Anyone using attenuators with mac mc275?

I am using endler stepped attenuator's on the inputs of my cj power amps. they are very good and very transparent.
have a look at the web site.
http://mysite.verizon.net/vze4c5pt/id2.html

I had asked McIntosh about doing that and was told not to - you can but at lower volume levels it's going to sound bad - and distort and it does. I just bought the C2200 preamp which arrives today.

I have not found my endlers to distort at any volume setting.
I did not find the rothwell attenuators to distort, they just were not that transparent.