Now that the DAC's have gotten so much better in the last few years it is much easier to hear the differences in the overall quality of trhe digital signal coming from various transports. Jitter is not the only thing that can cause poor sound from a transport. In my experience most older transports have poorly designed, poorly regulated and poorly filtered power supplies. These power supplies and their associated digital circuits put a far amount of eleictrical junk onto the digital output. However, and usually more importantly, many digital units put a tremendous amount of noise back on the AC lines where it can pollute other pieces of equipment. This is easily demonstrated with a noise sniffer or Oscilloscope. Your Studer, being a pro audio unit from a company known for its fanatical attention to engineering detail probably has a well designed power supply. That said, a jitter reducer like the Theta TLC which I use to isolate my digital satillite using the ATT glass output might make it sound even better. Carefully isolating the AC power supplies from one another also probably will improve your overall sound.
