Photonman - when current is dumped from the amplifier to the load, the amplifier reserve has to be re-charged, and the quicker it can be re-charged the faster it can dump current. This is the reason a power cord matters. Audition a high silver content conductor, and for sure the geometry has to be twisted to prevent RF.
More surprisingly, and I'm not sure how this works yet, try placing a VPI brick near your outlet where your audio power cords enter the wall. Have someone move the brick away while you are listening, and then move it back to the floor approximately 6" away from the outlet. Hear the incredible change in the sound stage. Don't know why it happens but boy is it an eye opener. While I agree with plugging a power amp directly into the wall - it appears some kind of filtering is advised. The VPI brick won't affect high current flow and seems to improve the situation somewhat. But this is why they sell $6000 power conditioners I'm sure. (Not that I can afford one.)
As onemug states - all of this is probably greatly affected by the quality of your power. I live in an apartment in NYC :-(.
More surprisingly, and I'm not sure how this works yet, try placing a VPI brick near your outlet where your audio power cords enter the wall. Have someone move the brick away while you are listening, and then move it back to the floor approximately 6" away from the outlet. Hear the incredible change in the sound stage. Don't know why it happens but boy is it an eye opener. While I agree with plugging a power amp directly into the wall - it appears some kind of filtering is advised. The VPI brick won't affect high current flow and seems to improve the situation somewhat. But this is why they sell $6000 power conditioners I'm sure. (Not that I can afford one.)
As onemug states - all of this is probably greatly affected by the quality of your power. I live in an apartment in NYC :-(.