Assuming that you have digital out from your CDP (otherwise, the DAC would unfortunately be of no use), you would connect a digital cable from the digital out of the CDP to digital in on the DAC, then analog out from the DAC to any line level input on the pre.
How do I connect Benchmark DAC
Just received Banchmark DAC1. I have no clue how to connect it to my equipment. I have a preamp, power amp, CD player(s) and non powered speakers. Connections are RCA and have no XLR's! I don't have any dedicated interconnects for the DAC, but am in fast pursuit of Analysis Plus Digital Crystal(RCA) which I have researched and ultimately selected. Okay, so now what? Baby steps please. I have determined that I want to use the RCA's Unbalanced on the DAC. I have 1 CD input on my Audio Research Pre. Where do I go from here? I want to use the CDP as the source. Please enlighten!