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)