This BELL 2.1 Active Crossover For Subwoofer is an audio frequency filter, which is divided into two parts, namely fullrange frequency and low frequency (sub-woofer). This module is also equipped with a volume control and low frequency ranging from 20Hz to 100hz.
This BELL 2.1 Active Crossover For Subwoofer is equipped with a symmetrical power supply, the transformer voltage source ranging from 15 to 18 volts CT. To stabilize the voltage, the module used diode bridge and regulator IC type 7815 and 7915.
Because it is a pre-amp then you have to connect the subwoofer filter with mono power amplifier, while the output of the R + L which is associated with the frequency fullrange stereo power amplifier.
You can see the stereo and mono power amplifier from the list provided in AudioRakitan.com.
All components used in this module using resistor 1% metal films and capacitor types MSM.
From the test results sound incredible! vocal sound is so clear and can be well represented. Extraordinary subwoofer so low, and the kicking.