For details on the measurement method look
here.
INDEX OF ALL CASSETTES
Maxell UR (1994) (what the deck was calibrated for)
Relative bias: (reference)
Relative sensitivity: (reference)
THD @ Dolby level: 0.42%
MOL400(THD=1%): +3.4dB
MOL400(THD=3%): +5.3dB
MOL1k(THD=3%): +2.9dB
SOL10k: -1.3dB
Bias noise: -49.5dB, -52.5dB(A)
Dynamic range: 57.8dB
Concerning sensitivity at 400Hz this UR seems a close match for the 1981 and 1994 IEC I references. At 10kHz UR sits between the old and the new reference.
Memorex MRX2 (1974)
Relative bias: -2.5
Relative sensitivity: 0dB
THD @ Dolby level: 1.0%
MOL400(1%): 0dB
MOL400(3%): +2.6dB
MOL1k(3%): +2.4dB
SOL10k: -2.5dB
Bias noise: -48.4dB, -51.6dB(A)
Dynamic range: 54.2dB
This is the one from the 'Is It Live ...' ads. In the 1973 October issue of Audio one M.B.Martin writes that for a high-quality reproduction of music four different tape classes can be considered: 1) Low Noise High Output, 2) chromium dioxide, 3) magnetite or cobalt-doped gamma ferric oxide, and 4) ... highly-developed gamma ferric oxide or MRX2.
Small detail: the author of that magazine article was a Memorex employee.
Memorex MRX3 (1978)
Relative bias: -1.5
Relative sensitivity: +0.2dB
THD @ Dolby level: 1.0.%
MOL400(1%): 0dB
MOL400(3%): +3.0dB
MOL1k(3%): +2.2dB
SOL10k: -1.5dB
Bias noise: -49.1dB, -52.3dB(A)
Dynamic range: 55.3dB
Memorex MRXI (1982)
Relative bias: -1
Relative sensitivity: +0.5dB
THD @ Dolby level: 0.52%
MOL400(1%): +2.2dB
MOL400(3%): +5.3dB
MOL1k(3%): +4.4dB
SOL10k: -1.4dB
Bias noise: -48.7dB, -51.9dB(A)
Dynamic range: 57.2dB
The tape surface was free of blemishes, and yet the measurements clearly show wear.
Memorex dBS (1987)
Relative bias: +5
Relative sensitivity: 0dB
THD @ Dolby level: 0.40%
MOL400(1%): +4.0dB
MOL400(3%): +6.5dB
MOL1k(3%): +3.0dB
SOL10k: +0.1dB
Bias noise: -46.6dB, -50.0dB(A)
Dynamic range: 56.5dB
Made by SKC.
Memorex Sound Invasion (1990)
Relative bias: -2.5
Relative sensitivity: -0.1dB
THD @ Dolby level: 0.95%
MOL400(1%): +0.1dB
MOL400(3%): +2.8dB
MOL1k(3%): +2.4dB
SOL10k: -0.8dB
Bias noise: -48.1dB, -51.2dB(A)
Dynamic range: 54.0dB
Memorex dBS I (1990)
Relative bias: 0
Relative sensitivity: -0.8dB
THD @ Dolby level: 0.65%
MOL400(1%): +1.3dB
MOL400(3%): +4.0dB
MOL1k(3%): +3.0dB
SOL10k: -2.4dB
Bias noise: -49.2dB, -52.6dB(A)
Dynamic range: 56.6dB
Made by Saehan.
Memorex dB (1991)
Relative bias: +0.5
Relative sensitivity: -0.6dB
THD @ Dolby level: 0.60%
MOL400(1%): +1.5dB
MOL400(3%): +4.4dB
MOL1k(3%): +3.7dB
SOL10k: -2.1dB
Bias noise: -49.7dB, -53.0dB(A)
Dynamic range: 57.4dB
Memorex dB (1994)
Relative bias: 0
Relative sensitivity: -0.4dB
THD @ Dolby level: 0.52%
MOL400(1%): +2.2dB
MOL400(3%): +5.1dB
MOL1k(3%): +3.0dB
SOL10k: -2.0dB
Bias noise: -49.1dB, -51.9dB(A)
Dynamic range: 57.0dB
Made by Forward.
Memorex DBx (1995)
Relative bias: -1
Relative sensitivity: 0dB
THD @ Dolby level: 0.55%
MOL400(1%): +1.9dB
MOL400(3%): +4.9dB
MOL1k(3%): +3.0dB
SOL10k: -1.7dB
Bias noise: -48.4dB, -51.5dB(A)
Dynamic range: 56.4dB
According to Hi-Fi Choice November 1995 the rights to the Memorex brand name fell into BASF's hands, at least for Europe. This DBx sports a BASF shell, AGFA-style hubs, but the tape is very slightly redder than 1991 or 1995 Ferro Extra I.
INDEX OF ALL CASSETTES
