basic passive preamp

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loomisjohnson1 is right on.  Get the Luminous Audio Axiom.  Very inexpensive and it sounds outstanding..  It has the 3 inputs that you are looking for.
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Looks like the luminous is perfect - is the sound quality comparable to say a Tortuga or a placette?  Also, I would imagine there aren't many of these on the used market - should I purchase direct through the manufacturer?

These are superb low cost passive pre amps-

http://www.tisburyaudio.co.uk

Passives don't work nearly as well as active....If you insist, build one yourself.....all you need is a volume control, some wire, and box to put it in. 

"Passives don't work nearly as well as active..."


What...??? Music First Audio's Baby Reference blows many actives out the water.