Squeezebox and Theta DAC

hey there everyone!
Have the Squeezebox up and running with a Theta Pro Progency A DAC - now that DAC is probably close to ten years old at this point. We got it used and hooked it to a 6 changer Onkyo cd player where it made a world of difference to the sound. Now, added to the Squeezebox there is seemingly little difference, the sound gets a little deeper perhaps but it is a very close call. Does this sound right to you folks, and if so, any suggestions as to a low cost DAC that would make a bigger difference. For example, would the Cambridge DAC Majic be a substantial upgrade to this.....Other elements are Vandersteen 1C's and NAD 326 integrated amp and NAD 545 cd player. Interconnect is a tributary digital coax.
Thanks, Audiowoman