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Summary of Contents for Studio Technologies 740
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Page 1: User Guide
Model 740 Model 740 Audio Mixer User Guide Issue 3, May 2004 This User Guide is applicable for serial numbers: M740-00151 and later © 2004 by Studio Technologies, Inc., all rights reserved www.studio-tech.com 50026-0504, Issue 3... - Page 2 This page intentionally left blank.
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Page 3: Table Of Contents
System Features ............6 Configuration Review ............ 8 Installation ..............9 Post-Installation Calibration .......... 14 Operation ..............15 Technical Notes ............. 21 Specifications ..............24 Block Diagram Model 740 User Guide Issue 3, May 2004 Studio Technologies, Inc. Page 3... - Page 4 Model 740 This page intentionally left blank. Issue 3, May 2004 Model 740 User Guide Page 4 Studio Technologies, Inc.
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Page 5: Introduction
Model 740 Model 740 Introduction applications, Studio Technologies was able to design the Model 740 to include What This User Guide Covers all the crucial features required to meet the needs of fast-paced news-gathering This User Guide is designed to assist you... -
Page 6: System Features
Model 740 Reliability over the long haul was a Model control the dynamic range of the main au- 740 design criteria. To that end the unit’s dio bus. An LED indicator lights whenever enclosure is made of steel, combining the compressor circuit is actively control- strength with effective RF rejection. - Page 7 3-position switch. In this way Unique to the Model 740 is the ability to the level of the main audio bus, as well configure the monitor output to meet the as the two external monitor sources, can needs of the “real world.”...
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Page 8: Configuration Review
+10 dBu. This is an excellent the source to be monitored on the Mod- general purpose setting that is appropri- el 740’s front panel. But only the level ate for most applications. control on the amplified speaker is used... -
Page 9: Installation
In this case the Model 740’s front-panel control will only impact the headphone Installation output level. In this section, the Model 740 will be Meter Source installed in an equipment rack. Input and The meter source can be configured output connections will be made using to operate from one of two modes: the Model 740’s multitude of jacks. - Page 10 (males) so that pin 2 Model 740 going into service. This trim pot is signal high (+ or hot), pin 3 is low (– or sets the level of the reference tone direct cold), and pin 1 is shield.
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Page 11: External Monitor Inputs
1 and 3 together directly on the connector that mates with the Model 740, not at the other end of the cable. External Monitor Inputs Two external audio signals can be con-... - Page 12 As one of source in this manner results in hum or the unique features of the Model 740, it noise, connect pin 2 to high (+ or hot) and should definitely be utilized! This output pin 3 to shield;...
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Page 13: Headphone Outputs
A connector plugged into the back-panel headphone jack will never impact the monitor output. Note that while the Model 740 is a single- channel (monaural) device, the head- Detail of back panel showing AC mains power phone outputs are configured to drive connector stereo headphones. -
Page 14: Post-Installation Calibration
Studio Technologies’ technical sup- it approaches 600 ohms. port personnel for details. The Model 740 uses a 3-pin IEC 320 C14-compatible inlet connector to mate with a detachable mains cord set. For units shipped to North America and... -
Page 15: Operation
Ensure that prints white text on a black background this meter connection does not remove works out perfectly for the Model 740. The the normal load! The level meter must Brother label cassette number TX-3151, be a precision device that’s intended white on black, is appropriate for use with for audio use—a general-purpose volt-... -
Page 16: Master Output
Model 740’s internal operating level. When the tone is connected to the main Master Output audio bus, the master level control can be The Model 740’s master output section... -
Page 17: Level Meter
For maximum audio fidelity during typical or either of the external monitor inputs, Model 740 use, the LED should not light can be displayed. or should light infrequently. While the meter is easy to interpret, it’s somewhat different from one that... -
Page 18: Monitor Section
Model 740 and its associated equip- how the meter will function during actual ment. The monitor section supports both Model 740 use. To a great degree meter loudspeaker and headphone devices. activity will depend on how the compres- The monitor output is line level and is sor has been configured to operate. - Page 19 The rotary control is always used to adjust were used during the design of the Model the output level of the front- and back- 740; their high sensitivity made them go panel headphone outputs. Depending “way loud”! (While a bit “bright” in the...
- Page 20 So with a channel’s mic/line switch Now that we’ve reviewed all the sections and level control set correctly only the that comprise the Model 740, it’s time to green color should light. Signal peaks actually use the unit. The following para- may cause an occasional red “flash,”...
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Page 21: Technical Notes
The cover front panel, it is located behind the moni- of the Model 740 must be removed tor source select switch. to access the configuration jumpers. Monitor Output Configuration This exposes the technician to a The monitor section’s line-level output... - Page 22 Here’s the trim pot and tests points are located a review of some of the features that on the Model 740’s printed circuit board weren’t included and the reason why: assembly. • Including microphone phantom power To change the frequency to 1 kHz simply would have been nice.
- Page 23 43 dB off” operation will take place. balanced attenuator (“pad”) is connected • The Model 740 has a monaural audio between each input connector and its as- mixing bus. Certainly not a sexy choice, sociated microphone preamplifier circuit.
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Page 24: Specifications
Source Impedance: 50 ohms, nominal Direct Output Source Impedance: 100 ohms, Nominal Level: +4 dBu nominal Maximum Level: +26 dBu into 10 k ohms, +25 dBu into 600 ohms Issue 3, May 2004 Model 740 User Guide Page 24 Studio Technologies, Inc. -
Page 25: Model 740 User Guide
7.2 inches deep (18.3 cm) Mounting: one standard rack space Weight: 7.0 pounds (3.2 kg) Specifications and information contained in this User Guide subject to change without notice. Model 740 User Guide Issue 3, May 2004 Studio Technologies, Inc. Page 25... -
Page 26: Model 740 User Guide
Model 740 This page intentionally left blank. Issue 3, May 2004 Model 740 User Guide Page 26 Studio Technologies, Inc.
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