What are you going to hook to it?
this is what I use, Emotiva doesnt sell it anymore, since they are moving taords the higher priced electronics lately.
But It works awesome... with music audio I like the shortedt possible path, I go from my pure i20 dac to the xda1 to my amps, you can hook cd players and other inputs up to this, but you want to use digital devices, so make sure your cd player has an optical or digi output of some kind... It also takes usb directly from your pc..
I havent seen one of these on ebay in a while, and this week 3 showed up!!! Last one I seen sold for $250...
Emotiva XDA 1 DAC Preamp in "Like New" Condition | eBay
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thats mine matches the emo amps perfectly