Studio Technologies 742A Audio Mixer The 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. Key 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 Technical Specifications 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 Dimensions (Overall) 19.0 inches wide (48.3 cm) x 1.72 inches high (8.9 cm) x 9.2 inches deep (23.4 cm) Mounting One space (1U) in a standard 19-inch rack Weight 4.3 pounds (1.9 kg)
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