The Model 740 Audio Mixer is expressly designed for use in compact electronic news-gathering (ENG) vehicles.Many other specialized audio production applications can also be supported. Features include six mic/line-level inputs, a monaural output bus, LED metering, and a flexible monitoring section. It’s important to note that the feature set was carefully selected to provide exactly what’s needed - and no more! Keeping it simple was the design mantra. The Model 740 is targeted for use by operators that have a multitude of tasks to perform, and too little time to do them. It provides all the features necessary for fast-paced news gathering operations, but is still easy to use.

A number of internal configuration jumpers allow the unit’s performance to be tailored to the needs of specific installations. The carefully selected feature set ensures that the Model 740 will be a "team player" when it’s integrated into an audio system. While there’s flexibility on the inside, the operator is presented with an easy-to-use set of front-panel controls and indicators - the operator never has to access the back panel to operate the unit. The Model 740’s audio quality is "pro" throughout. The components were carefully selected to deliver low-noise, low-distortion performance. Reliability over the long haul was a Model 740 design criteria. To that end the unit’s enclosure is made of steel, combining strength with effective RF rejection. On the inside, all components are mounted on an FR4 (fiberglass-based) circuit board assembly.

• Six mic/line inputs
• Setup oscillator with dedicated output
• Studio-quality compressor
• Internal power supply
• Flexible monitor section
• 10-segment LED meter
• All operator controls on front panel
• Single rack-space mounting

• Frequency Response: 20 Hz-20 kHz, ±0.5dB, mic/line in to main out
• Distortion (THD+N): 0.03%, measured at1k Hz, +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 formicrophone or live-level signals; 43 dB line input "pad" implemented using sealed bifurcated contact telecom relays
• Operating Level Range: mic inputposition: –78 to –8 dBu; line position: –35 to +35 dBu. Range specified togive +4 dBu on main output, master level control set to unity gain position.
• Type: electronically balanced
• Impedance: mic position 2 k ohms, lineposition 15 k ohms
• Common Mode Rejection Ratio: 70 dB @ 60Hz, 69 dB @ 40 kHz (typical), mic position, ref +4 dBu on main out
• 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
• Dimensions: 19"W x 1.72"H x 7.2"D
• Weight: 7 lbs