What is the best sounding DAC at $2000-$4000?

The download is just a linear PDF. Check if you have Acrobat reader installed on your Mac.

Basically if the buffer is too small, it can run out of data so you will hear distortions. The bigger the buffer, the more data is cached so processor/DAC never runs out.

denon a100 cd/sacd player. It has a USB port. 32 bit conversion

09-12-12: Devilboy
How do you increase the buffer size?

It should be adjustable in the Preferences or Options sub-menu of the program you are using to play the files.

Regards,
-- Al

Almarg: Thanks again but I couldn't find anything. I'm using PurMusic for playback. I went through PureMusic's menus in "preferences" and couldn't find anything about buffer size. I'm not that knowledgeable about computers and software. I don't want to be a pain here, but can someone describe it step-by-step?

Can't go wrong with the PWD II. It sounds great and has received excellent reviews, one can get significant discounts or buy used here on Audiogon.
Streaming with the Bridge is simple and sounds better than most USB solutions. Paul McGowan is one of the good guys in the industry seeking to provide great sounding equipment at reasonable prices. PS Audio is to be commended.