I started a thread back when I bought my first Denon DA-500. Since then, Deepak has picked one up, and I've picked up a second one, and others have been looking for one. So it's generating a little more interest. Now talk has turned towards possible improvements.
- PCM-1702 based
- buffered op-amp output stage?
- 3 optical inputs
- 2 coaxial inputs
- 1 optical output
- 1 coaxial output
- 1 analong output
From my previous threads:
A lot of the sound is probably due to the PCM1702. The 1702, along with the 63 and 1704, are tremendously nice sounding converters IMO. However, you can improve the performance of your DA-500 by changing the op-amps. It seems to have M5218 and NJM4570 op-amps; change the i/v converter to THS4032, and use maybe a single-to-dual adaptor with a couple of AD825s for the buffer. Add in some bypassing/decoupling if there isn't any. Try maybe 0.1uF across the rails and 100uF to ground, although there may be more optimal configurations. I think you'll enjoy the results
Here's the analog section of the DA-500. Some highlights are:
M5218 op amps (IC502 and IC504) are filters
PC4570 op amps (IC501 and IC503) serve as I/V and buffer
C514 and C515 are the output capacitors
A good modding thread from the diyAudio Forums:
diyAudio Forums - A little Denon DAC mod
Some additional internal shots I took today...
It seems that as a PCM-1702 based DAC, it's a reasonable platform to start, especially when considering the more-than-reasonable cost of one of these units. So, for those in the know, what are some of the best places to improve? And if anyone needs P/N that can't be made out in the pics, I'm sure I can open mine back up again.