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Studio Technologies 233 User Manual
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Studio Technologies 233 User Manual

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User Guide
Issue 5, November 2014
This User Guide is applicable for serial numbers:
M233-01151 and later
Copyright © 2014 by Studio Technologies, Inc., all rights reserved
www.studio-tech.com
50336-1114, Issue 5

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Summary of Contents for Studio Technologies 233

  • Page 1 User Guide Issue 5, November 2014 This User Guide is applicable for serial numbers: M233-01151 and later Copyright © 2014 by Studio Technologies, Inc., all rights reserved www.studio-tech.com 50336-1114, Issue 5...
  • Page 2 This page intentionally not left blank.

  • Page 3: Table Of Contents

    Installation and Setup ........... 12 Configuration ..............17 Operation ..............29 Advanced Operation ............. 34 Technical Notes ............. 35 Specifications ..............44 Appendix A ..............45 Block Diagram Model 233 User Guide Issue 5, November 2014 Studio Technologies, Inc. Page 3...
  • Page 4 This page intentionally not left blank. Issue 5, November 2014 Model 233 User Guide Page 4 Studio Technologies, Inc.

  • Page 5: Introduction

    field production personnel was integral to The Model 233 will also perform an out- its creation. Providing a veritable “tool kit” standing role in stadium announce appli- of features, the unit supports a wide variety cations.

  • Page 6: System Features

    Main Output level talkback outputs from multiple units to be directly “summed.” The Model 233 provides a main output that is designed to serve as the on-air, stadium For non-on-air applications, a special announcement, or other primary audio Model 233 feature set can be enabled by feed.
  • Page 7 Flexibility The signal from the compressor is always A large part of the Model 233’s unique used by the talkback functions. For flex- power is the ability to configure the op- ibility, the audio source for the main output...
  • Page 8 The systems from manufacturers such as hybrid mode is especially useful when the RTS™ and Clear-Com®. A broadcast-type Model 233 is used in a production-support IFB (interrupted foldback) circuit can also application. be connected to the intercom input. This “listen only”...
  • Page 9 In effect the Model 233’s sidetone A headphone control reverse mode is function adds the “minus” part to a “mix provided specifically for on-air television minus” cue. applications where a headset with boom microphone is used. The reverse mode Several configurable parameters allow...
  • Page 10 Intercom Interface Power Sources Of special note is the Model 233’s sophis- The Model 233 can derive its operating ticated intercom interface. It’s designed power from an intercom line or an external to work correctly with industry-standard 24 volt DC source. For redundancy, both...
  • Page 11 Model 233 to be optimized intercom interface. Two 8-position switch to meet the exact needs of specific applica- assemblies communicate the desired oper- tions.

  • Page 12: Installation And Setup

    Studio Technol- as AKG, Beyer, Neumann, Sennheiser, and ogies website. Shure will perform very well in Model 233 applications. The microphone input is also compatible with line-level audio sources. This allows the output of an external microphone pre- amplifier, microphone processor, or audio...
  • Page 13 3-pin female XLR connec- only premium-quality headsets, their tor which is located on the Model 233’s total cost of ownership would have been back panel. The mating connector (male) much less. Enough said…...
  • Page 14 1 on the main output’s connector is the headphone sources simply do not as- isolated from any point in the Model 233. sign any to the right channel headphone The fact that pin 1 “floats” will minimize output.
  • Page 15 The line-level talkback outputs are in- Line Inputs tended to drive the lengthy cable runs that The Model 233 allows two line-level audio are often part of broadcast and produc- sources to be connected. These sources tion audio applications. While the output can be individually routed to the left chan- circuitry is not intended to be “on-air”...
  • Page 16 24 volts, correct operation will take place nel 1 audio is on pin 2, and channel 2 audio over a 20 to 30 volt range. The Model 233 is on pin 3. With single-channel intercom requires 90 milliamperes at 24 volts DC lines common is on pin 1, DC power is on for correct operation.

