Here's what happened. You wrote "a receiver with preamp out to a separate amplifier." Now that you've clarified it, I see that you wrote exactly what you meant. I didn't combine the words (parse the phrases) the way you meant them. I read A receiver with preamp out to a separate amplifier. If you had written "a receiver with* Preamp Out to a separate amplifier," I think i might have gotten it. Words. Damn 'em. Can't write with 'em, can't write without 'em.
*or "using Preamp Out to a separate amplifier" or "with its Preamp Out to..." or maybe even "with its preamp out...."
A good answer is easier with a clear question giving the make and model of everything. "The biggest problem in communication is the illusion that it has taken place." -- G. “Bernie” Shaw