Why does my Mono block or single channel amplifier have 4 speaker terminals ?

Some Mono block (single channel) amplifiers have 4 speaker output  terminals as shown below. These are internally linked Positive together and Negative together, this is to make connection to multi coil Subwoofers easier when you configure in parallel. You can connect each coil directly to the terminals (one per side) rather than at the subwoofer.

 

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