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IHF-A-Network  vs New IHF   S/N specs

Question asked by mgallant on Jul 31, 2013
Latest reply on Aug 1, 2013 by JeradL

Below are some S/N specs. from a ~ 1986  Yamaha AX-900U power amplifier. What is the difference in measurement setup for the "IHF-A " versus the "New IHF"?  I'm only interested in the "CD etc" results. It looks like the "signal level" is not mentioned for the CD results. Does that mean the signal level is for the "rated output" conditions? (130W rms / 8 ohms)?    These are  1986 specifications.  Have amplifier specifications/IHF recommendations changed since then to a "newer" IHF specification?