How To Tune an Amplifier For Subwoofers (Step by Step)

Norvan Martin

You can greatly enhance the sound quality of your audio system by installing a subwoofer. Music lovers enjoy having subwoofers since they offer deep bass and add body and richness to your music. However, you need to properly tune your amplifier to get the best out of your subwoofer.

Sound quality is much improved when amplifiers and subwoofers are matched. Additionally, it guarantees that your audio system will continue to function at its peak level for as long as possible.

How then should the subwoofer’s amplifier be tuned? After you have successfully installed your audio system, you need to follow the steps below as these will help you properly tune your amplifiers for your subwoofers.

Amplifier settings

Before we discuss tuning, let’s look at some fundamental and often-used terms, characteristics, and functions that will aid in your understanding of the tuning procedure.

Important Terms That You Should Know


Gain is typically used to modify an amplifier’s sensitivity or amplification.  It also provides you with the estimated power consumption of your speakers. Gain lessens the annoying noise when the setting is lowered from its highest point. This will give you the maximum sound clarity and power. Check out our amplifier gain calculator to learn more.


Your subwoofer’s frequency determines what pitch sound is produced at. To correctly tune your amplifier, you must be aware of the range of your subwoofer. You must also properly set your crossover frequency for your sub.

Low And High-Pass Filters

You have complete control over the frequencies that will be sent to the output jacks using these settings. As a result, it offers personalized soundscapes based on your preferences. check out our guide to high and low pass filters to learn more.

Bass Boost

It is a function that amplifies the lower frequencies. Thus, subwoofers are used with it. It is suggested that you avoid using the settings unless necessary because they could be sensitive. Many people confuse bass boost with gain. Check out our guide to bass boost vs gain to learn more.

Peak Vs RMS Power

Do not be confused by Peak Power and RMS Power. The continuous power of the amplifier is gauged by its RMS Power. The amplifier’s rated power is the actual power that it can produce. It’s more of a wattage output average over a predetermined period.

The peak amount of power that the amplifier can produce or handle in a relatively short period, or a burst, is the best way to define peak power. It is more of a brief burst of power than the quantity of power the amplifier continuously emits.

Even though speaker and amplifier manufacturers advertise their Peak Power ratings to draw in customers, you want to consider the RMS Power as a determining factor when choosing the correct speaker and amplifier.

So let’s get started setting up your amplifier now that you are familiar with some of the fundamental terminology.

How to Tune Your Car Amp for the Subwoofer

Step 1: Try To Eliminate Any Distortion

Start by playing some music with the amp gain set to low. As soon as you hear distortion, turn up the volume. Find the exact volume level at which the distortion ends by gradually reducing the volume. This is the setting where you can play music without distortion.

Now increase the amp’s gain until the distorted sound reappears. Now your amp’s gain can be adjusted. Reduce the volume till it is comfortable.

Step 2: Flatten The Signal While Activating The Low-Pass Filter

Now retain the gain and low-pass filter settings on the sub’s amplifier for rich sound quality. Next, tweak the bass boost to the ideal setting or turn it off entirely. By doing that, you can reduce the amount of unnecessary bass frequencies.

You must tune the receiver’s bass tone to zero or flat if you want an unrivaled listening experience. Turn off the low-pass filter and just concentrate on minimum filtering. It works wonders for honing the low notes.

It is always a good idea to choose the setting that best suits your needs. A distorted sound is produced when you attempt to overlay various configurations of bass boosts, low-pass filters, and crossovers at the same time.

Step 3: Correct Low-Pass Filter And Subwoofer Gain Adjustment

Start this step by utilizing your receiver to play music while maintaining the volume at a quarter. Increase the gain on the subwoofer amplifier until the subwoofer’s sound can be heard via other speakers without any distortion.

Amplifier LPF

Turn the low-pass filter of your subwoofer’s amplifier down gradually while listening to music until you can no longer hear the mid and high-frequency sounds. 

Since you don’t want your subwoofer to play those musical notes, the low-pass filter will filter them out. Additionally, it functions as a controller to record the borders of the sound of a drum. Leave off the low bass and percussion while keeping the cymbals, guitars, vocals, and strings out.

Step 4: Understanding The Bass Boost

The prudent usage of bass boost is a crucial component of how to tune an amp for a sub. Therefore, adjust the setup and experience the bass drum’s sounds. Keep in mind that adding a small amount of bass boost can result in several kicks. Use the bass boost setting with great caution because this is where distortion starts. 

What Is Bass Boost

Reduce the amp’s subwoofer’s gain until you can no longer hear distorted sound. If your subs are ported, you can use the amp’s subsonic filter to essentially overdub the low tone. As a result, it aids in lowering the sound note volumes that cause the enclosure to resonate.

To discover a setting that sounds good to you, you need to continuously tweak your system. You can change the volume of the subwoofer to your preferred level by utilizing the remote’s bass knob or the sound receiver’s adjustment menu.

Step 5: Match The Amplifier And Subwoofer Volume Levels

Start by increasing the amplifier’s volume until there is no distortion and it is at its highest setting. Increase the sub’s volume gradually until the bass tones are consistent with other noises. Additionally, you can adjust the level control up and down or slightly increase the remote bass boost to get a sense of how it sounds.

Sometimes subwoofers have a hard time blending their sound with the rest of the unit’s sound waves because of the space in your automobile. Reversing the speakers in the subwoofer might occasionally help if the bass has a lot of volume but lacks the impact you’re looking for.

As a result, it flips the cone of the sub around. The sound waves would be better able to stay together than the other. The optimum approach should, in the end, be whichever produces the finest sound.


The technique of tuning amplifiers for subs is really simple once you know the steps to follow. You can follow all the steps as they are explained, or you can add your own twist where necessary. What’s important is that in the end, you will enjoy a thundering sound with powerful bass.

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Norvan Martin is the founder of He is a professional Electronics Engineer and is passionate about home theater systems and AV electronics. BoomSpeaker was created as an online hub to share his knowledge and experiences as it relates to home theaters and home audio electronics. My email: [email protected]  Connect on Pinterest and Linkedin