McIntosh c1100 vs audio research ref 6se vs Ayer KX-R

Johnto
Using a mc255 5 channel amp, chord Hugo tt2, roon nucleus, b&w 804 d3, and a b&w center and sub.   And looking for a very nice stereo preamp with stereo bypass.  Also use a marantz 5014 avr which is fine for ht.

thanks

Why is low impedance of a Mac going into an arc preamp with a high impedance a bad thing?

Tough to find a good expl on google.  Important issue.  Thanks for info.  This is why marketing info from sellers needs to improve in explaining low vs high impedance relationships between components.