Hi all, Like my post title suggests, newbie to thinking about DAC's, but pretty experienced in analog audio. Here's the deal: I have a Denon DCD-1520 CD player, circa 1988. Love it and use it frequently. But I've been wondering if the DAC portion could be improved. I have my eye on a Fostex HP-A8C Headphone Amp/DAC, which the internet tells me has the AKM 4399 DAC. (I'm particularly interested in this Fostex vs. other DAC's because it will provide me with a good headphone amp at the same time.) If not mistaken, I can output optical cable from the CD player into the Fostex, thereby making the Denon a transport, and the Fostex the DAC. My question to the forum is: would the DAC on the fostex provide noticeable improvement on the native DAC in the Denon CD player? Apparently the Denon uses NE5532 OP-AMP on the outputs, and PCM64P (two of them) for the DAC. Informed opinions are appreciated!