I agree with Malcolm on this. I'm amazed that the outcome of modifications/tweaks are assessed in such a subjective and unscientific manner. I don't think MRC plots are the answer either, as they are just too variable to provide any meaningfull comparative data. Blind listening tests(with n= >10) are the only way determine if what your ears are receiving has changed in reality.

Cliff

Main system - Sources (Kodi-HTPC, Vero 4k, FireTV, Sat) into Trinnov Altitude 32 (8-16) (+Roon), Trinnov Amplitude 8 amp & Vivid Audio (Giya G3, V1.5) and REL Stentor III speakers. Others: F80 + Raspberry Pi and other Pi systems.