How do I hook up 2 preamps to one amp


I have a NAD preamp that I use for music. I have a Lexicon preamp that I use for Video. The problem is I have 1 five chanel amp that I need to use for both preamps. When I try to use rca splitters/y adapters, my speakers play at a low volume. If I disconnect one preamp, the speakers play louder. What should I do to allow both preamps access to my 5 channel amp and not have humming or low volume.
kartez
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what Elevick said is the answer - both of his posts.

BDG,

no, he said to run the Lexicon through tape loop which will not work. In fact, I don't really know what that means. How do you "run something through the tape loop"?

What you said will work which is basically what I said.

Perhaps he wants to use the NAD for music because it has a phono section. In that case he could feed the tape out of the NAD to a Lexicon input, the Lexicon preouts to the amp, and use the lexicon to control the volume for everything.

Otherwise I agree just ditch the NAD.

I don't like the idea of a switch either. You need another set of cables and have to build a box to house the switch and connectors unless you want to cut the connectors off the ends of the cables.. It is unnecessarily complicated when there are much easier ways.

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thanks Herman - yes, I re-read his after I posted mine and realized I misunderstood. I agree with you - it won't get to the power amp that way.

The way I described works very well - I used it with a Musical Fidelity Nuvista preamp and a Lexicon pre-pro. It's not as clean as if you have a true HT bypass in your pre - but with a quality preamp you will not notice any difference.
"This is the way I did it" All my parts came from Radio Shack. You can use expensive "audiophile" parts if you desire. First I constructed a small wooden box to house the parts. After I sanded, stained, and shellacked the box; it was quite attractive.

Next I drilled holes for the small red rectangle rocker switch and six female jacks. After installing this, I soldered wires from the jacks to the switch; L & R in from each pre, and L & R out to the amp.

I now use that same box with the 6 female jacks and rectangle rocker switch on another project.
I agree with Herman after all. Why use the NAD at all? If you need it for phono, just sell it and buy an NAD phono. THey are cheap. Go with the Lex only.
I have a similar situation with an older Rotel processor and Denon receiver. I was going to try this method but then thought about the sub. I want to listen to 2.1 but also have the sub available to the Denon for movies. Any suggestions?