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

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. 

My take on direct into the wall is some conditioners can't pull the amps for transients or they bleed into the digital if not separated in the conditioner. Because my power at least 2x a wk has problems I can't go direct to wall. To divert that problem I use furman 20 i that has capicitors to provide > 60 amp transients the audioquest has the engineered that designed furman then went to audioquest. He has a magic box ie capicitor of sorts in model 50090 and 7000 that do the same.so far i have not noticed a decrease in sound quality. I have some conditioners i plug the hagel h30a or bryston 28b3 and it will go into limp mode and turn the amp off.i have not had that problem with the 2 I mentioned. I should throw the big shunyata in there as well and not had any trouble.enjoy the hunt.

My 2 cents...

Using a power conditioner with amps may sound good, but given how power draw from transients might limit how the amp is able to produce an accurate reproduction of said power draw.

Utilizing a directly wired circuit from the mains would be, in my opinion, the best way to connect your amps. Adding a whole house surge protector would give you peace of mind should a power surge occur. 

@overthemoon , +1. Contacting McIntosh would probably be the best way to get what they consider the best path.

Bob

Had a Furman IT Reference 15i and it flattened the sound with an integrated Amp. Went directly into wall and the sound perked up. Got an AudioQuest Niagara with High Current outlets and suffered no sound degradation. YMMV to be sure given equipment used. Also have a Puritan Audio Laboratories PSM 156 Power Conditioner and think it’s non destructive to transients.

Yes mcintosh customer service is great.i have 2 of the mpc 1500.each one is running the mcintosh 2 kw even though they tell you run each module off 20 amp line . So I'm using 2 20 amp lines to run the 2kw instead of 6 20 amp lines. Even though power is e x I the 120 volt line does not sag and they pull less than the 12 amp certified for mpc 1500 as they have an amp meter. I've seen the meters swing to 2kw on the amps .they have a 8kw transient but I'm sure I have not hit that yet.that might pop the 2 20 amp breakers. So call mcintosh and ask them but I have not had problems with the mpc 1500. It makes sense they have synergy with thier equipment. Yes I like the audioquest niagra 7000.look at upscale audio in california.the owner interviews the engineer and shows the internals.enjoy the search.