How to tune a Monoblock car Amp? (Detailed Guide 2023)

A monoblock amplifier is a very powerful amplifier that has one channel. People use it in their cars to make their music sound better by making their subwoofers play louder. But to get the best sound, the amplifier needs to be tuned.

Subwoofers need a lot of power to make deep bass sounds, and monoblock amps are good at giving them this power. Audio makes good monoblock amps that are known for being a good value and working well. With a monoblock amplifier, you can make your car music sound better and have more bass.

How to tune a monoblock car amp? If you want to make your car music sound better, you can use a monoblock amp and connect it to a subwoofer. If you want to learn how to use a monoblock amp, and how to install a monoblock amp in your car, this guide will help you do it easily. By tuning your amp and connecting it to a subwoofer, you can make your car music sound even better.


What is a monoblock amplifier?

Monoblock amps are basically single channel amplifiers. This doesn’t mean that it can push one speaker or run 1 subwoofer, monoblock amps are made to drive an entire full range system. Monoblock amp can be used with 1 tweeter, mid range driver and 1 woofer only!

Purpose of the guide

The purpose of the guide is to help people learn how to tune and install a monoblock amplifier, specifically a Skar 1200 amp or any other monoblock amp, in their car. The guide aims to provide step-by-step instructions and tips to help people get the best sound possible from their car audio system by properly tuning the monoblock amplifier and connecting it to a subwoofer.

By following the guide, readers can learn how to optimize their car audio system and enjoy a more immersive and satisfying music listening experience while driving.

How to tune a monoblock car amp?

monoblock car amp

Shut Down Everything:

Before tuning your monoblock amplifier, you should take two important steps. First, turn down the gain, which is a volume control on the amplifier. Second, turn off all the filters, which are adjustments that affect the sound quality.

Many people forget to do this, but it’s important to do these things to tune your amplifier correctly. The gain, low pass, and high pass filters can be found on the monoblock amplifier, so make sure to adjust them before you start tuning.

Gain Setting:

Using an RTA, adjust the gain so that the subwoofer is getting hit with approximately 75% of the power it’s rated for. Don’t pay much attention to how loud it is at this point, just get it figured out roughly. It will be significantly louder after following step 2.

Adjust the subsonic filter:

Using an RTA, set the subsonic filter so that you just start to see peaks at approximately 20hz. There will still be significant energy at frequencies below 20hz, but this is necessary to prevent ridiculous cone movement.

You want it able to move enough so that it doesn’t distort, but not so much that it can’t reach its natural resting point.

Fine Tune the Subsonic Filter and Phase Adjustment:

Now, using your ears and an RTA, pick out a few frequencies in the 20-30hz range that are bothering you. These might be peaks or nulls. Make sure to look at the group delay plot rather than just the frequency response graph. This will help determine if it is in fact a peak or null you are hearing.

Once you’ve found these peaks/nulls, use the subsonic filter to move them down an octave by using negative values (for example, -3 will move it 3 octaves below where it is now). You may find that you need to adjust the phase of the sub out by +/-180 degrees to get rid of some peaks/nulls in this range.

Adjusting the Phase and Crossover Frequencies for Maximum Output:

Now, using an RTA, set your crossover so that you are no longer seeing any major peaks/nulls between 20-80hz.

Next, using your ears and an RTA, set the phase of the sub channel to match the mains as closely as possible (you should not see too many peaks or nulls with just bass, but if you do use no more than +/-180 degrees).

If you can’t get it too look flat and smooth, that’s okay, you just want to minimize the corrective action.

Finally, set the crossover point on the front channels so that they are no longer playing anything in the 40-80hz range when you play a bass heavy track at reference volume. This will help maximize output.

Disable Bass Boost:

To achieve the best sound quality from your car speakers, it’s important to turn off the bass boost. If you don’t, it can cause distortion and negatively affect the sound. To turn off the bass boost, use a flat screwdriver to turn the bass boost knob to zero. This will ensure that the bass boost is disabled and won’t interfere with the sound quality of your car audio system.

What Does Bass Boost Mean?

The bass boost is a feature that can increase the low frequencies in your audio system. However, using it improperly can cause harm, so it’s best to avoid it altogether. While the bass boost can make the bass sound more powerful, it’s important to be cautious when using it to avoid damaging your speakers.

In general, it’s better to rely on other tuning methods to optimize your car audio system and avoid using the bass boost unless you are confident in how to use it safely.

The Frequency Range of Bass:

The bass frequency range is typically between 40-100Hz and is the range that will receive the boost if the bass boost feature is activated. This range is where you’ll hear the lower, deeper tones that give music its richness and depth.

By adjusting the bass frequency range, you can customize the sound of your car audio system to your personal preferences. However, it’s important to be careful not to overdo it, as too much bass can cause distortion and other issues with the sound quality.

