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Appendix A - Equalisation Curves
List of EQ curves available with the PH-77
Stereophonic Microgroove LP Records
Monophonic Microgroove LP Records
Display Name
Comments
Display Name
Comments
RIAA
Modern stereo LP playback curve
Mono RCA 50
RCA, Urania, Lyrichord
eRIAA
Modern stereo LP playback curve
Mono
FFRR 49
Decca & London
1949-1951
but rectifies the high frequency roll-off
Mono FFRR 51
Decca & London
1951
and excessive phase shift of the vinyl
Mono FFRR 52
Decca & London
1952
cutting lathes (Enhanced RIAA EQ)
Mono FFRR 53
Decca & London
post 1953
Columbia
Columbia LP stereo
Mono AES 51
1951 AES Standard
DECCA (FFSS)
Decca & London
stereo and NAB
Mono Columbia 48
Early Columbia LP mono
stereo LP’s US
Mono Columbia 52
Late Columbia LP mono
CCIR 56
Europe pre appx. 1962, Eastern
Mono EMI
Early EMI LP
Europe & Asia pre appx. 1975
Mono CCIR 53
Europe pre appx. 1956
Mono CCIR 56
Europe pre appx. 1962, Eastern
Monophonic Microgroove LP Records
Europe & Asia pre appx. 1975
Display Name
Comments
Mono Bartok
Bartok LP’s
Mono RIAA
also RCA Orthophonic, adopted pro-
Mono NAB
1942 also NARTB
gressively after 1954
Mono 78 RCA 38
RCA electrical 78RPM post appx. 1938
Mono eRIAA
Same as RIAA, but rectifies the high
Mono 78 Columbia 38
Columbia electrical 78 RPM post appx.
frequency roll-off and excessive phase
1938
shift of the vinyl cutting lathes (Enhanced
RIAA EQ)
