Yes you will hear a significant improvement at this price point. There are many budget friendly DAC's which will greatly improve your sound.
Upgrading to a stand alone DAC
I have the upgrade bug..lol. I am considering purchasing a stand alone DAC as 60% of my listening is thru my CD player (NAD C568). This was purchased new 3 years ago for $799.00. My budget would be $1500. Rest of system is the Marantz Ruby KI integrated amp and the Reference 3A de capo speakers. Would I hear a significant difference at this price point?