When using a power conditioner, why is it advised to run amps directly to the wall?

Lower power amps can be plugged into power conditioners which may improve their performance but big amps need to go directly into the wall to give them unlimited headroom.

In any case, if in doubt get a demo.

I demo'd many over the years through lending library at Cable Company, didn't find a single one that didn't limit current to some extent, this includes passive and active. This also compared to my own BPT 3.5 Signature witch has a massive Plitron LONO balanced transformer which also does same even when I run it on the amp/bypass circuit.

These comparisons mostly done with 845 SET amps which demand much current. To this day no PC for my 845 or 300B amps, I run my amps alongside 2 REL subs from a single dedicated 20 amp, 10AWG circuit, don't need or want PC here.

For those of you claiming they limit current, did you have a way to actually measure that or was it by what you thought you heard?

I read a review of Moon amplifier where the company recommended plugging directly to the wall and encouraged the reviewer to experiment. 
 

I have tried plugging into the wall and through power distributor (Shunyata). I prefer my amp plugged into the distributor. 
 

Your system has 3x the amps I have though - consider emailing McIntosh and asking there recommendations. 

Thanks for all feedback everyone. The issue seems to have many opinions dependent on many different situations.

 I have had literally everything in my rack plugged into the Mac power center for nearly 16 years plus I just added a big powered sub a few weeks ago. It sounds great and I have had no problems at all. BUT, I think I will take the suggestion above and contact McIntosh to be sure.