PSA: Please take this MXP user survey about issues and mods!
The MateBook X Pro has some of the best speakers on any ultrabook. Unlike most laptops, it has 4 speakers instead of 2: there are a pair of up-facing tweeters under the speaker grill and a pair of down-facing woofers on the laptop’s bottom corners. The crisp up-firing tweeters greatly enhance soundstage and imaging. Nevertheless, these speakers are not perfect, and here’s some ways we can improve them.
The MateBook X Pro's speakers have a pretty awful distortion at around 511Hz. Both my unit and another at a Huawei store have this problem, so it's most likely a design flaw instead of a defective unit. The cause appears to be the bottom of the speaker enclosure vibrating against the laptop's unibody shell, and the speaker's screws vibrating as well.
Peal off the foam seal around the speaker drivers. Now, the bottom lid no longer presses the speaker against the unibody.
Put a thin strip of sponge or similar soft material under the speaker to separate the resonating components.
Per my ear, this mod successfully eliminated the distortion except at absurdly high volumes.
Other than a reduction in low treble, the frequency response stays intact. Very fortunately, this mod doesn't reduce bass.
- Install Equalizer APO. Apply this fix while you're at it.
- Search for Configuration Editor in the Start menu and open it.
- You are now editing the main config.txt for EAPO. Delete the default example filters in there.
- Right click and download this EQ correction profile (MXPro.txt) and put it in %ProgramFiles%\EqualizerAPO\config.
- Include MXPro.txt.
- Install DynamiQ. This will give you the frequency response you want AND the volume you need.
Note: remember to turn this EQ off when using external sound equipment such as headphones.
I used Room EQ Wizard to generate a set of equalizer parameters that flatten (±2dB) the frequency response down to about 110Hz, which is the point beyond which the total harmonic distortion exceeds 10%. I used a high-pass to filter out the distortion-heavy frequencies below that. I refrained from boosting the top treble too much and gave it a smooth roll-off instead.
This is how the correction filters look in Equalizer APO. Notice that correcting the frequency response (especially extending the bass) requires some sacrifice of maximum volume. So, I created the DynamiQ algorithm to minimize this trade-off, to get excellent frequency response AND very loud maximum volume without switching between different EQ profiles. Go install it (and read about how it works) from Github. I swear this is gonna sound unbelievable compared to what MXPro normally sounds like.
Take my REW file if you want to fiddle around. It also includes a pre-modification measurement if you don't want to do the sponge mod.
Switching to generic Microsoft audio drivers in Device Manager disables the tweeters and makes the sound fecal. Don’t do it. Keep the default Realtek drivers.