synergy

Have I maybe not done enough research to realize that it wont be harmful to run 20ft rca interconnect cables between the amplifier and preamp?

A few years ago, I managed to get a used Aesthetix Io with volume control, that i could connect directly from my player (and on occasion, cd) to my fpb600. I have never looked back ( both for lp and cd this was far better than the KAV 250p i had). They say Cast is best but i don't know, - with my setup a lot of tubes 'massage' the Krell sound to good effect. Getting a full set of new tubes from Aesthetix a year ago was also a big improvement in my case. I've found no need to block dc on the amp, this degrades the sound. I like the IO a lot, very purist approach, I thought I would miss the remote, but never have - and you have balanced in / out.