Subwoofer Filter also known as Low pass filter, is used for and found in many of today’s car audio systems, home theatre, or Multimedia sound system. allows the user to exclusively designate lower frequencies to a subwoofer. In the absence of a subwoofer, the low pass filter can do the same for rear, full range speakers.
Once the low pass filter is set by the user at a specific cutoff point, all frequencies lower than the cutoff will be passed along, while higher frequencies will be muted or filtered out. Used in conjunction with a high pass filter, one can “place frequencies” to the proper speakers, creating a total sound environment. Generally, low frequencies like bass guitar and bass drum are poorly reproduced through small-coned speakers.
While high-end smaller speakers might do a satisfactory job for some, for heart-pounding, chest-thumping bass, many audiophiles will want a speaker made for the job: a subwoofer. A subwoofer is designed to handle lower frequencies, delivering an astounding fullness and depth to any music that leans heavily on low-end frequencies. A low pass filter will enhance the lower end of the sound spectrum by keeping the bass channel cleaned of higher frequencies so that your subwoofer gets just the frequencies it was designed to reproduce.
By playing with the cutoff point, you can find that sweet spot that lets just enough midrange frequencies through to spread the sound envelope out. With front speakers handling higher frequencies, you can tweak to taste for optimum enjoyment.
in this article I will discuss simple Subwoofer Filter with IC Op-Amp TL 072. This circuit can be said quite simply, because it requires only one active component is an IC op-amp. active components in this circuit uses one IC Op-Amp TL 072. LM 072 can be replaced by another IC Op-Amp is the LM 062 and TL 082. prior to the subwoofer speaker box, the output of this circuit should be fed at the end of the amplifier (power amplifier) such as mono power amplifier OCL 150 Watt. This series is equipped with frequency control, power supply is uses symmetrical power supply 12 V, 0 V and minus 12 V. use a suitable power supply with smooth ripple and good regulator, this is to prevent unwanted noise.
schematic circuit can be seen below:
for PCB and component layout can be seen below:
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