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SB-704 (Last Time Buy)

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.

Note: Access the Encore Power Supply Calculator to estimate power requirements for analog partyline systems.

Details

  • 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

Item Code

SB-704

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 - 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

 
Environmental
32 - 122°F (0 - 50°C)
 
Dimensions

3.5 x 19 x 10.5in (HxWxD)

(88 x 483 x 267mm)

 
Weight
10.9lbs (4.9kg)

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