  • Page 17: Configuration

    Configuration the clear caps on the top of the buttons. From the factory the left button is labeled For the Model 233 to support the needs COUGH, the center button is labeled of specific applications a number of op- TALKBACK 1, and the right button is erating parameters must be configured.
  • Page 18 So creating a nice “hot” signal will help maintain audio quality, specifically the signal-to-noise ratio, when driving the often-lengthy cable runs. Figure 3. Bottom view of Model 233 showing configuration switches, trim pots, and compressor active LED Microphone Preamplifier Gain...
  • Page 19 floor on the main and talkback out- preamplifier. The threshold is set to be puts will be much too high. 2 dB above the Model 233’s nominal in- Phantom Power On/Off ternal operating level. So a good “rule of The Model 233 can provide nominal 48 thumb”...
  • Page 20 In this case it may be desirable to assign This allows an announcer or other Model this intercom audio source to both the left 233 user to receive a confirmation signal and right channels. This would entail set- of what is coming out of the main, and if ting switches SW2-4 and SW2-9 to their on configured, talkback outputs.
  • Page 21 Special applications may benefit from The headphone output monaural mode using the Model 233 in a 3-channel head- feature was specifically included so that phone output mixer mode. This is accom- a 3-channel headphone mixer mode can plished by first configuring the headphone...
  • Page 22 (“pots”) can be used to create the desired can be changed even while the Model 233 “mix” of signals being sent to the head- is powered up and operating. The unit’s phone outputs. Many, many applications, operating characteristics will change in especially in production settings, can “real-time”...
  • Page 23 An exception is if the auxiliary relay is configured to follow the status of the talkback 1 button. In this case the talk- back 1 button will only control the relay. Model 233 User Guide Issue 5, November 2014 Studio Technologies, Inc. Page 23...
  • Page 24 Two modes are available: the Model 233’s system mode is selected • Disabled: In this mode the talkback 2 for production. In this case the main output button is disabled.
  • Page 25 Figure 15. Headphone control mode settings Figure 16. Headphone control operation settings Model 233 User Guide Issue 5, November 2014 Studio Technologies, Inc. Page 25...
  • Page 26 Model 233 inputs will always be present configured for alternate action or hybrid. on the headphone output. In most on-air...
  • Page 27 Model 233. Understanding how output. In this way, the main output and the three modes impact overall system...
  • Page 28 In summary, when selected for the correct application, each of the system modes can prove equally valuable. A thorough study of how they impact the Model 233’s operation can lead to many interesting and powerful uses. Talkback to Intercom Figure 22.

  • Page 29: Operation

    The user is now presented with Main Output Button Modes three buttons, four LEDs, and three rotary If the Model 233 is set for the on-air or controls. These are simple to operate and stadium announce mode: understand, as will be described in the following paragraphs.
  • Page 30 If the Model 233 is set to the produc- ity ends that state will resume; the main tion system mode the status of talkback 1 output will again be in its on (“latched”)
  • Page 31 This is intended to serve ment of the controls to be reversed. A third as an aid to Model 233 users. In an ideal parameter selects whether the headphone installation, setting the far left and center...
  • Page 32 As right channel. previously mentioned, a level trim potenti- ometer is associated with each line input. Issue 5, November 2014 Model 233 User Guide Page 32 Studio Technologies, Inc.
  • Page 33 Control Operation audio can also be provided from the inter- As previously discussed, the headphone com cue sources during Model 233 talk- output can be set for monaural operation. back to intercom activity. This “passive” This option is specifically provided so...

  • Page 34: Advanced Operation

    The two trim pots are accessible by way of round openings in the bottom of the Model 233’s enclosure. By adjusting these trim pots, signals with a nominal level of –12 dBV to +6 dBu can be effectively used as cue sources.

  • Page 35: Technical Notes

    Both are accessible on user or installer to be connected or dis- the bottom of the Model 233’s enclosure, connected as desired. However, repeated adjacent to the trim pots associated with field testing found that floating pin 1 on...
  • Page 36 2-channel party-line intercom circuit is prone to exhibit crosstalk. This occurs Intercom Audio Levels because the audio paths are unbalanced The Model 233 was designed to function (“single-ended”) and are typically trans- well with intercom lines associated with ported on a single shielded twisted-pair standard broadcast and production audio cable.
  • Page 37 In North American field and in-studio or rotary controls were not included in the broadcast applications it is common to find Model 233. But just in case a change is ever RTS 4000-series IFB equipment being used required intercom interface gain levels are to provide the IFB circuits.
  • Page 38 The green LED, Power located on the right, is lit whenever the A core part of the Model 233’s internal cir- main output is active. The thought pro- cuitry is a switch-mode power supply that cess behind the color choices was that...
  • Page 39 These headers, on 0.1-inch centers, are spare connector locations are specifically wired in parallel with the Model 233’s con- included so that a Model 233 can be cus- nectors. This “no solder” solution makes tomized to meet the many specific needs...
  • Page 40 3-pin female XLR pin assignment. ing to a connector slated to be installed in a spare location on the Model 233’s back P7: Main Output, pin 1 common, panel. For reference, the wire color for pin pin 2 high, pin 3 low.
  • Page 41 For special applications, provision has the cathode end located nearest the front been made to allow LED illumination of the Model 233. Power up the Model 233 (“backlighting”) of the three pushbutton and observe if the LEDs light. The LEDs switches.
  • Page 42 Model 233’s nominal internal op- pin 1 is connected to the common point erating level of –2 dBu. A 5:1 compression of the Model 233’s circuitry. Pin 2 is con- ratio is implemented and, like the threshold nected to the circuitry associated with the level, is not field adjustable.
  • Page 43 These relay contacts are ac- cessible on the Model 233’s main printed circuit board assembly by way of two 3-position header connectors labeled P16 and P17. The contacts are titled A and B, but there is no significance be-...

  • Page 44: Specifications

    Compatibility: single- and dual-channel intercom Specifications and information contained in this systems such as from RTS™ and Clear-Com® User Guide subject to change without notice. Impedance: 10 k ohms Issue 5, November 2014 Model 233 User Guide Page 44 Studio Technologies, Inc.
  • Page 45 Appendix A Attached to the bottom of the unit is a security plate with text that provides a summary of the configurable parameters and related information. Model 233 User Guide Issue 5, November 2014 Studio Technologies, Inc. Page 45...