Adjust the EQ:

Now we’re just going to start messing around with the EQ and seeing what we can get out of it. Tune for max output and try not to worry about how it sounds, just get as much output as possible.

Also Read: What are the causes that make a car amplifier hot?

Fine Tuning the EQ:

Now, using an RTA and your ears, use trial and error to reduce any peaks or nulls in the 20-70hz range so that it sounds as smooth as possible. This is where most of your sound quality comes from, so you want it to sound as good as possible.

Once you’ve got the amp sounding smooth in the low end, set all the gains so that they are just below clipping on your amps (this will probably mean turning them down about 20%).

Finally, using an RTA, set the crossover on the front speakers so that they are not playing any frequencies below 40-50hz. This will help maximize output and give you more headroom for loud bass transients.

Playback Volume:

The key to getting good sound quality out of a subwoofer is to ensure it is hitting as few peaks/nulls as possible between 20-80hz. It is much easier to EQ out peaks/nulls in this range than it is the lower frequencies, so getting them tuned in correctly will help you get good sound quality without spending too much time on EQ.

Once you have everything tuned for max output, you can turn up the playback volume until it starts to sound bad (where you can hear clipping on the bass), and reduce it until it sounds good again. Now, any peaks/nulls that show up will be louder than they were before, so you can either re-run your RTA and double check the EQ settings, or just leave it as is.

The point of this step is to reduce bass clipping and keep the sub sounding as good as possible.

Now, using an RTA and your ears, tune for sound quality by reducing any peaks/nulls in the 20-70hz range so that it sounds as smooth as possible. This usually entails EQing out a lot of nulls rather than boosting certain frequencies.

Once you’ve got the EQ looking good, turn up the playback volume until it starts to sound bad (where you can hear clipping with bass), and reduce it until it sounds good again. Peaks/nulls that show up in the sound quality tuning stage will be louder than they were before, so you can either re-run your RTA and double check the EQ settings, or just leave it as is.

Also Read: How to wire high level input on amplifier | Step by Step Guide

Test Drive:

Now you’re ready to go test drive your system! From here on out, it’s all about tweaking your system to ensure that everything sounds as good as possible with the kind of music that you like to listen to. Remember, if you don’t like the sound of any of your amps, it is very easy to swap them for different ones!

This all is about, How to tune a monoblock car amp? If you have any questions about how to get the most out of your system, feel free to post below in comments section. Thank you for reading!

Important Things to Keep in Mind During the Above Process

While the tuning process outlined above may seem simple, there are some important things to keep in mind to avoid potential issues.

Firstly, be careful not to set the gain too high, as this can damage your subwoofers or speakers. Additionally, when adjusting the low pass and high pass frequencies, it’s important to adjust them based on the specific capabilities of your speakers or tweeters.

It’s also important to avoid completely blocking all low pass or high pass frequencies, as this can significantly impact the sound quality. You may need to repeat the process a few times, so patience is key.

Lastly, it’s important to complete the tuning process in a quiet environment, as this will help you hear the speaker’s sound more clearly. Playing a familiar song during the process can also help you identify any distortion.

Manual Tuning of Monoblock Amp for Car Stereo Systems

To manually tune your monoblock amplifier, you don’t need any special skills or tools, but you need to be careful to avoid missing any distortions. Here are the simple steps you can follow:

  1. Turn off any special settings and filters and turn the gain down.
  2. Gradually turn up your car stereo until you hear distortion. Then, back it down to the sweet spot.
  3. Adjust the gain by gradually increasing it until you hear distortion, then back it off until it’s no more than 80% to avoid damaging your speakers.
  4. Turn on any special settings and filters you need.
  5. Repeat steps 2 and 3 until you find the sweet spot and reach 80% volume without distortion.
  6. If you still hear distortion, turn down the gain on the offending speaker until you get high-quality sound.

Is it possible to tune a Monoblock Amp using a Multimeter?

Certainly! However, tuning your monoblock amplifier using a multimeter is a more complicated process than the steps outlined above. By using a digital multimeter, you can measure the impedance of your speaker.

Understanding Speaker Impedance

Impedance is like a speaker’s resistance to the electric current from an amplifier. It tells us how much electric current can flow through a speaker at a certain level of voltage. If the impedance value is low, then the speaker can handle more power and more electric current will flow through it.

Using a digital multimeter to adjust and set up a Monoblock amplifier for optimal performance.

To tune your amplifier with a multimeter, here’s what you need to do:

  • Turn off the power to your speaker.
  • Set your multimeter to resistance mode.
  • Connect the red and black leads of the multimeter to the positive and negative terminals of the speaker.
  • Write down the speaker’s resistance (also known as impedance).
  • Look up the recommended wattage for your amplifier in the user manual.
  • Compare the wattage with the speaker’s resistance.

