Inputs
INPUT 1 through INPUT 4: XLR-3-31 type (transformer balanced)
MIC input
Input impedance: 2 k Ohm or more
Nominal input level: -70 dBu to -30 dBu
Phantom Power: P48V or T12V (selectable)
LINE input
Input impedance: 10 k Ohm or more
Nominal input level: -20 dBu to +4 dBu
AUX IN: XLR-5-51 type (electronically balanced)
Input impedance: 20 k Ohm or more
Nominal input level: +4 dBu
RTN IN: Connector: ø3.5mm stereo mini-phone jack (unbalanced)
Input impedance: 10 k Ohm or more
Nominal input level: -10 dBV

Outputs
MAIN OUT (L, R) / DIRECT OUT (CH1-2): XLR-3-32 type (transformer balanced)
Applicable load impedance: 600 Ohm or more
Nominal output level: +4, 0, -10 or -60 dBu (FM-4) / +4, 0, -20 or -60 dBu (FM-3) (switchable)
FM-4 SUB OUT / DIRECT OUT (CH 3-4): XLR-5-52 type (electronically balanced)
FM-3 SUB OUT: XLR-5-52 type (electronically balanced)
Applicable load impedance: 10 k Ohm or more
Nominal output level: +4, 0, -20 or -60 dBu (switchable)
TAPE OUT: Connector: ø 3.5mm stereo mini-phone jack (unbalanced)
Applicable load impedance: 10 k Ohm or more
Nominal output level: -10 dBV
AUX OUT: Connector: ø3.5mm stereo mini-phone jack (unbalanced)
Applicable load impedance: 10 k Ohm or more
Nominal output level: -10 dBV or -60 dBV (switchable)
PHONES: Connectors : 1/4” stereo phone jack and ø3.5mm stereo mini-phone jack
Applicable load impedance: 8 Ohm or more
LIMITER:
Attack time: approx 5 msec. Release time: approx 200 msec.
Threshold level: +6, +9 or +12dBu (FM-4) / +6 or +12dBu (FM-3) output level
Ratio: 3:1 or 5:1 (level and ratio can be selected using the status mode)
DC IN: XLR-4-32 type (male). Input voltage: DC10V to DC 24V
DC OUT: Hirose 4 pin (female). Applicable plug: Hirose HR10A-7P-4P. DC7.2V - 24

Performance
Frequency response:
LINE IN - MAIN OUT: 20Hz to 20kHz +/- 1dB (reference level)
MIC IN - MAIN OUT: 40Hz to 20kHz +/- 1dB (reference level)
HEADPHONES (32 Ohm load, 25mW output power): 20Hz to 20kHz +/- 3dB
S/N ratio (A-weighted):
LINE (INPUT GAIN: +4 dBu): 80dB or better
MIC (INPUT GAIN: -70dBu: 55dB or better (equivalent input noise: -125 dBu)
Total harmonic distortion:
LINE: 0.1% or less at 1 kHz (Input Gain +4dBu)
MIC: 0.1% or less at 1kHz (Input Gain -70dBu)
Headphones residual noise: (PHONES level control at minimum)
-72 dBV or less (A-weighted)
Crosstalk: -70 dB or less at 1kHz
HPF: 40Hz to 200Hz, -12dB/oct. The cutoff frequency is continuously sweepable.
EQ: HI: 10kHz fixed, +/-12dB MID: 200-8kHz variable, +/-12dB

Physical
External dimensions: 274 (W) x 57 (H) x 180 (D) mm (Including protrusions)
Weight: Approximately 1.5kg (not including the internal batteries)

Internal batteries: Eight AA batteries (alkaline: 12V, nickel hydride: 9.6V)
Power requirement: DC7.2 to 12V
External power supply: Optional AC adaptor (AD15C / AD15-4300)

Block Diagram