This could be any sub woofer idling in your store room.
If the frequency specs of the loudspeaker are rated far down the spectrum then its better, nevertheless filter becomes always a handy option for the same in much effective way.
Usually a sub woofer circuit is in the form of an active filter, but with the botheration of having a separate power supply for powering the circuit.
The proposed sub woofer crossover network is a passive type by nature which allows the audio signal itself to get filtered through the associated passive components arranged in a calculated configuration.
Owing to the fact that the low frequency bass signal may be equally present in both the channels of the stereo signals, any of the channels may be used as the input source for feeding the sub woofer filter through an appropriate amplifier stage.
The shown design is a 1st order low pass filter consisting of a variable input option via pot P1 and also an adjustable cut off frequency preset P2.
The network comprising R1, R2, P1 is selected to be compatible with a 50 watt amplifier while the crossover frequency could be set anywhere from 50 Hz to 160 Hz using the preset P2.
The components R3, P2, C1 are configured assuming that the sub woofer amplifier which may be hooked up with K1 is compatible with an input resistance of 47k.
The diagram shows a relatively lower value for C1 which may be appropriately increased as per individual preferences.
For optimal performance it would be better to first keep the sub woofer amplifier volume fully open and get the sound level adjusted with the aid of P1.
This will make sure that the sub woofer amplifier never gets over loaded and stays safeguarded even with the highest sound pressures.
If the above consideration becomes unfeasible to be implemented an external overload protector may be used for the same.
In case a reversal of phase becomes essential, it may be suitably executed by swapping the wires which connects the sub woofer speaker
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