Czar of Midi
Since: Apr 04, 2002
Well, simple as it is the difference is the quality. The 600 series is the lower end of the Evolution series of mic's and the 900 is the higher end of the Evolution series.
The Evolutions series is actually their budget series of mic's. Not very budget priced whne you get to the 900 series.
And as well it really depends on which exact model you are looking at as well. Some of them the 600 series will do just fine.