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Model 45 User Guide Issue Preliminary 2, March 2009
Studio Technologies, Inc. Page 27
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,
2.1 x 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):
8.7 inches wide (22.1 cm)
1.72 inches high (4.4 cm)
8.3 inches 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.