[Xperia Z2 General] sam_conrad:
DISCLAIMER: I'm no audiophile, but I have very good pitch, and a brain.

I also recommend against using ClearAudio+ (I'll explain why at the end) but instead using equalizer settings to tune music for a specific headset.

Hi everyone! When I first received my Sony Xperia Z2, I had just lost my favorite pair of in-ear headphones, a set of Kramer-modded JVC HA-FX35, and were stuck with the stock MH410c earbuds. Needless to say, these were very poor sounding, and only marginally improved with the Sony 5-band equalizer. I found the Digital Noise Cancelling MDR-NC31EM could be of use to me, so I ordered a pair.

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What I found in these two headsets is as follows:

MH410c - extremely forward, boxy (think cheap speakers playing in a cardboard box) and congested / stuffy sounding midrange, lacking bass extension below ~200 hz and heavy treble fall off after 8 khz, with instruments and voices bleeding over top of each other with cloudy attack (beginning of sounds are not sharp)

MDR-NC31EM - very bass heavy, full sounding, otherwise relatively flat from ~1khz into the upper midrange but lacking definition in sounds above the vocal range such as hi-hats and symbols with a smothered type sound. Some users prefer this kind of experience (think Dr. Dre Beats) but I'd rather stray away. Once I bought the noise cancelling headset, I proceeded to work on an equalizer to balance out the sound on Android 4.4.2. The old earbuds, I packed up in case I would need it someday. I found that even though I could correct the frequency response pretty well, but highs (hi-hat) were somewhat grainy and lacking true detail.

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Here's where the new update comes in. With the 4.4.4 update, Sony incorporated a new set of audio settings. Included with the new build, are preset equalizers for several Sony headsets.

These are designed to give each headset a more flat frequency response curve to enhance the accuracy and sound quality. They work pretty well, however I found that both the MH410 and MDR-NC31EM presets make the headsets sound grainy and gritty in the highs due to the distortion created by heavily boosting these frequencies. Noise Cancellation is not available without selecting the MDR-NC31EM preset.

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The MH410 preset flattens sound out pretty well. Lower midrange is still a bit prevalent and there is some lingering harmonic distortion in the midrange with grainy highs above 12khz. I found the following equalizer settings to work well over top of the preset:

400 hz: -2

1 khz: -2

2.5 khz: -1

6 khz: +1

16 khz: -2

Clear Bass: +2

This helps further control the midrange and removes some grain out of the upper highs. Some depth is added to the sound without too much sibilance at 6 khz. Adding more bass is worthless, as it muddies the sound because Sony is already heavily boosting the bass in the preset.

The MDR-NC31EM preset instantly adds clarity and treble extension to the headset. Treble is increased, and treble now extends up closer to top-end 20 khz much better than it did before, albeit with some distortion and grain. The bass is very slightly reduced, and tightened up somewhat. The overall sound feels much less sloppy and more like something I would enjoy listening to, though mostly still feels full and warm.

My equalizer settings applied over the preset:

400 hz: -2

1 khz: +1

2.5 khz: +1

6 khz: +2

16 khz: -2

Clear Bass: 0

This helps bring out the midrange which felt somewhat recessed to me, and slightly reduces the grainy upper treble.

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ClearAudio+: Why not use it? It's supposed to optimize sound settings, but often does the opposite. ClearAudio+ I've found helps in only one situation, when you need to boost front-facing speaker volume in a loud area.

Regardless of what headphones you have plugged in, ClearAudio+ typically does two things: Boosts upper midrange and treble, and automatically reduces the stereo width (stereo sound) which you can also do separately by applying similar settings in the equalizer and setting the "Surround sound (VPT)" settings, specifically the "Studio" option.

ClearAudio+ in my opinion is nothing more than a gimmick, some people perceive extra treble as extra clarity, but this is not the case. You lose definition in lower voices such as guitars, trombones, baritone voices, or what else you may be listening to with this option enabled.

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In conclusion, I hope this thread helps other Xperia Z2 (as well as Z3, Z3v users, if they read it!) understand the new audio settings and the optimal way to use them. My example equalizer settings are nothing more than examples and what I prefer, you have different ears that were made a different way and you may prefer something slightly different. I'm a little deaf anyway from years of trumpet playing and concerts though I still have a pretty good ear. :o

I hope you find this helpful, and if you do or don't, feel free to input your thoughts and hit the thanks button! :D