If I just use a DAC, do I need a Pre-amp?


I recently asked a Facebook group this same question.  I should have asked audio forum folks first.  Sorry if there is overlap.

If I only use DACs for my amp, why do I need a Pre-amp?
I have the opportunity to get a nice Fisher 400CX-2...but why?

I have volume control on my Fiio M15, and volume via my player for my Chord Qutest.  How will a pre-amp make things better.  


davidgwillett
The Fisher 400CX 2 is a classic preamp if you want it as a vintage piece that’s one thing but if you’re wanting it simply for volume control you could do a lot better buying something newer or having the Fisher refurbished. Your players have volume control is there something in particular you feel that’s missing?
The fear of missing out.  This is a hobby, so if there is some sonic thing that a pre gives me that my music player on my PC or my digital player won't, I'd like to know.   

The Fisher is being refurbished.  I have 1st right of refusal.   I do not need volume control.  The Fiio M15 has a nice volume knob and my Audiovana player and both DACs have filters/mini EQs.  

So I think I am missing nothing.  Except I think the 400CX 2 is beautiful - but that is no reason enough to buy it.  

Clearly, I will need to hear it first, and that is tonight's plan.  Both DACs on the Fisher SA-100 (I have other Amps and don't use a pre-amp).
Part II is I think the  Fisher 400CX 2 might hold its value over time.  So I might loose cost of money, where a modern just-as-good or better preamp would likely loose a lot of value in the near term.