Clear-Com SB704

The 704 series is Clear-Com's most advanced party-line intercom system. Each station is a four-channel intercom with superior audio and versatile channel access to provide unmatched communication flexibility. All front-panel controls are intuitive and easy to operate. The station's front-panel buttons are programmable and can be customized for a wide variety of applications that will meet the demands of any stage, studio, or field producer. Separate volume controls for every channel ensure the perfect audio mix in the headset or on the integral speaker. The regulated power supply in the MS-704 provides power for the entire intercom system.

SB-704 Main Station
This station is similar to the MS-704 main station except the speaker is replaced by a 10 x 4 assignment matrix panel. The assignment matrix panel allows you to choose any intercom station or group of stations connected to the ten inputs of the matrix and assign them to any one of the four intercom channels.

Superior “Contoured” Audio
Compatible with all Clear-Com party-line intercoms, the 704 series accepts a wide range of dynamic headsets, with a choice of headset connectors. Optional plug-in noise-cancelling gooseneck microphones are available in 9” and 18” lengths.

Redundant “Failsafe” Power Supply
The 1.2-amp universal switching power supply is a 30-volt regulated supply with multiple short-circuit protection. It can sense the difference between a long-term short circuit and an instantaneous overload, allowing the intercom to continue to operate even when a station is plugged in, momentarily exceeding the capacity of the power supply. If a shutdown occurs from a shorted intercom cable, the power supply will recover under full load when the short is removed.

“Easy Access” Sub Panel
A removable front panel gives the operator easy access to the station’s configuration switches and trim pots. Clearly labeled and simple to adjust, these controls allow the station to be instantly configured for virtually any communications application. When configuration is complete, the front panel re-attaches, revealing only those controls useful for normal operation.

Multiple Program Audio Sources
The station accepts five separate program audio sources: four line-level balanced inputs and one assignable line level input. The assignable program input accepts a balanced signal and is designed for monitoring external audio in the headset or speaker. The four balanced program inputs can be used to create individual program feeds on the intercom channels. Three of these channels can be used for program interrupt.

Features

• Four Independent Intercom Channels for ultimate flexibility
• Microprocessor-Controlled Logic assures maximum communications power
• Universal Voltage Power Supply for 100 - 240 VAC operation, with shortcircuit protection on each channel
• Linking Control instantly links channels together in “super party line”
• Separate Talk and Listen Buttons for each channel
• Individual Listen Volume Controls for each channel
• “All-Talk” Function permits instant communications to all four channels
• Four Separate Program Inputs are electronically balanced
• Three Interruptible IFB Channels make talent cueing easy
• “Announce” Button with Relay for external paging
• Visual “Call Signaling” alerts users when others want to speak to them
• Wide-Range High-Output Speaker for optimum clarity in all acoustic environments
• “Hot-Mic” Output allows easy connection to external IFBs
• Adjustable Mic Proximity Compensation reduces acoustic feedback
• Superior “Contoured” Audio insures excellent voice intelligibility under all noise conditions, including high-noise environments
• LED buttons for talk, call, announce, link, all talk, and mic on
• Remote Mic Kill switch turns off the microphone talk circuits

