Thanks for the feedback Rusty. I have followed RELs advise for connecting to a Class D amp. Connecting line level really isn't an option for me. For one, I am not going to be running another 2 X 30 foot RCA cables from the output of my pre amp to the location of the two RELs. This will add cost, and raise the output impedance of my pre amp - not that it really matters with the EVO Ones 1'sMOhm input impedance. So for me it is more about convenience of connecting to each Monoblock nearby.
There is no increase in noise whatsoever. In fact, within about 30 minutes, I had the two carbon subs dialed in, and they sound GLORIOUS!. I own Von Schweikert Speakers, and when Albert was alive he always recommended going into subs via high-level to maintain the sound. I actually would like to compare the difference between RCA and High-level, just don't have the ability to do so right now, and really don't want to run 30 foot RCA cables. The balanced out from my pre is feeding the amps directly
. What's nice is that the EVO Ones have a grounding nut at the back.
THanks
Lou