PHONOGRAPH EQUALIZATION SETTINGS
The following TABLE provides suggested starting values for playback equalization of mono
recordings. Don’t be afraid to experiment as even this extensive table may be incorrect.
This information was taken from several sources: The Operating Manual for the Rek-O-Kut Re-
Equalizer, the Dial Your Discs chart which appeared in High Fidelity magazine in the early 1950s,
the chart provided by OWL Electronics, the chart compiled by James R. Powell, Jr. and published
in the ARSC Journal, and the jackets of early LPs. In addition, equalization data was found on the
web sites listed in the NOTES section.
When a recording is mastered (recorded) the amplitudes of the bass frequencies are reduced for
primarily mechanical reasons. When the recording is played, these low frequencies amplitudes must
be increased. The TURNOVER is the frequency below which the amplitude must be increased
during playback.
ROLLOFF is the amount of treble (high frequency) attenuation (cut) at 10 kHz required during
playback to compensate for the treble boost used during mastering. Some charts list Rolloff as a
frequency instead of an attenuation so a correspondence list is included at the end of this Table.
MATRIX is a “number” (may be a combination of numbers and letters) molded into the record just
outside the center label. This number is the “matrix” or mold identifier used to press the record. It
can be used to determine, at lease approximately, when the record was manufactured. In some cases,
the two sides of a record can have very different matrix numbers which means the two side may
need different equalization settings.
Remember, there was no equalization standard before 1955 so this table is a list of suggestions!
Increase the Turnover if the bass sounds too thin. Increase the Rolloff if the treble sounds too strong.
Manufacturer Speed Turnover Rolloff
Acoustic Records ALL 300 FLAT
Acoustic Records – alternate 78 FLAT FLAT
AFRS Transcriptions 33 RIAA FLAT
1944 some or if NAB specified RIAA -16
12 inch transcriptions 629 FLAT
Allegro 33 LP -16
Allied 33 RIAA -16
American Recording Society 33 RIAA -12
Angel 33 RIAA FLAT
Angel – alternate 33 RIAA -12
(26 Seiten)
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