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Audio quality of OnePlus 6

Recording of SE test sequences, played back by OnePlus 6 smartphone

Figure 1. Recording of SE test sequences, played back by OnePlus 6 smartphone. Standard SE test sequence includes 10 test signals and two hours of music material.

 

Thanks to Kostya, who has shared his OnePlus 6 smartphone for testing, we have its objective audio measurements, preformed in accordance with SE df-metric:

Df-slide showing location of various test signals (including 2 hours of music) on Df scale according to their levels of degradation

Figure 2. Df-slide showing location of various test signals (including 2 hours of music) on Df scale according to their levels of degradation. Artifact signature of OnePlus 6 is similar to the one of Apple portable devices. Df-slides of various players can be compared to each other on the Portable players page.

 

Conclusion:

Audio quality of OnePlus 6 is in line with top smartphones, including Apple iPhones. They all sound similar, at least with 32 Ohm headphones.


 

Appendix

 

1. Diffrograms of 35 tracks of the test set “Variety”, played back through OnePlus 6 smartphone. They show level of waveform degradation of the musical signal divided into 400ms chunks (one pixel each). Median Df values of the tracks are indicated. Click a track to open in full size for quick comparison with similar tracks from another device. More about diffrograms → Diffrogram: visualization of signal differences in audio research.

All-off
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35
OnePlus6 - Variety - 1 OnePlus6 - Variety - 2 OnePlus6 - Variety - 3 OnePlus6 - Variety - 4 OnePlus6 - Variety - 5 OnePlus6 - Variety - 6 OnePlus6 - Variety - 7 OnePlus6 - Variety - 8 OnePlus6 - Variety - 9 OnePlus6 - Variety - 10 OnePlus6 - Variety - 11 OnePlus6 - Variety - 12 OnePlus6 - Variety - 13 OnePlus6 - Variety - 14 OnePlus6 - Variety - 15 OnePlus6 - Variety - 16 OnePlus6 - Variety - 17 OnePlus6 - Variety - 18 OnePlus6 - Variety - 19 OnePlus6 - Variety - 20 OnePlus6 - Variety - 21 OnePlus6 - Variety - 22 OnePlus6 - Variety - 23 OnePlus6 - Variety - 24 OnePlus6 - Variety - 25 OnePlus6 - Variety - 26 OnePlus6 - Variety - 27 OnePlus6 - Variety - 28 OnePlus6 - Variety - 29 OnePlus6 - Variety - 30 OnePlus6 - Variety - 31 OnePlus6 - Variety - 32 OnePlus6 - Variety - 33 OnePlus6 - Variety - 34 OnePlus6 - Variety - 35
-30.1 -25.1 -25.2 -32.9 -26.3 -26.7 -31.7 -24.6 -23.8 -23.5 -27.6 -22.9 -23.0 -27.6 -35.4 -26.0 -29.2 -25.2 -32.9 -37.8 -31.4 -23.4 -25.0 -21.3 -27.2 -26.8 -23.7 -20.6 -26.6 -26.0 -25.7 -20.8 -34.1 -25.5 -28.2

 

 

2. Dendrogram of similarity of artifact signatures for the portable players.

Dendrogram showing similarity of artifact signatures of tested players

Figure 7. Dendrogram showing similarity of artifact signatures of tested players. The shorter the link between two players, the more similar their artifact signatures.

 

 

Table 1. Underlying matrix of Spearman distances between artifact signatures for the dendrogramm. The Spearman distance = 0.1 is critical for relation of Df measurements to subjective scores. For the players that have similar artifact signatures (distance < 0.1) their perceived sound quality correlates well to df-measurements performed with substantial amount of real-life music material (histogram medians).
     (1)    (2)    (3)    (4)    (5)    (6)    (7)    (8)
 (1) Apple iPad mini 2
(2) HTC Desire C
(3) HTC Desire C (ba)
(4) Shanling M2s
(5) Shanling M2s (HighGain)
(6) Shanling M2s (gradual)
(7) Apple A1749 adapter
(8) OnePlus 6
        0.0619 0.0972 0.0445 0.0446 0.0334 0.0374 0.0111
0.0619        0.0655 0.0149 0.0147 0.0174 0.1494 0.1029
0.0972 0.0655        0.0651 0.0651 0.0660 0.1710 0.1306
0.0445 0.0149 0.0651        0.0002 0.0024 0.1378 0.0887
0.0446 0.0147 0.0651 0.0002        0.0025 0.1379 0.0888
0.0334 0.0174 0.0660 0.0024 0.0025        0.1229 0.0752
0.0374 0.1494 0.1710 0.1378 0.1379 0.1229        0.0095
0.0111 0.1029 0.1306 0.0887 0.0888 0.0752 0.0095        

 

 

 

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For almost 20 years SoundExpert is the home for innovative audio measurements and research. Newly developed listener-centric audio metric combines instrumental measurements with listening assessments and helps to perform both more efficiently.

Since 2001 more than 10 000 volunteers participated in distributed blind listening tests on Soundexpert website. Sound quality ratings of 100+ codecs were computed thanks to their time and efforts. You can still take part in them.

Recently we developed a new method for instrumental measurements of audio equipment. It is based on the new audio metric and helps to examine technical performance of an audio device in great detail. Furthermore all audio devices can be grouped according to their sound signatures. The measurement procedure was fine-tuned during two years of beta-testing with 30+ portable devices. Now it is mature enough for production environment. First few tested players can be found on Portable players page.

I hope this new audio metric will attract more audio engineers and enthusiasts as it opens new field of audio research where objective and subjective are not separated anymore. Further advance in the research requires many more different audio devices to be tested - a serious challenge for our non-commercial research project. Fortunately portable players are good test subjects for this research, even the old ones. That's why I need some help from our volunteers again. If you have such old/previous/ex digital portable audio player or a smartphone that was marketed as "HQ audio inside", if it is fully functional but not in use anymore, please, consider donating it to SoundExpert. Its df-measurements will appear on the portable players page. Then it will be either kept for research purposes or sold off supporting the project additionally (or given away to some music lover if it can't be sold for some reason). I'm going to refund your postal expenses but can't confirm this right now. Please, contact me for further arrangements.

Manufacturers of portable devices can order df-measurements for their products. The cost of the work will be equal to retail price of the device. I will buy it and perform standard df-measurements. If you decide I will not publish results during a year.

Today building a comprehensive audio quality map of various audio devices on the market can be done by ourselves - audio consumers. And it's not hard indeed. In the end this will free up some time for listening and discussing Music, not technology )).

Thanks,
Serge Smirnoff
SoundExpert Founder