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Summary of Contents for Studio Technologies 742A
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Page 1: Audio Mixer
Audio Mixer User Guide Issue 1, July 2012 This User Guide is applicable for serial numbers: M742A-01151 and later © 2012 by Studio Technologies, Inc., all rights reserved www.studio-tech.com 50267-0712, Issue 1... - Page 2 This page intentionally left blank.
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Page 3: Table Of Contents
System Features ............6 Configuration Review ............ 9 Installation ..............10 Post-Installation Calibration .......... 17 Operation ..............18 Technical Notes ............. 24 Specifications ..............28 Block Diagram Model 742A User Guide Issue 1, July 2012 Studio Technologies, Inc. Page 3... - Page 4 Audio Mixer This page intentionally left blank. Issue 1, July 2012 Model 742A User Guide Page 4 Studio Technologies, Inc.
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Page 5: Introduction
Audio Mixer Introduction mixer the Model 742A can create two inde- pendent monaural signals, excellent for general signal monitoring, talent cueing, What This User Guide Covers or intercom support uses. This User Guide is designed to assist you The Model 742A is targeted for use by when installing, configuring, and using... -
Page 6: System Features
A carefully selected feature set ensures audio performance is what’s expected that the Model 742A will be a “team of sophisticated “pro audio” equipment. player” when it is integrated into an audio Features provided for each input channel system. -
Page 7: Line Inputs
(or buses), minimizing the compressor on/off switches are provided chance of unwanted “leakage.” Pan pots on the Model 742A’s front panel. Internal are fine in an audio mixer destined for use configuration jumpers determine the com- in stereo music situations, but are inferior pressor circuits’... - Page 8 +4 dBu. This can be used for Power various applications, including providing The Model 742A requires one space in a an additional set of main bus outputs. In standard 19-inch rack. Industry-standard certain cases this may eliminate the need XLR and ¼-inch 3-conductor connectors...
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Page 9: Configuration Review
A source of Compressor Modes 10 to 18 volts DC can also be connected to power the Model 742A. This allows the The compressor circuits associated with unit to operate from a variety of battery the two output buses can be configured... -
Page 10: Installation
The DC source can be used to power the come very annoying to a listener’s ears. In Model 742A or it can serve as a backup most cases 400 Hz will be perfectly accept- source for a connected AC mains source. -
Page 11: System Components
Also accessible on the back panel is one trim potentiometer that may need to be The shipping carton contains a Model adjusted prior to the Model 742A going 742A Audio Mixer, user guide, and AC into service. This trim pot sets the level of mains cord suitable for use in North Amer- the reference tone direct output. -
Page 12: Main Outputs
Main Outputs The Model 742A contains four line-level input channels. (Refer to Figure 4 for a The Model 742A contains two main out- detailed view.) Each input uses a 3-pin puts which are directly associated with female XLR connector. Prepare the mating output buses 1 and 2. -
Page 13: Monitor Outputs
1 and 3 together directly on the connector that will drop slightly. A 0.5 dB difference in mates with the Model 742A, not at the output level can be expected as the load other end of the cable. -
Page 14: Headphone Output
After an installation has been completed it means of a line-level output. As one of may be desirable to set the trim pot to pro- the unique features of the Model 742A, it vide the required level. For details please should definitely be utilized! This output... - Page 15 IEC 320 C13 connector on the other end. for main output bus 2 on the 3-conductor Units bound for other destinations require plug used to mate with the Model 742A’s that the appropriate cord set be obtained. back-panel jack. Don’t use a 2-conductor...
- Page 16 AC mains source Connecting DC Power will always power the Model 742A with The Model 742A can also operate from a the DC source serving as a “hot standby.” source of 10 to 18 volts DC. The current Only if the AC source fails will the unit required from a 12 volt DC source is 0.9...
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Page 17: Post-Installation Calibration
Model 742A. The Brother 2. Ensure that the Model 742A is con- label cassette number TX-3151, white on nected to a source of AC mains or DC black, is appropriate for use with some of power. -
Page 18: Operation
(typical of four) Operation Phantom Power In most broadcast news and general- While the Model 742A Audio Mixer is quite audio applications, phantom-powered simple to operate, there are nuances in condenser microphones are not utilized. its design that make a detailed discussion However, this is not always the situation worthwhile. - Page 19 Figure 14. Detail of front panel showing one line input channel (typical of four) as does the level of the signal sent to the selected output bus (or buses). Model 742A User Guide Issue 1, July 2012 Studio Technologies, Inc. Page 19...
- Page 20 Output Assignment Switch thresholds are set to be 6 dB over the A 3-position toggle-type switch is used to Model 742A’s nominal output level of assign which of the output buses the sig- +4 dBu. This correlates to a level on the nal will be routed to.
- Page 21 The important thing to remember is that how the meters will function during actual the steps show level in dBu, rather than Model 742A use. To a great degree meter VU units. So, for example, when the meter activity will depend on how the compres- step that is labeled “0”...
- Page 22 Audio Mixer • If the factory-default compressor thresh- 742A is operating and the tone is not as- old of +10 dBu is in effect, normal signed to the output buses.) The level of audio content will cause each meter to...
- Page 23 1 and the outer the Model 742A.) Using the headphone knob channel 2. Depending on how the output to monitor the Model 742A is a bit monitor output mode is configured, the different than monitoring a typical “stereo”...
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Page 24: Technical Notes
find the LEDs light- Now that we’ve reviewed all the sections ing on occasion, or even frequently, on that comprise the Model 742A, it’s time to signal peaks. But the LEDs should never actually use the unit. The following para- light continuously. - Page 25 1 kHz. Then apply power to the tor outputs so that they are after (“post”) Model 742A using a DC source in the the level controls. Moving the jumpers to range of 10 to 18 volts. (Do not connect the PRE –10 locations sets the monitor...
- Page 26 Model 742A Feature Set signals, the primary application for the unit. The attack and release times were The Model 742A was carefully designed also carefully selected for overall excel- with simplicity of operation in mind. Only lent performance. A typical user is not the required features and functions were in a position to, “on the fly,”...
- Page 27 The relays should prove to be very reliable, being designed for telecom use where typical operating life is in the millions of cycles. Model 742A User Guide Issue 1, July 2012 Studio Technologies, Inc. Page 27...
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Page 28: Specifications
Type: stereo, configured to drive headphones through 100 ohm series resistors Compatibility: intended for connection to head- phones with impedance of 100 ohms or greater Maximum Voltage: 8 Vpp, 100 ohm load Issue 1, July 2012 Model 742A User Guide Page 28 Studio Technologies, Inc. -
Page 29: Model 742A User Guide
Mounting: one space (1U) in a standard 19-inch rack Weight: 4.3 pounds (1.9 kg) Specifications and information contained in this User Guide subject to change without notice. Model 742A User Guide Issue 1, July 2012 Studio Technologies, Inc. Page 29...
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