Studio Technologies 742A ENG Audio Mixer

ITEM #: ST-742 MFG #: 742

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742 - Overview

The Studio Technologies Model 742 Audio Mixer is expressly designed for use in electronic-news-gathering (ENG) vehicles, small production trucks, and other specialized mobile broadcast applications. Many other audio production applications can also be supported. Model 742 features include four mic/line inputs, four line inputs, two output buses, LED level metering, and flexible monitoring. The Model 742 was specifically designed as a dual-channel audio mixer, rather than as a typical stereo device. This approach makes it excellent for use in "dual-path" on-air applications.

The Model 742 is targeted for use by operators with numerous audio sources that need to be quickly and reliably adjusted and routed to create one or two independent audio mixes. In these days of operators having too many tasks to handle, and too little time to do them, the Model 742 is a refreshing combination of performance and simplicity.

Mic/Line Inputs
Four input channels are provided for connection to microphone or line-level signals. The electronically balanced circuitry is "ruggedized" for reliable operation under tough operating conditions. The low-noise, low-distortion, high-headroom audio performance is what's expected of sophisticated "pro audio" equipment. Features provided for each input channel include an input sensitivity button, rotary level control, signal level status LED, and output bus assignment switch.

For ease of use, each input's rotary level control sets the gain of the input circuit as well as the level being sent to the selected main output bus (or buses). For convenience the input sensitivity button, as with the other Model 742A operator controls, is located on the front panel.

Line Inputs
Four input channels are provided for connection to line-level signals. Features provided for each line input channel include a rotary level control, level status LED, and output bus assignment switch. The rotary level control is used to set the amount of input signal that is sent to the selected main output bus (or buses). The dual-color level status LED provides signal present and peak level indication. A 3-position switch allows the input signal to be assigned to the desired output bus (or buses).

  • Features:

    • Four mic/line and four line-only inputs
    • Setup oscillator with dedicated output
    • Studio-quality compressors
    • Internal power supply
    • Flexible monitor section
    • 10-segment LED meters
    • All operator controls on front panel
    • Single rack-space mounting
     
  • 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 microphone 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 8 k ohms, line position 7 k ohms, nominal
    • 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 configured for POST level control; -10 dBu when configured 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 headphones with impedance of 100 ohms or greater
    • Maximum Voltage: 8 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 Source Impedance: 100 ohms, nominal

      Meters: 2
    • Function: displays level of output buses 1 and 2
    • Type: 10-segment LED, modified VU ballistics

      Connectors
    • Mic/Line and Line Inputs: 3-pin female XLR
    • Main Outputs: 3-pin male XLR
    • Reference Tone Direct Output, Monitor Outputs, Headphone Output: ¬-inch 3-conductor phone jack
    • AC Mains Input: 3-blade, IEC 320 C14-compatible (mates with IEC 320 C13)
    • DC Input: 4-pin male XLR
    • AC Mains Requirement: 100-240 volts (-15/+10%), 50/60 Hz, 15 W maximum
    • DC Input: 10-18 volts DC, 1.0 A maximum @ 12 volts; 1.1 A maximum @ 10 volts; current draw when AC present is <100 uA

      Environmental
    • Operating Temperature: 32 to 122 F
    • Storage Temperature: -40 to 158 F
    • Humidity: 5 to 95%, non-condensing
    • Altitude: not characterized

      Physical
    • Dimensions (Overall): 19.0 x 1.72 x 9.2 inches
    • Mounting: one space (1U) standard 19-inch rack
    • Weight: 4.3 pounds
     
  • Item Includes:

    • 1x Studio Technologies 742A ENG Audio Mixer with Four Mic/Line and Four Line-only Inputs
     

742 - Required Accessories

    California Residents:
    WARNING:
    Cancer and Reproductive Harm - www.P65Warnings.ca.gov