Originally posted by: CoolWind
To the OP: I was wondering the same thing. Found this:
http://www.soundblaster.com/products/Audigy4pro/compare.asp
Not a huge amount of difference among them. Main thing is s/n ratio on 2ZS vs 4, and external IO on 2ZS Plat Pro and 4. ZS Platinum is same as ZS except with a 5.25" front panel section for IO and a remote.
If you're WAY into audio recording, then Audigy4 is what you want. You can save some $ and still get great surround processing and output quality with a 2ZS (non-platinum). Personally, I want to keep everything in the case and won't be doing any recording, so I'm looking towards the 2ZS non-plat (or maybe the platinum if my case door will close over the front panel knobs). It would be nice if there were an Audigy 4 basic with the better s/n but without the external box...