Studio Technologies 742A Audio Mixer with Four Mic/Line and Four Line-only Inputs

ITEM #: ST-742A MFG #: 742A

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$1,250.00

Availability: Usually Ships in 5-14 Days.
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742A - Overview

The Studio Technologies Model 742A Audio Mixer is expressly designed for use in electronic-news-gathering (ENG) vehicles and small production truck applications. Many other fixed and mobile audio production, on-air, and utility applications can also be supported. Model 742A features include four mic/line inputs with +48 volt phantom power, four line inputs, two output buses, LED level metering, flexible monitoring, and AC and DC powering. The Model 742A was specifically designed as a dual-channel audio mixer, rather than as a typical stereo device. This approach makes it excellent for "dual-path" on-air applications. As a utility mixer the Model 742A can create two independent monaural signals, excellent for general signal monitoring, talent cueing, or intercom support uses.

The Model 742A 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 742A is a refreshing combination of performance and simplicity. Using their experience in mobile broadcast applications, the engineers at Studio Technologies were able to design the Model 742A to include all the crucial features required to meet the needs of fast-paced news-gathering operations, while still providing the operator with an easy-to-use product.

  • 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
    • AC mains and DC powering
    • +48 volt phantom power
    • All operator controls on front panel
    • Single rack-space mounting
     
  • Specifications:

    • 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 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 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: 1
    • 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 Type: Electronically balanced, capacitor-coupled, intended to drive balanced or unbalanced loads of 600 ohms or greater
    • 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: 1/4-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 less than 100 uA

      Physical
    • Dimensions (Overall): 19.0 inches wide x 1.72 inches high x 9.2 inches deep
    • Mounting: One space (1U) in a standard 19-inch rack
    • Weight: 4.3 pounds
     
  • Item Includes:

    • 1x Studio Technologies 742A Audio Mixer
     

742A - Required Accessories

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