Right now we have full data on four phones and partial data on a few more. We are working to compile as much data as possible to provide an overall look at the quality of audio from smartphones available today. The largest difference in current models is the power of the headphone output as some are much better equipped to drive more demanding headphones than others. As we compile data on more and more products we hope to see more differences arise.

We also have not seen much difference with different loads applied to the headphones. We will continue to test all three sets of headphones but the data here is for the Apple Earbuds. If different loads provide different results, then we will certainly report those different numbers in the future. It also appears that running Android phones in the automated routine causes the 20 kHz tone to be left out of the frequency response test. Humans usually can't hear this, I certainly can't, and so there isn't a huge amount of real-world ramification to this. It causes the reported THD+N to exclude that tone and provides a better result that phones that play it back. For the future, this will be done manually.

Here are the four phones we currently have, and more phones are being tested and reported on as quickly as possible to be added here.

Nexus 5 and LG G2 Issues Wrapping Up
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  • Impulses - Wednesday, August 13, 2014 - link

    It wouldn't really be a factor, the Bluetooth device's amp would be what's driving your headphones, not the phone's circuitry. Reply
  • blade 7 - Monday, February 17, 2014 - link

    while quality of music playback is certainly a major issue, one primary quality question hardly gets any mention, not to speak of objective examination: the quality of the phone call audio itself !
    it you conduct crucial negotations over the phone - or even if you just flirt with someone on you portable, the quality of voice call transmission can make a huge difference in how you - your message, business proposition, etc - are perceived on the other end of the call, and what impression yout gain from someone calling you. so where in the respective media is a systematic phone-call audio quality assessment ? ( and no, phone call audio quality is not equal to music file playback audio on a smartphone. we are talking much more elements of the phone involved and influencing phone call audio qu. compared to file playback quality.) a lot of modern smartphones sound very poor on voice calls ....
    Reply
  • Excerpt - Wednesday, February 26, 2014 - link

    Represent RIP city main! You did an amazing and scientific report I have high hopes for future articles and I'm really behind your trailblazing (another reference) the audio quality topic on our electronics!

    I did a wedding gig with a decent firewire audio interface, ran out of music (as the crowd wanted more current hip-hop) Hooked up my friends iphone and I was a little awestruck. My speaker amp was at about 80% and the iphone 5 was at about 90% volume and the distortion and quality did not seem to dip down at any noticeable amount, through the head phones or the floor speakers. WOW.

    I personally just bought the nexus 5 and yes, even at low levels being hooked up to my home stereo (which i do often) the quality and total max dBs are defiencent compared to the iphone. Crap-tastic infact, the left and right speakers even seem noticably out of phase or somehting to that effect. (I'll start using the S.O.'s ipad air if i need an emergency audio source in the future)

    Just verifiying this man's findings with real world examples. Thanks!
    Reply
  • Excerpt - Wednesday, February 26, 2014 - link

    Good point and I think there's some information to be discovered on that topic. However, I wanted to add, carriers are really responsible for increasing the quality of voice. The local recording of a mobile device is much better than the transmitted voice (not withstanding software enhancements eg. noise canceling). Check out, 3GPP and the ITU (International Telecommunications Union). There's some benchmarks that are measuring voice quality calls, but assisted with network simulators, as the network is also an important factor. Reply
  • @paulkind3d - Thursday, March 6, 2014 - link

    Call and sound quality are a huge part of mobile phone tech. I'm currently looking into the HTC One as it appears to have set a precedent on sound quality. Personally I am absolutely sick and tired of having to ask "huh, what?" over phone calls due to the crappy little garbage speakers in most cellphones. They are either a) loud enough to hear but are not clear or b) too quiet to hear and are not clear either. Either way hearing calls on cellphones is painful and difficult on every cell phone ive owned to date. I can live with a bulky cell phone if it means better sound personally. Sadly no one else thinks this way. Apparently till a phone is the size of a thumbnail and useless for calling people cellphones makers will not be satisfied.

    I know that this test does not compare that and is more of a DAC question as the test is geared to headphone sound quality (bonus that one of the test subjects is a grado headphone... grados are amazing... i love my sr325's). None the less, the fact that someone is out there testing audio quality of cell phones means that eventually we may be able to actually hear phone calls when we make/answer.

    BTW head-fi.org has many user posts on this same subject. If line level quality is important to you definitely search headfi too. This and many other compares can be found there... http://www.head-fi.org/t/685103/best-phone-for-mus...
    Reply
  • H0rtOn - Thursday, May 8, 2014 - link

    I read Anandtech alot and have never posted a comment before, but I signed up just to make this post. Please make this a standard part of your phone reviews. I specially missed this part in the review of the HTC One (M8). Reply
  • notsure123 - Friday, April 29, 2016 - link

    Old article. I would just like to point out the difference between driving apple headphones (or any headphones for that matter) vs a line input. Not to say this data is inaccurate, it is just not particularly useful in comparing smartphones audio quality. Firstly because I hope no one actually uses their smartphone with headphones at volumes even up to 80% where it might also start distorting. This is too loud and is damaging your hearing. I would like to see the distortion figures when connecting the headphone jack to an auxiliary input rather than a headphone and see how these phones compare (willing to bet its much more similar) Reply
  • Photosynthecis Media - Friday, March 6, 2020 - link

    It is important here to differentiate between the microphone and the rest of the audio system if you will because if the microphone is providing the input then its intrinsic response curve will apply kind of like a coefficient to what the audiio sys output is. Whereas an aux input other than the microphone would offer an output only affected by the frequency response characteristics of the amplification system, primarily the speakers, but not the microphones. Reply

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