Specifications

• Panel Microphone Input
  Input Type: Electret
  Input Impedance: >=2K ohms
  Mic Limiter Threshold: 0dBu ±3dB
  Mic Limiter Range MS-704: >= 15dB
• Headset Microphone Input
  Input Type: Dynamic
  Input Impedance: >= 1K ohm
  Mic Limiter Threshold: 0dBu ±3dB
  Mic Limiter Range: >= 15dB
• Program Line Input
  Maximum Level before
  Clipping: >= 20dBu
  Input Impedance: >= 5K ohms
• Headset Output
  Load Impedance: >= 8 ohms
  Output Impedance: <= 25 ohms
  Output Limiter Threshold: +5dBu ± 3dB
  Maximum Output Level before Distortion: >= 17dBu
• Speaker Output
  Load Impedance: >= 4 ohms
  Max Output Level before 1% Distortion: 20dBu ± 2dBu
• Party Line Output
  Off Noise: < -74dBu
  Output Impedance: >10K ohms
• Party Line Input
  Crosstalk: < -60dB
  Max level before Clipping: >= 12dBu
  Sidetone Null Capability: > 25dB
• Stage Announce/Balanced Line Out
  Type: Balanced
  Output Impedance: >= 200 ohms
  Load Impedance: >= 600 ohms
• IFB/Hot Mic
  Type: Unbalanced
  Output Impedance: 150 ohms
  Load Impedance: >= 600 ohms
• Frequency Response
  Panel Mic - Party Line: 600 - 10KHz ± 3dB
  Headset Mic - Party Line: 200 - 12KHz ± 3dB
  Headset Mic - Line Out: 200 - 12KHz ± 3dB
  Program Input - Party Line: 100 - 17KHz ± 3dB
  Program Input - Headset Out: 200 - 10KHz ± 3dB
  Program Input - Speaker Out: 300 - 10KHz ± 3dB
  Party Line - Headset Out: 200 - 10KHz ± 3dB
  Party Line - Speaker Out: 300 - 10KHz ± 3dB
• Max Distortion
  Panel Mic - Party Line: <= 0.5%
  Headset Mic - Party Line: <= 0.5%
  Headset Mic - Line Out: <= 0.5%
  Program Input - Party Line: <= 0.2%
  Program Input - Headset Out: <= 0.2%
  Program Input - Speaker Out: <= 0.5%
  Party Line - Headset Out: <= 0.2%
  Party Line - Speaker Out: <= 0.5%
• Noise
  Panel Mic - Party Line: < -65dBu
  Headset Mic - Party Line: < -70dBu
  Headset Mic - Line Out: < -55dBu
  Program Input - Party Line: < -85dBu
  Program Input - Headset Out: < -60dBu
  Program Input - Speaker Out: < -60dBu
  Party Line - Headset Out: < -50dBu
  Party Line - Speaker Out: < -50dBu
• Max Gain
  Panel Mic - Party Line: >= 37dB
  Headset Mic - Party Line: 41dB ± 2dB
  Headset Mic - Hot Mic Out: 55dB ± 3dB
  Headset Mic - Announce Out: 55dB ± 3dB
  Program Input - Party Line: >= -16dB
  Program Input - Headset Out: >= 18dB
  Program Input - Speaker Out: >= 24dB
  Party Line - Headset Out: >= 34dB
  Party Line - Speaker Out: >= 40dB
• Min Gain
  Panel Mic - Party Line: <= 25dB
• Mains Power
  Input Voltage Range: 100 - 240 VAC
  Input Frequency Range: 50 - 60 Hz
  Input Power: <= 60 VAC
  Output Voltage: 30 VDC ± 0.5V
  Output Current per Channel (Continuous): 1.2 A
  Output Current per Channel (Peak): 2 A (Do not exceed the 1.2A rating for more than 2 seconds per 1 minute period)
  Short Circuit Recovery Time (1st short): <= 0.5 sec
  Short Circuit Recovery Time >= 20 shorts in 20sec): <= 20 sec
• Station Capacity: Up to 40 RS-601 beltpacks or 10 speaker stations or 12 headset stations distributed over all channels
• Rear Panel Connectors
  Switched Intercom: (10) XLR-3M (1 per channel)
  Intercom: (4) XLR-3M (1 per channel)
  Announce Out: (1) XLR-3M (audio)
  Program In: (1) XLR-3F
  Hot Mic / IFB Interface: (1) 1/4 in. (0.64 cm) phone jack
  External Speaker: (1) 1/4 in. (0.64 cm) phone jack
  Accessory: (1) DB-15F
  AC Power: IEC 320 connector
• Front Panel Connectors
  Panel Mic: (1) 1/4 in. (0.64 cm) panel mounting jack
  Headset: (1) XLR-4M
• Front Panel Controls & Indicators
  (1) Panel / headset mic switch
  (1) Mic on button
  (1) All talk button
  (1) Announce button
  (1) Party line link button
  (4) Program ON-OFF-INTERRUPT DIP switches
  (1) Program level control
  (4) Listen adjust controls
  (4) Channel null adjust controls
  (4) Channel program feed adjust controls
  (4) Talk buttons
  (4) Call buttons
  (4) Listen buttons
  (1) RMK button
  (1) Speaker ON-OFF switch
  (1) Speaker volume control
  (4) Short LEDs
  (1) Panel mic gain control
  (1) Sidetone adjust control
  (1) Headset audio limiter DIP switch
  (3) Interrupt enable DIP switches
  (4) Auto-call DIP switches
  (4) Auto-talk/listen DIP switches
  (4) Talk latch disable DIP switches
  (4) Line length DIP switches
  (10) Channel Assignment Slide switches
• Environmental: 32 - 122°F
• Dimensions (W x H x D): 19" x 3.5" x 10.5"
• Weight: 10.93 lbs

TMGR# SB704