You can use a passive pre if you can't find a phono stage with volume controls; most passives don't have balanced outputs. I think the Manley Steelhead phono stage might but I haven't used one.
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You'll of course need a phono amp. You didn't say what Wadia unit you have, nor is your system posted. But if your Wadia has digital inputs, I'd recommend a high quality analog-to-digital converter (like the Wadia 150) to receive the output of your phono amp and you'll be all set; and without the need for either a Bolder ($$ ;--) preamp, or a more expensive (and probably noisier) phono amp with volume controls.