Clear-Com SB-704, 4 Ch. switchboard main station

Clear-Com SB-704, 4 Ch. switchboard main station

Clear-Com SB-704 is designed for monitoring external audio, the assignable program inputs can be used to create individual program feeds on intercom channels. Clear-Com SB-704 features an access switches and trim pots from a removable front panel to allow quick configuration of the system. SB-704 has a remote mic kill turns off the microphone talk circuits of all Clear-Com beltpacks eliminating noise from the open headset microphones. Another thing in SB-704 has a power supply protection in the event of short circuit and current overload, the protection circuit with shut down the output to avoid damage and will automatically restore the system power as soon as the fault condition is removed.

4 Ch. switchboard main station: 
Encore four-channel switchboard main station. 5 positions X 10 outputs assignment matrix, no speaker. Built-in 1-amp (2-amp peak) power supply, 2RU rack mount. One XLR-3 Male connectors for each partyline A-D; one XLR-3 Male per Partyline output 1-10; one XLR-3 female for Program Audio in and one XLR- 3 Male for Stage Announce out on the rear panel. Jacks for hot mic out and external loudspeaker.

Clear-Com SB-704 Product Features

• 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 Kill
• Stage Announce with relay
• External switchable line termination on each channel
• Universal voltage power supply
• Actively Monitor Intercom
• Easy Panel Configuration
• Eliminate Noise
• Power Supply Protection

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)