Clear-Com SB-704 4-Channel Switchboard Main Station

4-Channel Switchboard Main Station - 5-channel X 10 station assignment matrix, no speaker - with built-in 2-amp power supply, rack mount (2RU)

SB-704 includes all of the features of the MS-704, with a 4 x10 assignment matrix in place of the internal speaker (external speaker required for station monitoring). The station features a ten-position slide switch matrix that allows assignment of any of the ten intercom lines to any of the four intercom channels, to an isolated separate party-line, or to an off position.

Specifications:

• Panel Microphone Input: Input Type: Electret, Input Impedance: >=2K?, Mic Limiter Threshold: 0dBu ±3dB, Mic Limiter Range (SB-704): >= 15dB
• Headset Microphone Input: Input Type: Dynamic, Input Impedance: >= 1K?, Mic Limiter Threshold: 0dBu ±3dB, Mic Limiter Range (SB-704): >= 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
• PartySpeaker Output: Load Impedance: >= 4?, Max Output Level before 1% Distortion: 20dBu ± 2dBu
• Party-line Output: Off Noise: < -74dBu, Output Impedance: >10K?
• Party-line 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?, Load Impedance: >= 600?
• Frequency Response: Panel Mic - Party-line: 600 - 10KHz ± 3dB, Headset Mic - Party-line: 200 - 12KHz ± 3dB, Headset Mic - Line Out: 200 - 12KHz ± 3dB, Program Input - Party-line: 100 - 17KHz ± 3dB, Program Input - Headset Out: 200 - 10KHz ± 3dB, Program Input - Speaker Out: 300 - 10KHz ± 3dB, Party-line - Headset Out: 200 - 10KHz ± 3dB, Party-line - Speaker Out: 300 - 10KHz ± 3dB
• Max Distortion: Panel Mic - Party-line: <= 0.5%, Headset Mic - Party-line: <= 0.5%, Headset Mic - Line Out: <= 0.5%, Program Input - Party-line: <= 0.2%, Program Input - Headset Out: <= 0.2%, Program Input - Speaker Out: <= 0.5%, Party-line - Headset Out: <= 0.2%, Party-line - Speaker Out: <= 0.5%
• Noise: Panel Mic - Party-line: < -65dBu, Headset Mic - Party-line: < -70dBu, Headset Mic - Line Out: < -55dBu, Program Input - Party-line: < -85dBu, Program Input - Headset Out: < -60dBu, Program Input - Speaker Out: < -60dBu, Party-line - Headset Out: < -50dBu, Party-line - Speaker Out: < -50dBu
• Max Gain: Panel Mic - Party-line: >= 37dB, Headset Mic - Party-line: 41dB ± 2dB, Headset Mic - Hot Mic Out: 55dB ± 3dB, Headset Mic - Announce Out: 55dB ± 3dB, Program Input - Party-line: >= -16dB, Program Input - Headset Out: >= 18dB, Program Input - Speaker Out: >= 24dB, Party-line - Headset Out: >= 34dB, Party-line - Speaker Out: >= 40dB
• Min Gain: Panel Mic - Party-line: <= 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
• Station Capacity: Up to 40 RS-601 beltpacks or 10 speaker stations or 12 headset stations distributed over all channels
• Rear Panel Connectors: Switched Intercom: (10) XLR-3M (1 per channel), Intercom: (4) XLR-3M (1 per channel), Announce Out (1) XLR-3M (audio), Program In: (1) XLR-3F, Hot Mic / IFB Interface: (1) 1/4 in. (0.64 cm) phone jack, External Speaker: (1) 1/4 in. (0.64 cm) phone jack, Accessory: (1) DB-15F, AC Power: IEC 320 connector
• Front Panel Connectors: PanelMic: (1) 1/4 in. (0.64 cm) panel mounting jack, Headset: (1) XLR-4M
• Front Panel Controls & Indicators: (1) Panel / headset mic switch, (1) Mic on button, (1) All talk button, (1) Announce button, (1) Party-line link button, (4) Program ON-OFF-INTERRUPT DIP switches, (1) Program level control, (4) Listen adjust controls, (4) Channel null adjust controls, (4) Channel program feed adjust controls, (4) Talk buttons, (4) Call buttons, (4) Listen buttons, (1) RMK button, (1) Speaker ON-OFF switch, (1) Speaker volume control, (4) Short LEDs, (1) Panel mic gain control, (1) Sidetone adjust control, (1) Headset audio limiter DIP switch, (3) Interrupt enable DIP switches, (4) Auto-call DIP switches, (4) Auto-talk/listen DIP switches, (4) Talk latch disable DIP switches, (4) Line length DIP switches, (10) Channel Assignment Slide switches
• Environmental: 32 - 122 ?F (0 - 50 ?C)
• Dimensions: 19 in. W x 3.5 in. H x 10.5 in. D(483 mm x 88 mm x 267 mm)
• Weight: 10.93 lbs. (4.97 kg)