Preamplifier FT-B2811P

This device features a 10-input channel mixer with independent volume control, treble, and bass adjustments, and a mute function. It includes a built-in bell/siren with priority, multiple output interfaces, and supports dual power supplies (AC/DC). The system offers dynamic level indication, signal grounding/floating options, and silent suppression for emergency inputs.
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Description
  • High-grade aluminum 2U black oxidized brushed panel, beautiful and elegant
  • 10-bit LED level dynamic indicator
  • Built-in bell/siren output with priority function
  • Ten input channels (5 microphones, 3 line channels, 2 emergency channels.
  • Each input channel has independent volume adjustment
  • With total volume adjustment, treble and bass are independently adjusted
  • With mute function, automatic mute to -30dB
  • With 4 AV output interfaces, 4 pure post-stage amplifiers can be connected
  • With 1-channel squelch mode switch, the squelch mode can be turned on or off as needed
  • With 1-channel signal grounding and floating ground switch, which can be selected according to on-site debugging
  • The audio output has 3 types (0.75V/1V/1.5V. of gain selection switches, and the factory default output is 0.75V
  • Adopt DC24V and AC100~240V dual power supply, automatically switch to DC24 DC power supply when there is no mains input
    • Parameter
    Microphone input (MIC) 600 ohms (Ω) 5mV, unbalanced
    Emergency input (EMC) 10k ohms (Ω) 200mV, unbalanced
    Line input (AUX) 10k ohms (Ω) 200mV, unbalanced
    Line output 10k ohms (Ω) 0.775V (0 dB), unbalanced
    Frequency response 60Hz~15kHz (±3dB)
    Non-linear distortion THD<0.01% at 1kHz
    Signal-to-noise ratio S/N >70 dB
    Tone adjustment range BASS:100Hz(±10dB), TREBLE:12kHz(±10dB)
    Power supply AC220V±10% 50-60Hz
    Power consumption 10~15W
    Machine size 89(H)×483(W)×350(D) mm
    Net weight 5.96kg
    Silent suppression capability When MIC1 is input, MIC2~ MIC5, EMC1~ EMC2, AUX1~AUX3 signal attenuation 0~30 dB, when EMC1~EMC2 input, MIC2~MIC5, AUX1~AUX3 signal attenuation 0~30 dB
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    FT-B2811P
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