Could I make use of a DAC with my setup?


I stream music (Spotify Premium) from my PC via 3.5mm cable into a Parasound P5 preamp, which is hooked to a Parasound A23 amp, and from there to Klipsch Fortes that I purchased new in 1986, I think. 

I had the impression that if I use a DAC before the P5 preamp, the DAC's output would be "reprocessed" by the DAC in the preamp, and, therefore, useless.

Is my impression correct?  Thanks!
forsooth
Post removed 
I deleted my initial post after reading a little about the P5.

It seems to me that for playing Spotify files there would be no benefit to an external DAC unless the DAC in the P5 is really bad and even then, only if there are input options in the P5 that would allow you to bypass the internal DAC.
Thank you, n80.  I don't think there is a way to bypass the preamp DAC.

If you want to use an external DAC with non-powered speakers (and not headphones), what would be a typical way to do that?
If you connect the external dac to analog in you bypass the dac on the P5 if you connect to any digital in on the P5 you use the P5 dac.