A Speaker Protection module is required to protect the speakers attached to an amplifier during the process of turn "ON" and "OFF" . During both of these processes the amplifer may exhibit a DC component in its Output.This Dc component is caused by the sudden application or interruption in supply voltages to the amplifier output stages and it may damage the voice coils inside the loudspeakers . Apart from the POwer on and off processes, an amplifer can again exhibit a very strong DC component in its output in the unlikely event of an amplifier power stage failure, where DC component would be instantaneously strong enough to permanently damage the speaker voice coil. So in order to protect the Speakers in all these cases a circuit is required to protect the speakers . These circuits are placed in between the amplifier's output and the speakers , that is the amplifier's output is routed to the speakers through these circuits . The main function of such circuits are

• To introduce a Delay in connecting the speakers to the amplifier's output during the power up process. 
• To constantly monitor the amplifiers output for any DC component and temporarily disconnect the speakers from the amplifier in such an event.
• To instantly disconnect the speakers from the amplifier's output as soon as the power down process is initiated

All the above requirements are fullfilled by a single dedicated Chip upc1237, that has been designed to perform all the 3 functions. 
Theaudiocrafts bring to you some of the best quality of speaker protection modules based on this chip. One should understand that an amplifier's output stage exhibits a very high current signal .In order to route this high current signal to the speaker the speaker protection circuits should have 2 extremely good quality Components .

• The first being the PCB itself , that should have a good copper foil thickness to handle the large current .
• Secondly Good Quality relays , that have been designed to handle High inrush currents.

All the modules in this section Have the very best components for the price. Please check the Specifications of each module, which differ from each other in terms of supply voltage and the Max current handling for the relays. Please take a special note that none of the modules listed below can be used for BTL amplifiers until and unless the specifications say so