Please teach me something

Instruct me on the use of external DAC's . I understand what they are and what they do but I don't understand how to use them with a stand alone CDP .

Do you connect the ext. DAC to the analog out of a CDP thus doing the digital to analog thing twice ? Or do you connect to a CDP's digital out , if so equiped ? Many are not .

In the case of the former (connected to analog out) , wouldn't the CDP's DAC's alter the final outcome from the ext. DAC thus giving a different sound for each different CDP used with the same ext. DAC ?

Thank You .
Take the digital out from the CDP. That is the only way to do it. If you don't have one you are out of luck. Analog output(s) don't have a signal the DAC can decode.
Yep, as Newbee said, the inputs on a DAC are all for a digital signal and, depending on the particular DAC, those inputs may be coax, optical/Toslink and/or USB.

CDP's have two main components inside one box, a transport to pick up the data from the CD and a DAC to convert it for output from its analog out jacks. If it also has the provision for digital output the internal DAC is bypassed and the digital signal made available at the digital output jacks, commonly coax and/or optical.

The digital signal going to the DAC may come from a CDP, Squeezebox, Airport Express, Sonos or anything else that's got the output.

The output of the DAC is left and right channel analog signals, suitable for input to your preamp/amp.
Just to oversimplify, DAC stands for "digital to analog converter". We don't listen to bits and bytes or a series of 0 and 1 (digital). We listen to a continuous waveform (analog).

The information on a cd is digital, and the DAC converts it to analog. As stated above, cd players have built-in DACs. If you go from the cd players digital out to an outboard DAC, you bypass the cd player's DACs and you can alter the sound of the translation from analog to digital. Like other equipment, each DAC has its own sound (although many differences are subtle IMHO).

A computer soundcard is also a DAC, for example, because it converts digital to analog.
Ok , thank you much for the lesson .
That was what I thought but wanted to check to make sure .

You people sure are great !

Happy tunes .
The other guys nailed it.

Good luck!