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Reply to [log in to unmask] Hello everyone; Attached is a frequency response plot of both the old acoustic machines and the newer Orthophonic acoustic talking machines. I don't know the source or validity of this plot but it does seem reasonable to me. Anyone know anything about this plot? Ron Roscoe [log in to unmask] -----Original Message----- From: Association for Recorded Sound Discussion List [mailto:[log in to unmask]] On Behalf Of Steve Smolian Sent: Monday, June 25, 2018 9:38 PM To: [log in to unmask] Subject: [ARSCLIST] Acoustic frequency range Has anyone measured the frequency range of acoustic records? I seem to recall George Brock-Nannastadt published this info somewhere but can't locate it. Also, has anyone his email address? He's not in the ARSC directory. Steve Smolian