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OnePlus Open Audio test

OTHER AVAILABLE TESTS FOR THIS DEVICE

We put the OnePlus Open through our rigorous DXOMARK Audio test suite to measure its performance both at recording sound using its built-in microphones, and at playing audio back through its speakers.
In this review, we will break down how it fared in a variety of tests and several common use cases.

Overview


Key audio specifications include:

  • Three speakers (Top left, top right, bottom right, when unfolded)
  • No jack audio output

Scoring

Sub-scores and attributes included in the calculations of the global score.

OnePlus Open
OnePlus Open
135
audio
131
Playback
127

158

127

149

148

162

124

162

121

157

143
Recording
134

147

127

146

132

159

113

170

145

Best

152

166

Playback

Pros

  • Very pleasant, warm timbre
  • Stereophony in portrait orientation (when unfolded)
  • Excellent artifacts performance

Cons

  • Very limited upper treble and high-end extension
  • Minimum volume too quiet
  • Dynamics performance is hindered by compression
  • Aside from portrait stereophony, unremarkable spatial performance

Recording

Pros

Cons

  • Midrange can lack clarity, treble lacks high-end extension
  • Struggles at high sound pressure levels

With an overall score of 135, the OnePlus Open delivered a good performance in the DXOMARK Audio tests. Thanks to an additional speaker, it is one of very few foldable phones that offer stereo rendition in portrait orientation while unfolded, making better use of its design and large dimensions and providing better immersivity than most competitors.

In our tests, the OnePlus was consistently good across all use cases, thanks to a very pleasant timbre in both playback and recording. Our testers liked the device’s effective audio zoom feature, but also noticed some flaws such as a lack of high-end extension, a sometimes overzealous dynamics processing and compression in both playback and recording. According to the measurements, neither the built-in speakers nor the microphones offer a full frequency range, which is unusual for a device in this class. However, this did not prevent the OnePlus from delivering a satisfying timbre, and a solid performance in our tests.

Test summary

About DXOMARK Audio tests: For scoring and analysis in our smartphone audio reviews, DXOMARK engineers perform a variety of objective tests and undertake more than 20 hours of perceptual evaluation under controlled lab conditions.
(For more details about our Playback protocol, click here; for more details about our Recording protocol, click here.)

The following section gathers key elements of our exhaustive tests and analyses performed in DXOMARK laboratories. Detailed performance evaluations under the form of reports are available upon request. Do not hesitate to contact us.

Playback

131

OnePlus Open

163

Black Shark 5 Pro
How Audio Playback score is composed

DXOMARK engineers test playback through the smartphone speakers, whose performance is evaluated in our labs and in real-life conditions, using default apps and settings.

In playback, the OnePlus Open offered a pleasant timbre with a homogenous tonal balance. Midrange was especially warm and satisfying, but a lack of upper treble resulted in a certain dullness when listening to music. Bass sounded pretty strong and round, but it lacked low-end extension. The dynamics performance was overall decent, but notably hindered by compression at high volume. Attack sounded sharp and precise when listening to music or watching movies, but appeared slightly weak when gaming. Its rendition was also less satisfying at soft and maximum volumes. As for bass rendition, it offered good sustain, but envelope accuracy was impaired by compression, which also had a negative impact on punch.

Thanks to a third speaker on the top left of the device, the OnePlus Open is one of the rare, few foldables that offer stereophony in portrait orientation in addition to landscape. However, the spatial performance still left some room for improvement. To start with, in our tests, the third speaker was very quiet, which meant that neither balance nor wideness were actually good in portrait orientation, despite the stereophony. The results in landscape orientation were not particularly impressive either. The stereo image was not too wide, and while localizability was correct, it was not always easy to pinpoint individual sound sources. Distance rendition was pretty good, but voices could sound slightly more distant than expected.

Volume step distribution was quite consistent and the maximum volume setting was fairly loud, but our experts found the minimum volume step to be extremely quiet and therefore hardly usable. The artifacts performance was very good, however, with only some compression noticeable at both nominal and maximum volume, which was generally not problematic for the listening experience. In addition, the device’s built-in speakers were pretty much impossible to occlude.

Listen to the tested smartphone’s playback performance in this comparison with some of its competitors:

OnePlus Open
Samsung Galaxy Z Fold5
Apple iPhone 15 Pro Max
Recordings of the smartphones playing some of our music tracks at 60 LAeq in an anechoic environment by 2 microphones in A-B configuration, at 30 cm
Here is how the OnePlus Open performs in playback use cases compared to its competitors:
Playback use-cases scores

Timbre

127

OnePlus Open

158

Black Shark 5 Pro

The Timbre score represents how well a phone reproduces sound across the audible tonal range and takes into account bass, midrange, treble, tonal balance, and volume dependency. It is the most important attribute for playback.

Music playback frequency response
A 1/12 octave frequency response graph, which measures the volume of each frequency emitted by the smartphone when playing a pure-sine wave in an anechoic environment.

Dynamics

127

OnePlus Open

149

Black Shark 5 Pro

The Dynamics score measures the accuracy of changes in the energy level of sound sources, for example how precisely a bass note is reproduced or the impact sound from drums.


Spatial

148

OnePlus Open

162

Black Shark 5 Pro

The sub-attributes for spatial tests include pinpointing a specific sound's location, its positional balance, distance, and wideness.


