Audiophile pre-amps with home theater pass through

Krell KRC-3, the S-3 input can be configured for unity gain.

Adcom GFP 750 (good) at about $700 =/- used, or Muse Model 3 Signature (significantly betters the Adcom) at about $2300 new (you will not likely find it used). The BAT SS pre amps like VK40 I believe have it, and the tube units have the unity gain as posted above - be sure to ck features on the specific model you are looking at. It is a great feature if you only have one listening/HT room.

Audio Reserch SP16 All tube too!

Proceed PRE is a good ss preamp w/ pass through and is selling very cheap used now since Proceed is being incorporayed into the Levinson line.

Can someone elaborate on what the unity gain feature of the BAT pre's is/does and how it relates to integrating a home theatre system into a two channel hi end system?

thanks