Clear-Com SB-440 4 Channel Switchboard

The 440 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 SB-440 includes a versatile switching matrix which allows up to ten different groups of stations to be assigned to any one of the four channels. A convenient “link” feature ties all four channels into one giant party line for rehearsal or staff check. The stations have adjustable mounting ears that can be removed for desktop operation. The regulated power supply in the MS-440 and SB-440 provides power for the entire intercom system. These stations have front-panel short-circuit indicators to show if a short has occured on any of the four intercom lines. Other features include separate audio sources for all intercom channels and three built-in IFB program interrupts for talent cuing.

Features

• Four Independent Intercom Channels- for ultimate flexibility
• Microprocessor-Controlled Logic- assures maximum communications power
• Universal Voltage Power Supply- for 90 - 240 VAC operation, with short-circuit 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

Specifications

• CONTROL SYSTEM: CMOS Digital logic and signal switching
• OVERALL STATION AUDIO:
  • Bandwidth: 150 Hz -15 kHz
  • Signal to Noise: >75 dB
  • Channel Separation: > 50 dB
  • Line Impedance: Terminating (200 Ω)
• MIC PREAMP:
  • Input Level: -55 dBv nominal, -10 dBv max (0 dBv is referenced to 0.775 volts rms)
  • Impedance: 200 Ω nominal
  • Frequency Response: 150 Hz -15 kHz (contoured for max. intelligibility)
  • Limiter Range: 25 dB
  • Gain Adjust: 5 dB
• HEADPHONE AMPLIFIER:
  • Load Impedance: 50 - 2,000 Ω
  • Output Level: > +20 dBv across 600 Ω
  • Distortion: <0.2% THD at 1 kHz
  • Frequency Response: 150 Hz - 18 kHz ±2 dB
• SPEAKER AMPLIFIER (SB-440):
  • Load Impedance: 8-50 Ω
  • Output Level: 4 watts into 8 Ω
  • Distortion: <0.5% THD at 1 kHz
• PROGRAM INPUTS:
  • Type: Line level electronically balanced
  • Nominal Imput Level: -10 dBv
• STUDIO ANNOUNCE:
  • Type: Transformer balanced output
  • Level: 0 dB
  • Relay: SPDT
  • Contact Rating: 24 Volts DC @ 1 amp
• ELECTRET MICROPHONE (Optional):
  • Connection: Proprietary plug-in locking connector
  • Pattern: Cardioid
  • Length: 9" or 18" gooseneck
  • Frequency Response: 100 Hz - 20 kHz
• TALK REMOTE CONTROL: Two logic inputs
• POWER SUPPLY
  • Type: Switching, with reset circuitry for each channel
  • Output Voltage: 30 VDC regulated
  • Output Current: 2.0 A max.; 1.75 A max. on any channel; with electronic current limiter, circuit breaker protected
  • Hum and Noise: <-80 dBv
• SYSTEM CAPACITY
  • 60 beltpacks or 20 speaker stations
  • AC POWER REQUIREMENTS
  • 90 - 240 VAC, 50 - 60 Hz
• DIMENSIONS: 3.5" H x 17" W x 6.75" D (89 x 432 x 171 mm) (19" W with included rack ears) Depth does not include rear panel connectors.
• WEIGHT: 9.7 lbs. (4.4kg)
• CONNECTORS
  • Headset: 4-pin male XLR
  • Intercom Lines: Fourteen 3-pin male XLR
  • Program Input: 3-pin female XLR
  • Announce Output: 3-pin male XLR
  • External IFB: 1/4" phono jack
  • Aux: 15-pin DB connector
  • External Speaker: 1/4" phono jack