Run direct from ML 390s CD player without preamp?

I think you would be surprised how good it would sound. The #390s is very flexible. It also offers an upgrade path in that you can go from just the #390s to using a preamp, then use the #390s as a transport using a seperate DAC, and then if you ever have a breakdown with any of your equipment (as long as it is not the #390s you can use it to replace everything in your system except your amps.
I used the #39 for a long time and the #390s is sounds better but offers all of the above advantages.
The #390s preamp stage works in the analog realm and should have no problem driving your preamp. ML also uses a proprietary method to make this work and is one of the few that gets the job done with no apologies.

Good listening!
sgr (Steven)

I currently run Rogue M-150's direct from an ML 390s. Absolutely no problems. I ab'ed it against several preamps and the bottom line is you will have to spend a bunch to better the quality of the volume control in the 390s, particularly if you run a balanced connection from the 390s to the amp.

Can somebody explain this Output Voltage and Output Impedance matching with the amplifier? My CD player is an RA Opus with 5.0 Vrms balanced and 2.5 Vrms single-ended for Output Voltage and 100 Ohms for Output Impedance. My amp is a Plinius SA 102 with 47K Ohms Input Impedance.

What exactly am I looking for? What is best...worst?