Here are the frequency curves
White 2520 - Green SC25
http://www.pbase.com/sbushman/image/358 ... iginal.jpg
White 2520 - Green 1272
http://www.pbase.com/sbushman/image/358 ... iginal.jpg
White 1272 1 - Green 1272 2
http://www.pbase.com/sbushman/image/358 ... iginal.jpg
Shane
UPDATE -
Still loving the A12s and N72s. After completely matching a signal chain (mic cables, mics, output line cables, and source) I am happy to report I hear no appreciable difference between the SC25 and 2520 opamps. In fact, they phase cancel each other almost completely.
I was using 2 different cable types before and the cables affected the sound more than the difference in op amps.