OK...I like the SC-1 as there seems to be a bit less self-noise in its operation.I own 2 of the SC-1's and bought them when I could have bought either set.My set of ADK's is not a matched set per se, but I dare anyone to find very much difference in their outputs,tonality, and sensitivity.I had the 603's in for only a short time but did track some with them.I would post these but I needed room on the harddisk for other things.
Really, for the price, you cannot go wrong with either mic.It becomes a personal selection at some point as the price break is a minimal difference.
Since I already had the AKG451B's I was simply looking to enlarge my mic locker and in doing so discovered a fine sounding piece of equipment in the ADK mic line.
I will say this, in sound comparison between the SC-1's and the 603's, to my ear, theres a sort of 'older' kind of tone to the ADK's that I did not hear with the 603's.....more like an older set of KM84's which I have used extensively in my time. Not nearly the detail(what does?!!) but the same sort of ordered tonality...
Thats all I know.....pick as you wish....you cant go wrong with either.One company you buy at banjo mart the other generally at a 'pro' shop.
I will for the sake of argument add one more mic to the hunt....at just a few dollars more, the Audix SCX-1 is a fine mic.Very very crisp in the highs and flat in the mids...as always YMMV