http://www.ap.com/
A dedicated audio analyzer from those guys is what one needs to measure this stuff properly - unfortunately it falls beyond the scope of most can use etc. Thats what we use at HQ to measure our stuff for the SNR figures in the marketing materials.
RMAA loopback testing is limited by the input SNR/dynamic range as well - so there will always be offset between the actual SNR/DR and what one can get with RMAA. The guides on RMAA are written so one can set the software up and at least get to the best possible measurement - hardware/software limitations of this form of testing withstanding.
-Raja




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