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

4-Channel Switchboard Main Station with Built-In Power Supply 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: >=2KΩ Mic Limiter Threshold: 0dBu ±3dB Mic Limiter Range (SB-704): >= 15dB Headset Microphone Input Input Type: Dynamic Input Impedance: >= 1KΩ Mic Limiter Threshold: 0dBu ±3dB Mic Limiter Range (SB-704): >= 15dB Program Line Input Maximum Level before Clipping: >= 20dBu Input Impedance: >= 5KΩ Headset Output Load Impedance: >= 8Ω Output Impedance: <= 25Ω Output Limiter Threshold: +5dBu ± 3dB Maximum Output Level before Distortion: >= 17dBu Speaker Output Load Impedance: >= 4Ω Max Output Level before 1% Distortion: 20dBu ± 2dBu Party-line Output Off Noise: < -74dBu Output Impedance: >10KΩ Party-line Input Crosstalk: < -60dB Max level before Clipping: >= 12dBu Sidetone Null Capability: > 25dB Stage Announce/Balanced Line Out Type: Balanced Output Impedance: >= 200Ω Load Impedance: >= 600Ω IFB/Hot Mic Type: Unbalanced Output Impedance: 150Ω Load Impedance: >= 600Ω 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 Rear Panel Controls (1) Power switch (4) Intercom On/Off Switches Front Panel Connectors Panel Mic: (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)