How to compare the recommended wattage of an amplifier with the impedance of a speaker?

To compare the recommended wattage of your amplifier with the impedance of your speaker, you’ll need to do some calculations using this formula: P = V2/R. “P” stands for power, “V” stands for voltage, and “R” stands for resistance.

Once you’ve found the corresponding voltage using the formula, you’ll need to follow these steps:

  • Disconnect all the accessories, such as speakers and subwoofers.
  • Set the equalizer to zero.
  • Set the gain to zero.
  • Adjust the volume in the head unit to 80%.
  • Play a test tone.
  • While the test tone is playing, turn up the gain knob until the multimeter reaches the voltage you calculated earlier.
  • Finally, connect all the other accessories back.
Important things to keep in mind

It’s important to keep the following things in mind:

  1. Make sure that your amplifier is connected to the power source during this process.
  2. Set your multimeter to measure AC Volts and connect it to the amplifier.

Is a properly tuned Monoblock amplifier better?

If you know how to properly tune a Monoblock amplifier, then it can greatly enhance your entertainment experience. One of the reasons Monoblock amps are good is that they can add powerful bass to your car audio system.

However, it’s important to choose an amplifier that can handle the power without overheating, and to use the right tips for tuning it to get the best experience.

Is a Monoblock amplifier a 2-channel amplifier?

Although a Monoblock amplifier has two outputs, it only has one channel. The reason for having two outputs is to make it easier to connect multiple subwoofers. It’s important to remember this when calculating the amplifier’s output voltage.

To calculate the voltage, you can use the formula V = √ (P x R), which is simpler than some other calculations. However, if you have an amplifier with multiple gain controls, you’ll need to treat each one separately when calculating the voltage.

Different types of Monoblock amplifiers

A Monoblock amplifier is an amplifier with only one channel that can produce low-frequency sounds and can send one signal to each speaker.

There are two different classes of Monoblock amplifiers:

Monoblock amplifiers of Class AB

If you want a high-quality Monoblock amplifier, then you should choose the Class AB model. When this amplifier detects an audio signal, it allows a small amount of power to flow to the switching device.

Monoblock amplifiers of Class D

Monoblock amplifiers of Class D also have only one channel, but their working mechanism is different from that of Class AB. They are smaller and require less power than Class AB amplifiers, but they may have lower sound quality.

Steps to Install a Monoblock Amplifier in Your Car

Here are the rest of the steps to install a monoblock amplifier in your car:

1: Mounting the Amplifier

To install your amplifier, you need to choose the right place to mount it. Many people choose to mount it under the driver’s or passenger’s seat as it provides an ideal location for all the wirings and connections for speakers, subs, and other peripherals. It also helps to keep the amplifier hidden and the cables well-organized.

It is crucial to ensure that the mounting location has proper ventilation to prevent the amplifier from overheating. Professionals recommend mounting the amplifier under the seat or in the trunk of the vehicle.

2: Connecting the Subwoofer and Enjoying the Sound

Connect the subwoofer wire to the amplifier and make sure it’s working properly. During the tuning process, you may come across subsonic filters, which can help reduce note intensity and improve sound quality. Once you turn on the power, sit back and enjoy the powerful bass in your car’s sound system.

3: Disconnect the Negative Terminal of Your Car Battery

Before starting any work, it is important to disconnect the negative terminal of the car battery. This ensures that there is no electrical power running through the car, making the installation process safer.

4: Plug in all the cords and wires

When setting up cables in your car, you will need to connect a ground cable, a power cable, a remote turn on wire, and RCA cables. The ground cable should be attached to a metal bolt on the car’s chassis, and the power cable should be connected to the battery’s positive terminal.

Connect the power cable to the fuse holder, which will then be connected to the amplifier’s positive terminal. The remote turn on wire and RCA cables should be run from the power wire and connected to the amplifier.

Make sure to remove any material that could disrupt the ground terminal’s connection, and keep all the wires hidden under your car’s carpet.

How do I adjust the LPF setting on my amplifier?

To adjust your amplifier, first play your favorite music at 75% volume. Then, set the LPF filter on your amp to the highest position. After that, lower the frequency until you can’t hear the high-pitched sounds from your subwoofers anymore.

What is the purpose of the Subsonic feature on an amplifier?

A subsonic is a device that makes the low sounds in music quieter. It makes those deep notes you feel in your body not as strong, so they don’t overpower the other sounds.

What frequency should bass be set to?

The Hz rating tells you the frequency range of a subwoofer, with lower numbers meaning deeper bass. For good bass, a subwoofer with a range of 20-120 Hz is a good choice. Many high-quality subwoofers have this range. If you care about good bass, make sure the Hz rating of the subwoofer you buy is below 80 Hz.

