Clear-Com, SB-704, 4-Channel 2RU Switchboard Main Station

Description

4-Channel 2RU Switchboard Main Station
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 Killv
Stage Announce with relay
External switchable line termination on each channel
Universal voltage power supply

Technical Specifications

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 Gain
Panel Mic – Partyline: <= 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

Environmental
32 – 122°F (0 – 50°C)

Dimensions
3.5 x 19 x 10.5 in (HxWxD)
(88 x 483 x 267 mm)

Weight
10.9 lbs (4.9 kg)