If you put in a CD and music comes out, then you don't "need" a DAC.
The proper question would be "will an external DAC improve the quality of sound that I hear from my system?".
And the answer should be "maybe" or "probably", but the only way to know for sure would be to A/B one in your system and see what your ears tell you.
There are lots of exceptionally good sub-$500 DAC's from Schiit, Music Hall, Cambridge Audio and many others on the market right now, so I'd suggest giving one a shot.
The proper question would be "will an external DAC improve the quality of sound that I hear from my system?".
And the answer should be "maybe" or "probably", but the only way to know for sure would be to A/B one in your system and see what your ears tell you.
There are lots of exceptionally good sub-$500 DAC's from Schiit, Music Hall, Cambridge Audio and many others on the market right now, so I'd suggest giving one a shot.