C.d player with built in Pre amps i.e Wadia

I own the Resolution Audio CD-50 and have used it straight into an amp with good results, the balanced outputs are noteworthy. I'll keep this player until it dies and then I'll either purchase another CD-50 or a CD-55. Bradearles comments about the owner of RA are on the money.

I've had the Pass Labs D-1 dac and ran it direct into my power amps with incredible results. I then ran it through a modded BAT 51 SE pr-amp (a great pre-amp) and was shocked how much better it sounded direct. Since then, I've had the DCS Delius, Audio Aero Capitol 2 and the latest is the Wadia 581SE running direct to monoblocks. I'll never even consider a pre-amp again (unless I win the lotto and go to vinyl). Fully balanced operation (Pass Labs, DCS and Wadia)makes a big difference if you have any distance to travel. I also believe the digital volume when set up correctly is the best sounding. My experience is that pre-amps can add color if that is your goal. But for pacing, separation and ability to handle complicated signals a properly set up dac or cd player running direct is the best cost cutting tool for great sound. Nelson Pass told me that 3 volts from the D-1 would drive my Aleph 1.2's to full output with any length of cable(XLR) and he sells lots of pre-amps. I run my Wadia at 1 volt and can upset my neighbors. Best of luck

Nelson Pass does a nice job of explaining things in an article. You have to go through the wohole thing.
www.enjoythemusic.com/diy/0708/first_watt_b1_preamplifier.

I also use the Opus 21 and still prefer it through a pre.

To clarify my prior response, I have the GNSC modded Opus 21 as well and its a wonderful CDP. When I first got it, I used it as a pre and it did an admirable job; however, inserting a pre into my system really allowed the Opus to do its job as a CDP. The sound stage opened up, etc. Again, this is all system dependent. You have to consider input/output impedences, gain requirements, etc., just as you would in selecting any pre. In MY system a separate pre works better. In yours, using a CDP as your pre may work wonderfully. You will just have to experiment.