How do I hook up 2 preamps to one amp

Herman has it right. Line out to line in always works and tape outs are independent of front panel controls. But based on the rather funky arrangement and weird signal flow, combined with probable tape output selectors, lots of ways to get confused and have no sound (flipping buttons madly trying to get audio until YES full output into the amp). Simple is always better sound anyway, use everything through the Lexicon....It must have a 2 channel mode......

Brad

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Elizabeth,

What he said about the tape loop or what he said about just using the Lexicon?

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If the stereo preamp has a Home Theather bypass input, you can connect the Krell front LR pre out to that input.

When you are watching movies, switch the stereo preamp to HT bypass mode.

My Bel Canto Pre3 has an input I can configure for that.

As for my Audio Research Reference 5 (PROC mode).

Go to radio shack and buy a double pole double throw switch. Connect each pre to one side of the switch and the amp to the center. By flipping the switch you will alternate between pre A or pre B feeding amp C.

what Elevick said is the answer - both of his posts. I'm not sure what Lexicon you're using but it's likely to be superior to your NAD - even for music, but if you prefer the NAD, then what you do is connect the the speaker outputs (ie Main L/R) from the Lex, to one of the inputs of your NAD. This can be Tape in, or any other unused input. When you watch video you pick set the volume level of the NAD to a level that is easy to remember and repeat - for example - 12:00 position. You calibrate your HT volume levels at this setting, and any time you watch HT, you return the NAD volume to this level. This way the volume control of your Lex will control your HT volumes - and pass through the NAD.

This all assumes your NAD doesn't have HT Passthru. This is the safest, lowest cost, and best sounding of all options for you.