basic passive preamp

I use a Promitheus TVC,paired up with a pair of Monarchy Audio sm70mkII's with great success. This model has 4 inputs,2 outputs,and a 6db boost.( I keep it at 0 )

Thank you - in response to the question source is nad cd player and amp is nad 2600, but those may change.  George I didn't understand your post re what are on ebay for under $100.  And how does the sound quality of the Schitt compare to the others including the tortuga?    

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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