Studio Technologies 740 - Manual (Page 24)

Issue 3, May 2004 Model 740 User Guide
Page 24 Studio Technologies, Inc.
Model 740
Specifications
General Audio Parameters:
Frequency Response: 20 Hz-20 kHz, ±0.5 dB,
mic/line in to main out
Distortion (THD+N): 0.03%, measured at 1 kHz,
+4 dBu, mic/line in to main out
S/N Ratio: 74 dB, referenced to +4 dBu, mic/line
in to main out, 22 Hz-22 kHz
Mic/Line Inputs: 6
Input Sensitivity: switch selectable for micro-
phone or live-level signals; 43 dB line input “pad”
implemented using sealed bifurcated contact
telecom relays
Operating Level Range: mic input position: –78
to –8 dBu; line position: –35 to +35 dBu. Range
specified to give +4 dBu on main output, master
level control set to unity gain position.
Type: electronically balanced
Impedance: mic position 2 k ohms, line position
15k ohms
Common Mode Rejection Ratio: 70 dB @ 60 Hz,
69 dB @ 40 kHz (typical), mic position, ref +4 dBu
on main out
Status LED: bicolor, displays signal present
and peak
Compressor:
Type: single-knee, VCA-controlled
Slope: 5:1
Threshold: configurable, choices are 1) 6 dB over
nominal (+10 dBu on main output, factory default),
2) 2 dB over nominal (+6 dBu on main out),
3) disabled
Attack Time: 2 mSec
Release Time: 100 mSec
Status LED: compressor active
Main Output:
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
External Monitor Inputs: 2, monaural
Type: electronically balanced, direct-coupled,
compatible with balanced or unbalanced signals
Impedance: 24 k ohms, nominal
Common Mode Rejection Ratio: 90 dB @ 60 Hz,
70 dB @ 86 kHz, typical
Nominal Level: +4 dBu
Monitor Output:
Type: electronically balanced, capacitor-coupled,
intended to drive balanced or unbalanced loads of
600 ohms or greater
Source Impedance: 50 ohms, nominal
Nominal Level: +6 dBu, with monitor level control
@ 100%, mode selected to be post level control
(no headphone mute)
Maximum Level: +26 dBu into 10 k ohms,
+25 dBu into 600 ohms
Signal Source: configurable, choices are 1) post
monitor level control with headphone muting
(factory default), 2) post monitor level control,
3) pre monitor level control
Headphone Outputs:
Source: same as selected for monitor output
Configuration: separate output driver circuitry
for front and back headphone output connections
Type: monaural source configured to drive stereo
headphones through of 100 ohm resistors
Compatibility: intended for connection to head-
phones with impedance of 100 ohms or greater
Maximum Voltage: 5.5 Vpp, 100 ohm load
Reference Tone:
Frequency and Wave Form: 400 Hz nominal,
sine wave (technician can revise to 1 kHz)
Direct Output Level: +4 dBu, nominal, adjustable
over –1/+3 dB range
Direct Output Type: electronically balanced,
capacitor-coupled, intended to drive balanced
or unbalanced loads of 600 ohms or greater
Direct Output Source Impedance: 100 ohms,
nominal