Studio Technologies 742A - Manual (Page 28)

Issue 1, July 2012 Model 742A User Guide
Page 28 Studio Technologies, Inc.
Audio Mixer
Specifications
General Audio Parameters:
Frequency Response: 20 Hz to 20 kHz, ±0.5 dB,
mic/line in to main outs
Distortion (THD+N): 0.03 %, measured at 1 kHz,
+4 dBu, mic/line in to main outs
S/N Ratio: 74 dB, referenced to +4 dBu, mic/line
in to main outs, 22 Hz to 22 kHz
Mic/Line Inputs: 4
Input Sensitivity: switch selectable for micro-
phone or line-level signals; 44 dB line input “pad”
implemented using sealed bifurcated contact
telecom relays
Phantom Power: 48 Vdc, nominal, meets IEC
61938 P48 standard
Operating Level Range: mic input position: –76
to –8 dBu; line position: –32 to +28 dBu. Range
specified to give +4 dBu on main outs, master
level controls set to unity gain.
Type: electronically balanced
Impedance: mic position 1.3 k ohms, line position
15 k ohms
Common Mode Rejection Ratio: 74 dB @ 60 Hz,
73 dB @ 40 kHz (typical), mic position, ref +4 dBu
on main outs
Status LED: dual-color, displays signal present
and peak
Line Inputs: 4
Operating Level Range: –14 to +28 dBu. Range
specified to give +4 dBu on main outs, master
level controls set to unity gain.
Type: electronically balanced
Impedance: 24 k ohms, nominal
Common Mode Rejection Ratio: 85 dB @ 60 Hz,
85 dB @ 40 kHz (typical), ref +4 dBu on main outs
Status LED: dual-color, displays signal present
and peak
Compressors: 2
Function: controls dynamic range of output buses
1 and 2
Type: single-knee, VCA-controlled
Slope: 5:1
Threshold: configurable, choices are: 6 dB over
nominal (+10 dBu on main output, factory default);
2 dB over nominal (+6 dBu on main out); disabled
Attack Time: 2 ms
Release Time: 100 ms
Status LEDs: 2, compressor active
Main Outputs: 2
Type: electronically balanced, capacitor-coupled,
intended to drive balanced or unbalanced loads of
600 ohms or greater
Source Impedance: 50 ohms, nominal
Nominal Level: +4 dBu
Maximum Level: +26 dBu into 10 k ohms,
+25 dBu into 600 ohms
Monitor Outputs: 2
Signal Sources: output buses 1 and 2
Type: electronically balanced, capacitor-coupled,
intended to drive balanced or unbalanced loads of
600 ohms or greater
Source Impedance: 50 ohms, nominal
Nominal Level: configurable, choice are: +6 dBu,
with monitor level control @ 100%, mode config-
ured for POST level control; –10 dBu when con-
figured for PRE –10; +4 dBu when configured for
PRE +4
Maximum Level: +26 dBu into 10 k ohms,
+25 dBu into 600 ohms
Headphone Output:
Signal Sources: output buses 1 and 2 (“post”
monitor level controls)
Type: stereo, configured to drive headphones
through 100 ohm series resistors
Compatibility: intended for connection to head-
phones with impedance of 100 ohms or greater
Maximum Voltage: 8 Vpp, 100 ohm load