Clear-Com SB-704 Encore Switchboard Main Station

The SB-704 is a 2RU four-channel switchboard main station with programmable front panel buttons, individual channel short-circuit protection, individual channel volume control, a switchboard matrix, and a regulated fail-safe power supply. The SB-704 supports up to 55 beltpacks or 10 speaker stations, or 12 headset stations. The 10 x 4 assignment switching matrix allows up to 10 different groups of stations to be assigned to any one of the four channels.

Clear-Com SB-704 Features

• Supports up to 55 beltpacks or 10 speaker stations on 4 channels
• 10 x 4 assignment switching matrix
• Automatic short-circuit protection and reset with LED indicators
• Visual and audible call signaling
• 3 interruptible IFB channels
• Individual volume controls for each channel
• Channel linking
• Remote Mic Kill
• Stage Announce with relay
• External switchable line termination on each channel
• Universal voltage power supply

• SB-704 Encore Switchboard Main Station1

• Panel Microphone Input
  • Input Type: Electret
  • Input Impedance: >=2K
  • Mic Limiter Threshold: 0dBu ±3dB
  • Mic Limiter Range: >= 15dB
• Headset Microphone Input
  • Input Type: Dynamic
  • Input Impedance: >= 1K
  • Mic Limiter Threshold: 0dBu ±3dB
  • Mic Limiter Range: >= 15dB
• Program Line Input
  • Maximum Level before Clipping: >= 20dBu
  • Input Impedance: >= 5K
• Headset Output
  • Load Impedance: >= 8 Output
  • Impedance: <= 25
  • Output Limiter Threshold: +5dBu ± 3dB
  • Maximum Output Level before Distortion: >= 17dBu
• Speaker Output
  • Load Impedance: >= 4
  • Max Output Level before 1% Distortion: 20dBu ± 2dBu
• Partyline Output
  • Output Noise: < -74dBu
  • Output Impedance: >10K
• Partyline Input
  • Crosstalk: < -60dB
  • Max level before Clipping: >= 12dBu
  • Sidetone Null Capability: > 25dB
• Stage Announce/Balanced Line Out
  • Type: Balanced
  • Output Impedance: >= 200
  • Load Impedance: >= 600
• IFB/Hot Mic
  • Type: Unbalanced
  • Output Impedance: 150
  • Impedance: >= 600
• Frequency Response
  • Panel Mic – Partyline: 600 – 10kHz ± 3dB
  • Headset Mic – Partyline: 200 – 12kHz ± 3dB
  • Headset Mic – Line Out: 200 – 12kHz ± 3dB
  • Program Input – Partyline: 100 – 17kHz ± 3dB
  • Program Input – Headset Out: 200 – 10kHz ± 3dB
  • Program Input – Speaker Out: 300 – 10kHz ± 3dB
  • Partyline – Headset Out: 200 – 10kHz ± 3dB
  • Partyline – Speaker Out: 300 – 10kHz ± 3dB
• Max Distortion
  • Panel Mic – Partyline: <= 0.5%
  • Headset Mic – Partyline: <= 0.5%
  • Headset Mic – Line Out: <= 0.5%
  • Program Input – Partyline: <= 0.2%
  • Program Input – Headset Out: <= 0.2%
  • Program Input – Speaker Out: <= 0.5%
  • Partyline – Headset Out: <= 0.2%
  • Partyline – Speaker Out: <= 0.5%
• Noise
  • Panel Mic – Partyline: < -65dBu
  • Headset Mic – Partyline: < -70dBu
  • Headset Mic – Line Out: < -55dBu
  • Program Input – Partyline: < -85dBu
  • Program Input – Headset Out: < -60dBu
  • Program Input – Speaker Out: < -60dBu
  • Partyline – Headset Out: < -50dBu
  • Partyline – Speaker Out: < -50dBu
• Max Gain
  • Panel Mic – Partyline: >= 37dB
  • Headset Mic – Partyline: 41dB ± 2dB
  • Headset Mic – Hot Mic Out: 55dB ± 3dB
  • Headset Mic – Announce Out: 55dB ± 3dB
  • Program Input – Partyline: >= -16dB
  • Program Input – Headset Out: >= 18dB
  • Program Input – Speaker Out: >= 24dB
  • Partyline – Headset Out: >= 34dB
  • Partyline – Speaker Out: >= 40dB
• Min GainPanel Mic – Partyline: <= 25dB
• Mains Power
  • Input Voltage Range: 100 – 240V AC
  • Input Frequency Range: 50 – 60Hz
  • Input Power: <= 60
  • V AC Output Voltage: 30V DC ± 0.5V
  • Output Current per Channel (Continuous): 1.2A
  • Output Current per Channel (Peak): 2A (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
• Environmental32 – 122°F (0 – 50°C)
• Dimensions (HxWxD)3.5x15x10.5" (88x483x267mm)
• Weight10.9lbs (4.9kg)