2-3 mid-priced power conditioners in the past and 1st, none could handle my big McCormack DNA-2DX amp, and 2nd on other components they sometimes changed the music quality/character but never improved it. Since then I've installed a dedicated AC system and am convinced that's the best way to go when possible-- but then we own our house and I can do that. I consider good outlets and power cords an extension of the ded. AC supply.
If we rented and couldn't put in a ded. AC system, I'd seriously look at power conditioners if I thought they might be beneficial-- PS Audio, Hydra and the like. Finally, I've had discussions with Steve McCormack about this, and his advice has always been to plug his amps directly into "wall AC". Cheers. Craig