Otari Mx-55 N-M

Tape Transport

Track Configuration

1/4" (6.3 mm) Width Tape, 2-track 2-channel, NAB or DIN Stereo

Nom. Tape Speed

38.1 & 19.05 cm/s (15 & 7.5 ips) switchableChangeable to 19.05 & 9.5 cm/s (7.5 & 3.75 ips)

Speed Accuracy

Within ±0.2%

Speed Deviation

Less than 0.2%

Pitch Control

±20% continuously variable control.Percentage or ips readout with 0.01% precision multiturn encoder servo system.

Fast Wind Time

60 Hz = 100 s, 50 Hz = 110 s (2,500 ft tape)

Reel Size

NAB 10.5", 7", 5", EIA (cine), DIN ReelTape Max. Length = 3,280 ft (tape thickness 50 μm)

Motor

Capstan = DC Brushless Motor, Quartz PLL Controlled Direct DriveReel = AC Induction Motor

Head

Plug in head block with full access to independent head height, tilt and azimuth adjustment

Start Time(Time to reach within twice specified wow & flutter.)

38.1 cm/s = Less than 0.5 s19.05 cm/s = Less than 0.3 s9.5 cm/s = Less than 0.2 s

Wow & Flutter(PEAK WTD, DIN45507, IEC Pub.386)

38.1 cm/s = Less than ±0.06%19.05 cm/s = Less than ±0.08%9.5 cm/s = Less than ±0.12%

Tape Timer

Seven segment LED readout from tachometer/logic measurement circuit; indicates tape time in Hours, Minutes and Seconds.

External Speed Control Range

-50%, +100% at all speeds (4.8 to 19.2 kHz)

VEM Tape Speed

+100% with VEM optional accessory and continuous lower speed change accompanying tone change

Electronics (Measured with AMPEX #456 tape. 0 dBu

0.775 V)=

Line Input

3-pin XL Type Connector (female)
Transformerless Active Balanced
Input Impedance: 10 kΩ
Ref. Input Level: +4 dBu (0 to +10 dBu), -16 dBu (-10 to -20 dBu)
Max. Input Level: +30 dBu

Mic Input

3-pin XL Type Connector (female) Transformerless Active Balanced
Input Impedance: 10 kΩ (20 Hz to 20 kHz)
Min. Input Level: -70 dBu
Microphone Impedance: 150 to 10 kΩ
With Supply Channel (CH1/BOTH/CH2) Selection Switch

Line Output

3-pin XL Type Connector (female) Transformerless Active Balanced (bal/unbal. switchable)
Output Impedance: 5Ω
Ref. Output Level: +4 dBu (0 to +13 dBu), -16 dBu (-7 to -20 dBu)
Load Impedance: min. 200Ω
Max. Output Level: +26 dBu (bal. load), +21 dBu (unbal. load)

Bias and Erase Frequency

150 kHz

Magnetic Flux Level

MX-55N = 185/250/370 nWb/m (switchable)
MX-55D = 250/320/510 nWb/m (switchable)

Frequency Response(Rec/Rep. 0 dB = 250 nWb/m)

38.1 cm/s = 30 Hz to 20 kHz ±2 dB (0 dB)
19.05 cm/s = 20 Hz to 18 kHz ±2 dB (-10 dB)
9.5 cm/s = 20 Hz to 10 kHz ±2dB (-20 dB)

Frequency Response(Sel-Rep)

38.1 cm/s = 30 Hz to 12 kHz ±3 dB
19.05 cm/s = 20 Hz to 5 kHz ±3 dB
9.5 cm/s = 20 Hz to 2.5 kHz ±3 dB

Distortion (38.1 cm/s, 1 kHz, 250 nWb/m)

Less than 0.3%

Crosstalk

MX-55N = min. 55 dB
MX-55D = min. 50 dB

Depth of Erasure(38.1 cm/s, 1 kHz, 1040 nWb/m)

MX-55N = min. 75 dB
MX-55D = min. 70 dB

Rec/Rep Signal-to-Noise Ratio(30 Hz to 18 kHz BPF, UNWTD)

MX-55N NAB 38.1 cm/s, 1040 nWb/m = 69 dB
MX-55N NAB 19.05 cm/s, 1040 nWb/m = 71 dB
MX-55N NAB 9.5 cm/s, 740 nWb/m = 64 dB
MX-55N IEC 38.1 cm/s, 1040 nWb/m = 71 dB
MX-55N IEC 19.05 cm/s, 1040 nWb/m = 68 dB
MX-55N IEC 9.5 cm/s, 740 nWb/m = 64 dB
MX-55D IEC 38.1 cm/s, 1040 nWb/m = 72 dB
MX-55D IEC 19.05 cm/s, 1040 nWb/m = 69 dB
MX-55D IEC 9.5 cm/s, 740 nWb/m = 65 dB

Test Signal Oscillator Frequency

100 Hz, 1 kHz, 10 kHz Sine Wave, switchable

Miscellaneous

Power Requirement

100/110/117/200/220/240 VAC, ±10%, single phase 50/60 Hz

Power Consumption

150 VA

Operating Environment

Temperature: 5 to 45°C, Relative Humidity: 20 to 80%

Storage Environment

Temperature: -20 to 45°C, Relative Humidity: 10 to 80%

Weight

30 kg

Dimensions (W x D x H)

440 x 222 x 488 mm

Standard Accessories

NAB Reel Adapter
10.5" Empty Reel (MX-55N only)
DIN 12" Empty Reel (MX-55D only)
Power Cord
Fuse 1 A x 2
Fuse 2 A x 4
Fuse 5 A x 1
Fuse 5 A (slow blow) x 1
Lubrication Oil (PZ9E003)
Case Foot Operaiton Manual

Optional Accessories

CB-127-S Remote Controller
ZA-81G-S Stand (with Reel Spacer. Tilt Adjustable)
ZA-81B-T Stand (without Reel Spacer)
ZA-81D-S Reel Spacer (for ZA-81B-T)
ZA-5CG Rack Mount Bracket
SB-12S Scissors
ZA-5CU Fader Control Kit
PB-1AXAS VEM (Voice Edit Mode)
PCBZA-5CW Proximity Switch Kit
ZA-5CX Multi Purpose Phone Jack Kit
ZA-5CL Input Transformer
ZA-5CM Output Transformer


Revision #3
Created 2026-04-01 17:14:55 CEST by Philip
Updated 2026-04-13 19:22:56 CEST by Philip