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

contrary to ghd prentice there are a wide number of power conditioners that don't limit current at  all

these include audience audio magic and Isotek

in fact we demoed  a particular power conditioner with a krell krs mono block 

and there was zero degradation 

to date we have tested synergistic, shunyata, running springs, silver circle,audience audioquest, audio magic,and isotek, ps audio exact power and a few others

in all cases power conditioners elevated the sound of our reference system the differences were how the sound was improved they all differed in the way sound was improved.

Summation all passive conditioners made a greater improvement then direct wall hook up, 

all passives were better then active devices.

dave and troy

Audio intellect NJ

In my experience, I have great results running my complete system through my Puritan PSM156. I use two actually.

Everyone ' power situation is different.

My personal experience with power conditioners.  For years and years, I ran all my amplifiers straight into wall outlets (using upgraded audiophile wall outlets).  I plugging my amps straight into the wall outlets, and not into power conditioners, because it was the prevailing wisdom in the high-end audio/audiophile community, so I just followed suit and went along with the crowd.  But one day while visiting one of my local high-end audio shops (who sold mega-buck caliber audio gear), I was introduced to a non-power restricting power conditioner that actually enhanced the sound by just removing the noise and grunge, while actually not restricting it’s power or current.  I was so impressed by what I heard from that power conditioner, I was inspired to investigate further, so I began experimenting with that power conditioner, the one I heard at the high-end audio shop, and also various other power conditioners that were advertised as non-power restricting.  In the end, and after extensive and exhaustive A/B comparisons, I found that I got better result when plugging my amps into a power conditioner and not directly into the wall outlet.  But it was still critically important for me to choose the right (so-called) non-power restricting power conditioner, as they are not all created equal.  Ultimately, I selected the Audioquest Niagara 3000 as my reference power conditioner, which my power amplifier is plugged directly into one of it’s high-current outlets.  I’m extremely pleased with the Audioquest Niagara 3000 power conditioner which, in the future, I’ll always plug all my amplifiers directly into such a device. Oh yeah, I also made sure I used a very high-end, quality power cable from my upgraded wall outlet, to my power conditioner.  Happy listening.        

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.