Xiaomi Redmi Note 9 Pro has earned its popularity due to its excellent balance of price and performance, but some users periodically face a situation where standard media volume or conversational speaker becomes insufficient. This can happen for various reasons: from the software limitations of regional versions of the firmware to the banal contamination of the speaker grid or changes in settings after a system update. If you often watch videos in noisy places or listen to music without headphones, the issue of increasing the sound pressure level becomes critical for comfortable use of the gadget.
In this guide, we will not only discuss the standard customization methods available to each user through the settings menu, but also more advanced methods, including activating hidden functions through the engineering menu and using specialized software. It is important to understand that maximum amplification often requires a comprehensive approach that combines software calibration and physical maintenance of the device. Before starting any manipulation of system parameters, it is recommended to familiarize yourself with the risks, although the methods described below are mostly safe when executed accurately.
Basic setup of multimedia and calls
The first step should always be to check the standard volume sliders, as in the MIUI shell they are divided into several independent channels. Often it happens that the user increases the volume of the ringtone, forgetting about the media track, or vice versa. To access the full control menu, press one of the physical buttons for adjusting the sound on the side of the case, and then tap the tripole or arrows down on the scale that appears to unfold all available sliders.
Make sure that the Multimedia slider is twisted to the maximum if you watch videos or listen to music. Special attention should be paid to the feature “Ampt up sound”, which can be activated in advanced audio settings. To do this, go to Settings → Sound and vibration → Sound quality and effects. Here it is worth experimenting with preset equalizer profiles, choosing the “Pop”, “Rock” or “Bright” modes, which often give a subjective feeling of higher volume by raising certain frequencies.
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Use Bright mode in the MIUI equalizer to watch videos – it automatically raises high frequencies, making the speaker’s speech clearer and louder without distorting the bass.
Also in this section, it is useful to activate the Mi Sound Enhancer option if available in your firmware version.This algorithm adapts the sound picture to the type of headphones or speakers connected, which can significantly improve perceived volume. Do not ignore the Dolby Atmos settings if they are present in your version of the system, since the correct profile selection (for example, Dynamic or Film) often adds several decibels to the output signal.
Use of the Engineering Menu for Calibration
One of the most effective ways to solve the problem of quiet sound is to adjust the parameters through the engineering menu, which is a hidden part of the system designed for testing equipment, but it allows you to manually change the volume limits for various use cases. To get there, open the Phone app and type in the combination # # #6484##, which will launch the CIT (Customer Information Test) menu.
In the test list that opens, you'll find a section that's related to audio, which can be called Speaker, Receiver, or Audio. Inside, you'll see a table with parameters where you can adjust levels (Gain) for different modes of operation. Be very careful: changing values in graphs that you don't understand can lead to wheezing or total loss of sound. Usually, you just need to find a parameter responsible for media (Media Volume), and increase it by a few units, but not more than 10-15% of the factory value.
⚠️ Warning: Don't change the values in the engineering menu randomly. Write down the original numbers before making changes so that if the sound quality deteriorates, you can return all settings back.
Once you make the changes, be sure to restart the device to apply the new settings. If the sound gets too loud and starts cracking at its maximum, go back to the menu and reduce the value by 1-2 points. This method is especially effective on global firmware versions, where software restrictions can be stricter than in the Chinese versions of Xiaomi.
What if the code doesn't work?
Third-party amplifiers
When regular funds are scarce, specialized applications from the Google Play store come to the rescue, which can programmatically amplify the audio stream beyond standard operating system limits, leading in this category are applications like Volume Booster GOODEV or Super Volume Booster, which work by creating an additional layer of signal amplification that is passed through the standard audio output.
When using such programs, it is important to remember the golden mean: setting the gain above 20-30% often leads to digital distortions and wheezing that can damage the speaker membrane. Most applications have a warning about the risks of exceeding a certain threshold. It is recommended to start with minimum boost values (5-10%) and increase them only if the sound quality remains acceptable.
- 🚀 Volume Booster GOODEV — Simple interface, allows you to quickly add up to 60% volume, but requires caution.
- 🎚️ Precise Volume – offers fine tuning to 100 volume steps instead of the standard 15, allowing you to find the perfect balance.
- 🎵 Equalizer & Bass Booster – combines equalizer and amplifier, useful for customizing specific genres of music.
Keep in mind that running these apps in the background can slightly increase battery consumption. In addition, some heavy games or video players with their own audio engine may ignore system amplifiers, so check the application in those scenarios where you lack sound.
Cleaning and physical maintenance of speakers
Often, the silent sound is not caused by software failure, but by the banal pollution of the output holes of the speakers. In the Redmi Note 9 Pro, the multimedia speaker is located on the lower end, and the conversational speaker is located at the top of the screen, hidden under a thin grille. Over time, dust, pile from pockets and skin fat are stuffed into these holes, which creates an acoustic stopper and significantly reduces the volume.
To clean, use a soft toothbrush with dry bristles. Carefully, without pressing hard, walk around the speaker grid to knock out the accumulated dirt. You can also use a special electronic cleaning fluid by applying a couple of drops to the brush (but do not pour liquid directly onto the phone!).
☑️ Cleaning the speakers
There is also a software cleaning method that helps push water out after moisture or soften dense dust, and you can play a special low-frequency vibration soundtrack (available on YouTube for "sound wave cleaner") at maximum volume for 1-2 minutes.
Comparison of sound amplification methods
The choice of volume increase method depends on your technical training and the desired result. Below is a table that helps to determine the best way to solve the problem for various situations.
| Method | Difficulty | Efficiency | Risk to the device |
|---|---|---|---|
| MIUI settings | Low. | Medium | Absent. |
| Engineering menu | Tall. | Tall. | Medium (with carelessness) |
| Booster applications | Low. | Tall. | Low (wheezing possible) |
| Physical cleaning | Medium | Depends on pollution | Low. |
As you can see from the table, the safest and often most effective method is a combination of physical cleaning and a competent equalizer setup: the engineering menu should be used only if you are confident in your actions, and third-party applications should be used as a temporary solution for specific tasks that require maximum volume.
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The combination of methods gives the best result: first clean the speaker, then set up the equalizer, and only if this is not enough – use a software booster.
Frequent problems and their solution
Sometimes users are faced with a situation when after updating the system the sound becomes quieter or whistle appears. This can be due to driver conflict or resetting the audio codec settings. In such cases, resetting the audio settings to factory values through the Settings menu → Advanced Settings → Recovery and resetting → Resetting Wi-Fi, mobile Internet and Bluetooth settings (this reset often affects audio profiles).
Another common problem is activating the Absolute Volume feature when connecting Bluetooth devices, which can conflict with system settings. You can turn it off from the Settings menu → Bluetooth → (three dots in the corner) → Turn on absolute volume (you need to switch the slider to the off position). This often solves the problem of quiet sound in wireless headphones and speakers.
⚠️ If the sound is completely gone or became extremely quiet immediately after the fall of the phone or water, software methods may not help - probably damaged plume speaker or module itself, requires diagnosis in the service.