Speaker Protection Circuit, used for Audio Power Amplifiers, protect the loudspeaker in case of Amplifier Power stage failure, DC voltage on Loudspeaker terminal, short-circuit, or other kind of faults. It also delay the Loudspeaker connection with few seconds after power is applied, to prevent the click or pop noise when the amplifier is powered-up. The board is made using high quality components, Omron relay, thick PCB and tracks, screw connectors.