Adjusting the Crossover

A crossover is an audio device that separates audio signals into different frequency ranges before sending them to different speakers or subwoofers. It helps to ensure that each speaker or subwoofer plays the frequencies it can handle best, resulting in clear and balanced sound.

High-pass filters only allow frequencies above a certain point to pass through, while low-pass filters only allow frequencies below a certain point to pass through. A high-pass filter is typically used for main speakers, while a low-pass filter is typically used for subwoofers.

To adjust the crossover for optimal sound quality, follow these steps:

  • Set the high-pass filter on your main speakers to a frequency that allows them to play only the frequencies they handle best.
  • Set the low-pass filter on your subwoofer to a frequency that allows it to play only the frequencies it can handle well.
  • Adjust the crossover frequency until the main speakers and subwoofer work together seamlessly and there are no gaps or overlaps in the frequency range. This will result in clear, balanced, and optimal sound quality.

Final Steps

Here are some steps given below:

Tips for fine-tuning the amplifier:

  • Start by setting the volume at a comfortable listening level, then adjust the gain on the amplifier until the sound is clear and free of distortion.
  • Use a sound meter or audio test tone to ensure that each speaker or subwoofer is playing at the correct volume.
  • Adjust the equalizer to fine-tune the sound to your personal preference.

The importance of testing the sound system after tuning:

  • After tuning, it is important to test the sound system to ensure that everything sounds as expected.
  • Play different types of music and test different volumes to ensure that the sound is balanced and free of distortion.

Troubleshooting tips for common issues that may arise after tuning:

  • If there is no sound coming from a speaker, check the connections to ensure they are secure.
  • If the sound is distorted or too loud, reduce the volume or adjust the gain on the amplifier.
  • If there is a hissing or buzzing sound, check the ground connections to ensure they are properly connected.
  • If the sound is unbalanced or there are dead spots in the room, adjust the speaker placement or use room correction software.


Q:1 How do you tune a monoblock?

Firstly, make sure all the settings on your head unit are set to flat, meaning that bass boosts and other effects should be at the minimum level. Then, turn the head unit volume to the highest level possible without any distortion. After that, turn down all gains and bass boosts to the minimum. Finally, turn up the low pass to the maximum level.

Q:2 How do I properly tune my amp?

To tune your amp properly, you need to follow a few steps. First, set all the sound effects and bass boosts to the minimum level or turn them off on your head unit. Then, increase the volume on your head unit to the highest level possible without any distortion.

Next, turn down all gains and bass boosts to the minimum level to ensure that the signal going to your speakers or subwoofers is clean and free of distortion. Adjust the high-pass and low-pass filters to set the frequency range for your speakers and subwoofers.

The gain on your amplifier should also be adjusted until the sound is clear and distortion-free. Finally, fine-tune the equalizer to adjust the tone of your sound to your preference. After tuning, test your sound system with different types of music and at different volumes to ensure that the sound is balanced and free of distortion.

Q:3 How do I match my car amp with my subwoofer?

If you have multiple subwoofers, you need to calculate their RMS ratings by multiplying the number of subs with their RMS ratings. Then, you need to choose an amplifier that can power between 75% to 150% of the total RMS rating of all the subwoofers. This will ensure that your entire subwoofer system is powered properly and can deliver the best sound quality.

Q:4 What does bridging an amp do?

Bridging amplifier channels combines two stereo channels into one mono output channel. This is often used to provide more power to large full-range speakers in a two-channel system or home theater.

Bridging can also be used to power larger passive subwoofers that are placed in a room or in a wall. This technique helps to provide better sound quality and an overall better audio experience.

Q:5 Is it better to wire subs in series or parallel?

When you connect multiple subwoofers in series, the total impedance of the system increases. But, when you connect multiple subwoofers in parallel, the total impedance of the system decreases.

This means that parallel wiring of multiple loads can lower the total effective impedance, and series wiring of multiple subs can increase the total effective impedance.

This is important to consider when setting up your subwoofer system to ensure that it is properly wired and that you get the best sound quality.


Tuning a monoblock car amplifier is an important process to achieve optimal sound quality in your car audio system. By following these step-by-step instructions, you can tune your amplifier to deliver the best possible performance from your subwoofers.

Start by calculating the total RMS rating of your subwoofers and selecting an amplifier that can power them properly. Then, adjust the gain, crossover, and subsonic filters to achieve the desired sound quality.

Finally, test your system and make fine adjustments to get the best possible sound. With the right tools and some patience, you can tune your monoblock car amplifier and enjoy your music like never before.

We hope you will be well aware about how to tune a monoblock car amp step by step guide, after reading this comprehensive guide. If you have questions, feel free to comment below!

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