New in the box.

The box is soiled

Manu:  Pyramid

Model:  BM4

Universal bridging module for amplifiers

2, 3 or 4 channel mode

Gold plated connectors

Pyramid Gold Series Universal Bridging Module BM-4

See the photos of the manual for more technical information

    Gold Plated RCA Connectors
    Switchable 4,3,2 Channel mode
    Bridges ALL Amps Which has Complimentary Output Transistors
    Heavy Duty Metal Cabinet
    Independently Adjustable Level Controls
    Phase Distortion (1Khz): 0.01%
    Frequency Response: 10Hz-50KHz±3Db
    Noise Immunity Factor: Min 80dB