This was originally posted on Sept 17, 2008.

Samuel Groner shoot-out 27 popular audio IC op-amp performances. It comes with a complete paper of test setup and op-amp theory. A great resources for any audio DIYers and manufacturers who never do these tests on their own.

This is a serious reference documents for anyone who uses opamp in audio signal path.

http://www.sg-acoustics.ch/analogue_audio/ic_opamps/pdf/opam p_distortion.pdf