Volume

124

OnePlus Open

162

Black Shark 5 Pro

The Volume score represents the overall loudness of a smartphone and how smoothly volume increases and decreases based on user input.

Here are a few sound pressure levels (SPL) measured when playing our sample recordings of hip-hop and classical music at maximum volume:
Hip-Hop Classical
OnePlus Open 75 dBA 73.5 dBA
Samsung Galaxy Z Fold5 72.8 dBA 69.4 dBA
Apple iPhone 15 Pro Max 75.1 dBA 72.3 dBA
The following graph shows the gradual changes in volume going from minimum to maximum. We expect these changes to be consistent across the range, so that all volume steps correspond to users’ expectations:
Music volume consistency
This line graph shows the relative loudness of playback relative to the user selected volume step, measured at different volume steps with a correlated pink noise in an anechoic box recorded in axis at 0.20 meter.

Artifacts

121

OnePlus Open

157

Asus ROG Phone 5

The Artifacts score measures the extent to which the sound is affected by various types of distortion. The higher the score, the less the disturbances in the sound are noticeable. Distortion can occur because of sound processing in the device and because of the quality of the speakers.

Playback Total Harmonic Distortion (Maximum Volume)
This graph shows the Total Harmonic Distortion and Noise over the hearable frequency range.
It represents the distortion and noise of the device playing our test signal (0 dB Fs, Sweep Sine in an anechoic box at 40 cm) at the device's maximum volume.

Recording

143

OnePlus Open

157

Black Shark 5 Pro
How Audio Recording score is composed

DXOMARK engineers test recording by evaluating the recorded files on reference audio equipment. Those recordings are done in our labs and in real-life conditions, using default apps and settings.

When used as a recording device, the OnePlus delivered a good tonal balance across all use cases. With the main and front cameras, treble was correct but would have benefited from some additional high-end extension. It appeared clearer with the memo app. Midrange was satisfying and natural in all use cases, and while bass rendition was good, it lacked low-end extension and depth. Thanks to a very effective noise-reduction algorithm, the signal-to-noise ratio was good when recording with the main and front cameras. Attack was generally sharp and precise, but at high sound pressure levels, such as when recording loud concerts, compression resulted in a lack of sharpness.

Wideness of the sound scene and localizability of individual sound sources were very good when recording with the main camera. With the front camera, wideness was more restricted, but localizability remained good. In addition, distance rendition was realistic across all recording apps. Recording loudness was adequate with the main and front cameras, but slightly weaker with the memo app. Recordings made with the OnePlus were mostly free of artifacts, except for some compression at high sound pressure levels, mostly. Background rendition was excellent too, and free of noticeable artifacts.

Here is how the OnePlus Open performs in recording use cases compared to its competitors:

Recording use-cases scores

Timbre

134

OnePlus Open

147

Honor Magic3 Pro+

The Timbre score represents how well a phone captures sounds across the audible tonal range and takes into account bass, midrange, treble, and tonal balance. It is the most important attribute for recording.

Life video frequency response
A 1/12 octave frequency response graph, which measures the volume of each frequency captured by the smartphone when recording a pure-sine wave in an anechoic environment.

Dynamics

127

OnePlus Open

146

Black Shark 5 Pro

The Dynamics score measures the accuracy of changes in the energy level of sound sources, for example how precisely a voice's plosives (the p's, t's and k's, for example) are reproduced. The score also considers the Signal-to-Noise Ratio (SNR), for example how loud the main voice is compared to the background noise.


Spatial

132

OnePlus Open

159

Vivo X Fold

The sub-attributes for spatial tests include pinpointing a specific sound's location, its positional balance, distance, and wideness on the recorded audio files.

Recording directivity
Directivity graph of the smartphone when recording test signals using the camera app, with the main camera. It represents the acoustic energy (in dB) over the angle of incidence of the sound source. (Normalized to the angle 0°, in front of the device.)

Volume

113

OnePlus Open

170

Black Shark 5 Pro

The Volume score represents how loud audio is normalized on the recorded files and the how the device handles loud environments, such as electronic concerts, when recording.

Here are the sound levels recorded in the audio and video files, measured in LUFS (Loudness Unit Full Scale); as a reference, we expect loudness levels to be above -24 LUFS for recorded content:
Meeting Life Video Selfie Video Memo
OnePlus Open -26.8 LUFS -21 LUFS -19.2 LUFS -19.1 LUFS
Samsung Galaxy Z Fold5 -25.8 LUFS -22.1 LUFS -21 LUFS -21.1 LUFS
Apple iPhone 15 Pro Max -24.9 LUFS -22.1 LUFS -20.5 LUFS -19.2 LUFS

Artifacts

145

OnePlus Open

Best

The Artifacts score measures the extent to which the recorded sounds are affected by various types of distortions. The higher the score, the less the disturbances in the sound are noticeable. Distortions can occur because of sound processing in the device and the quality of the microphones, as well as user handling, such as how the phone is held.

In this audio comparison, you can listen to the way this smartphone handles wind noise relative to its competitors:

Recordings of a voice sample with light background noise, facing a turbulent wind of 5 m/s

Background

152

OnePlus Open

166

Black Shark 5 Pro

Background evaluates how natural the various sounds around a voice blend into the video recording file. For example, when recording a speech at an event, the background should not interfere with the main voice, yet it should provide some context of the surroundings.

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