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

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)