Thank you for chiming in, Al. I confess to being confused myself as to how connecting the line level front L/R outputs of the receiver to the extra output of the Meitner preamp would work; seems improbable. Nonetheless, the idea seems to be that this allows the Meitner to remain connected to the front mono's for critical music playback, and that for video, the two outputs of the Meitner, being connected in parallel, would allow the front L/R line level signals from the receiver to "pass through" from one set of RCA jacks to the other set which is permanently connected to the two front amplifiers. Please shed some light on this.
As I think about it further, why not simply send the receiver's two front channel signals to one of the aux inputs on the Meitner, which would send it to the front amplifiers? The Meitner has the capability to adjust the volume of each input relative to the other inputs. Would the volume of the two front channel signals not be controlled by the volume control on the receiver as it passes through the Meitner?
As I think about it further, why not simply send the receiver's two front channel signals to one of the aux inputs on the Meitner, which would send it to the front amplifiers? The Meitner has the capability to adjust the volume of each input relative to the other inputs. Would the volume of the two front channel signals not be controlled by the volume control on the receiver as it passes through the Meitner?