Do you face problems in tuning the subwoofer? A small mistake in setting can ruin the entire system. That is why you cannot play the sounds that are pleasant. Moreover, they do not produce tones at reasonable listening volumes over the entirety.

How to Tune the Subwoofer

Subwoofers are perfect for a variety of purposes from raging parties to casual drives. You can use it either for orchestral music, rock and roll, or for low-frequency effects explosions in blockbuster movies. They are a well-balanced speaker and provide less bass distortion.

Set the Gain to Clear away Deformity

Sometimes distortion occurs due to excessive clipping which leads to poor sound quality and damage of speakers. That is why tuning processes to set the input sensitivity or gain on the amplifiers, is important to get the optimum performance from the amplifier without extreme clip.

First of all, disconnect the speaker wires from the amplifier’s outputs. Make sure that any processing from the source unit and amp is turned off to confirm that bass and treble on the head unit are set to zero. Then completely turn down the feed-in responsiveness on the amplifier. If the amplifying device has either a low level or high-level sensitivity then set it to the low position.

Set its volume to three-quarters of full volume to allow the reasonable gain overlap with a moderate excerpting at full volume. Use the recommended voltage chart to determine the proper output voltage for the loudspeaker based on its application. After that, play the one-kilohertz sine wave at 3-4th capacity. Then place the digital voltmeter to read AC voltage and connect it to the announcer outputs on the amplifier.

Then boost the left front positive and the right front negative as well as on the rear, the west side positive, and rear right negative outputs. For a traditional four-channel, beat the positive and negative gain from each avenue individually. Then slowly increase the input sensitivity of the amplifier until reaching the approved voltage. Now the loudspeaker has been set to its maximum unclipped output levels. Again reconnect the speaker to listen to the system with music at a moderate level.

This is to listen and check if one amplifier is overpowering the other, such as the door speakers being louder than the subwoofer. If one of the amplifiers is playing too loudly, turn down the input sensitivity of that amplifier until both amplifiers are blending nicely together. This defeats the purpose of too much clipping into the system. Finally, the gain on the amplifiers is properly set to reduce the potential for excess clipping to minimize the falsification for improving reliability.

Set the Subsonic Filter to Remove low Frequency

It is needed to block the lowest audible frequencies. However, always set the subsonic filter normally around half note below the tuning. So, any beat below the frequency you pick creates noise. If it is set to 31 hertz. That is why frequencies lower than that will be drastically reduced coming out of the amp because the setting is not designed to play that low number. It allows a clean signal.

Adjust the Bass Boost

A lot of amateurs use it to make their bass louder. However, do not use it across a broad spectrum because it causes some malformation. That is why it damages your subwoofers. So, use it carefully. If you set the frequency 60 hertz and then you turn your bass boost up to 60 halfway it creates a peak right at around 60 Hz. So anytime when you play music at 60hz bass beat is going to be super extenuated loud, and it is unproportional. At higher volume, it sends unclean waves, which causes a much quicker clip. This is entertainment for everybody because it makes the sound blaring.

Adjust the Frequencies

The LPF (low pass filter) allows the speakers to play the frequencies that you want to play and not run the ones that you do not want on the amplifier. It is adjustable from 30 hertz up to 250 Hz. If the LPF is set at 80 hertz then the subwoofer does not tune anything above that. The setup of the low pass filter depends on the size of the speakers. For example, if LPF is set at 100 then the subwoofers play 100 hertz and below. As you covered the frequency spectrum, you can hear every note of the music that is designed to hear.

An HPF (high pass filter) allows frequencies higher than a certain point to pass. This provides better speaker protection and more efficient usage of your amplifiers. The combination of a high pass and a low pass filter allows frequencies within a certain bandwidth to pass through subsonic filters. If they are mid-bass speakers, then they are not going to reproduce the low frequencies of the subwoofers. So turn on the high pass.

Adjust the Phase Change

The phase is all about polarity if the subwoofers are inverted or regular. It changes the direction in which the speakers are moving. When you alter the phase, you are changing the polarity which changes the direction of the motion of the speaker. If the polarities are hooked up correctly then you can listen to the music without any disturbance.

You can make changes if they are out of phase. For example, if you have one set of speakers going and another one going down, delay half a second in moving above and below. Then start adjusting the phase properly and the proper way to do that is with an oscilloscope to match the sine wave together. This allows your speakers to work together, and not against each other. After all these levels you hear a loud and harmonious sound.

During this tuning process, common mistakes can usually occur. The misstep that can occur is the setting of the subsonic filter too low and the low pass filter too high on your sub and this usually occurs when the installer is trying to squeeze every last drop of output out of the system. But this is reckless and should be avoided as it can likely result in damaged equipment.


Oftentimes when you bring the subwoofers people start to frown and talk about how bad they sound. And absolutely they can sound bad, but when set up correctly, a subwoofer is nothing but a benefit to your system. You can hear your favorite music at high as well as at low volume.

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