Specifications, General Audio | StudioTech M45-00151 specification

Specifications

General Audio:

Frequency Response: ±2.5 dB 100 Hz to 8 kHz

Distortion (THD+N): <0.2%, measured at 1 kHz, 4-wire input to 2-wire interface pin 2

Signal-to-Noise Ratio: >55 dB, measured at 1 kHz, 4-wire input to 2-wire interface pin 2

2-Wire Party-Line (PL) Intercom Interface:

Type: two-channel party-line, unbalanced

(pin 1 common; pin 2 DC with channel 1 audio; pin 3 channel 2 audio)

Compatibility: single- and dual-channel intercom systems such as from RTS® and Clear-Com®

Impedance – Normal: >10 k ohms

Impedance – 2-Wire (PL) Power Source Mode: 200 ohms

Nominal Level: –10 dBu

“Mic Kill” Signal: square wave, 24 kHz, ±1%

2-Wire Power Source: 30 volts DC nominal, 300 milliamperes maximum

Hybrids: 2

Topology: 3-section analog circuitry compensates for resistive, inductive, and capacitive 2-wire party- line loads

Nulling Method: automatic upon user initiation, processor implements digital control of analog circuitry; null settings stored in nonvolatile memory

Nulling Line Impedance Range: 120 to 350 ohms

Nulling Cable Length Range: 0 to 3500 feet, typical

Trans-Hybrid Loss: >40 dB, typical at 800 Hz

4-Wire Inputs: 2

Type: transformer-coupled, capacitor isolated

Impedance: 13 k ohms

Nominal Level: +4 dBu

Maximum Level: +22 dBu

4-Wire Outputs: 2

Type: transformer-coupled, capacitor isolated

Impedance: 50 ohms nominal

Nominal Level: +4 dBu

Maximum Level: +20 dBu into 2 k ohms

Meters: 4

Function: displays level of 4-wire inputs and outputs

Type: 5-segment LED, modified VU ballistics

Connectors:

4-Wire Line Inputs: 3-pin female XLR-type

4-Wire Line Outputs: 3-pin male XLR-type

2-Wire (PL) Interface: 3-pin male and female XLR-type

External 24 Volt DC Input: coaxial power jack,

2.1x 5.5 mm, locking bushing, compatible with Switchcraft® S760K plug

Power Requirements:

External: 24 volts DC nominal, acceptable range 20 to 28, maximum required current 750 milliam- peres @ 20 volts. Universal mains input/24 volt DC power supply shipped with each unit.

2-Wire Party-Line (when serving as source): 24 to 32 volts DC, 175 milliamperes

Dimensions – Portable “Throw-Down” Version (Overall):

8.7inches wide (22.1 cm)

1.72inches high (4.4 cm)

8.3inches deep (21.1 cm)

Mounting Options: single- or dual-unit rack-mount front panel; uses one space in a standard 19-inch rack

Weight: 1.8 pounds (0.82 kg), rack-mount front panel adds 0.2 pounds (0.09 kg)

Specifications and information contained in this User Guide subject to change without notice.

Model 45 User Guide	Issue Preliminary 2, March 2009
Studio Technologies, Inc.	Page 27