Start Time Time required to accelerate to double the specified Wow and Flutter value.
15 ips: max. 0.5 s
7.5 ips: max. 0.4 s
3.75 ips: max. 0.3 s
Stop Time Time to stop from Play mode
15 ips: max. 0.5 s
7.5 ips: max. 0.3 s
3.75 ips: max. 0.3 s
Time to Stop from Fast Wind: max. 3 s
Fast Wind Time (for 2500-ft tape) max. 110 s (50 Hz) or max. 90 s (60 Hz)
Electronics (0 dBu = 0.775 V)
Line Input Mode: Transformerless Active Balanced
Input Impedance: 100 k, 20 Hz to 20 kHz
Nominal Level: +4 dBu
Max. Level: +30 dBu
Connectors: XLR Female type
Mic Input Mode: Transformerless Active Balanced
Input Impedance: 10 k
Min. Level: -70 dBu/-50 dBu/OFF switchable
Mic. Impedance: min. 150
Line Output Mode: Transformerless Active Balanced
Output Impedance: max. 5 (20 Hz to 20 kHz)
Load Impedance: min. 200
Nominal Level: +4 dBu/-16 dBu switchable
Max. Level: +26 dBu for 200
Connectors: XLR Male type
Headphone Output Load Impedance: 8W
Connector: 1/4" Standard Stereo Phone Jack
Equalization NAB/IEC Selectable
Standard Reference Flux MX-5050 BIII-2, MKIV-2, BIII-F: 185/250/320* nWb/m (*open circuit flux)
MX-5050 BIII-2E, MKIV-2E: 250/320/510* nWb/m (*open circuit flux)
Rec/Rep Frequency Response 15 ips: 30 Hz to 20 kHz ±2 dB
7.5 ips: 30 Hz to 18kHz ±2 dB
3.75 ips: 20 Hz to 10 kHz ±2 dB
Rec/Sel·Rep Frequency Response 15 ips: 250 Hz to 7.5 kHz ±3 dB
7.5 ips: 250 Hz to 5 kHz ±3 dB
3.75 ips: 250 Hz to 2.5 kHz ±3 dB
Signal to Noise Ratio
Measured with respect to a recording level of 1,040 nWb/m at 15 and 7.5 ips, and 740
nWb/m at 3.75 ips, using AMPEX 456 or equivalent tape.
Unwtd: Using a 30 Hz to 18 kHz RC filter to eliminate noise outside the audio spectrum.
Wtd: Using a NAB or ANSI “A” weighting filter and a 1 kHz reference.
MX-5050mkIV-2/BIII-2 Operation and Maintenance Manual
2 1999-02
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