I found a frequency response measurement of the HE400i that is more accurate than the ones I previously used in my equalizer settings. I discovered a way to extract the graph data from Rtings.com. Rtings.com has measurements of lots of headphones, and their methodology is one of the most accurate. So, I imported their data into Room EQ Wizard and created an equalizer profile to correct the frequency response of my HiFiMan HE400i.
Measurements and Correction
I came up with the filters manually. I’m choosing not to boost the troughs or over-correct the treble to prevent side effects that arise when any particular listener’s ears don’t exactly match this graph.
May 26, 2020 update: MXPro_stock.txt has been updated with better measurements and EQ techniques! Go download it again in the “Frequency Response Correction” section.
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.
Analysis in Stock Form
You can refer to this graph to adjust your equalizer setting in the Dolby app, but to get much better sound, read on.
After a year of listening to my HE400i with the previous equalizer settings I made, I decided to use a less aggressive version that only corrects the obnoxious treble peaks and compensates for the sub-bass deficiency.
The front facing speakers on the Nexus 6P are relatively potent. These measurements were made with the phone standing horizontally, supported by a pillow. The UMIK-1 measurement microphone was about 20cm from the 6P, and pointing perpendicular to the screen.
Please ignore everything below 250Hz! The 6P doesn’t produce enough volume at those low frequencies to be detectable over the noise floor.
Unlike most other headphone surround sound emulators, Waves NX does a relatively good job at preserving the quality of the original sound while simulating an out-of-your-head soundstage. But let’s see how it actually changes the sound.
I loaded a 192KHz Dirac delta impulse into Adobe Audition and applied Waves NX to it with these settings:
Sending an impulse on the left channel yields this:
These are some frequency response measurements of the 2012 Mercedes-Benz GL-Class’s optional Harman Kardon in-car sound system. While its frequency response is far from neutral, this 12-speaker sound system is quite enjoyable to the ear. The sub-bass boost compensates for the engine noise, and the treble roll-off makes a non-fatiguing sound, which is especially appreciable for long road trips.