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)
