We subjected the Oppo Find N2 Flip to our rigorous SBMARK audio test suite to measure its performance both when recording sound using its built-in microphones, and when playing audio through its speakers.

In this review, we’ll analyze how it performed in a variety of tests and several common use cases.

Overview


Key audio specs include:

  • Two speakers (bottom side and top front)
  • No audio jack output

Reproduction

Pros

  • Free of unwanted audio artifacts
  • Good localizability of sound sources in the audio scene
  • Accurate distance rendering

Against

  • Inconsistent tonal balance
  • Round attack and weak punch
  • Lack of depth

Registration

Pros

  • Natural stamp
  • Excellent range and localizability

Against

  • Lack of low-end extension and slightly inconsistent bass rendition when recording loud content, such as concerts
  • The signal-to-noise ratio could be better in urban scenarios, the background noise is quite intrusive

With a SBMARK audio score of 131, the Oppo Find N2 Flip performed quite well in our tests. As a playback device, it wasn’t quite as good as the foldable N2 with its large size in its unfolded state, but it had the edge in recording, delivering surprisingly good results.

The playback experience with the built-in speakers was virtually artifact-free and offered good localizability to individual sound sources. The sound signature was a bit dark, though. Overall, the Oppo performed better when watching movies and playing games, scoring slightly lower in the music use case. As a recording device, it performed equally well in all use cases, delivering a pleasant sonic signature, even at high sound pressure levels, such as at concerts and performances. The stereo recordings were also very engaging.

Trial summary

Learn about SBMARK audio tests: For scoring and analysis in our smartphone audio reviews, SBMARK engineers perform a series of objective tests and undertake more than 20 hours of perceptual evaluation under controlled laboratory conditions.
(For more details on our playback protocol, click here; for more details on our recording protocol, click here.)

The following section compiles the key elements of our extensive testing and analysis performed in the SBMARK laboratories. Detailed performance evaluations in the form of reports are available upon request. Do not hesitate to contact us.

How the audio playback score is composed

SBMARK engineers test playback through smartphone speakers, the performance of which is evaluated in our labs and under real-life conditions, using apps and preset settings.

In audio playback, the Oppo Find N2 Flip delivered decent tonal performance overall, although it lacked high-end and low-end extension. This also emphasized the somewhat dull treble sound and not particularly strong bass. While the rendering of the attack lacked sharpness, it still worked decently. Punch and Bass Precision were a bit underwhelming, but on the plus side, the secondary attributes of the Dynamics were pretty consistent across all volume levels.

The device’s built-in speakers produced a fairly large soundstage where individual sound sources were easy enough to pinpoint. Distance was accurately rendered but depending on the audio file being played the depth rendering could have been better at times. Our experts also found the minimum volume to be a little too low for highly dynamic content such as classical music, and objective measurements have shown a lack of consistency in volume distribution. Maximum volume was quite good, however, and the Oppo was virtually free of unwanted audio artifacts, with the exception of accidental occlusions from the built-in speakers, which can be common.

Hear about the playback performance of the smartphone tested in this comparison with some of its competitors:

Recordings of smartphones playing some of our songs at 60 LAeq in an anechoic environment via 2 microphones in AB configuration, at 30 cm

Here’s how the Oppo Find N2 Flip fares in playback use cases compared to its competitors:

Playback of use case scores

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

Frequency response of music reproduction

A 1/12-octave frequency response graph, which measures the loudness of each frequency emitted by your smartphone as it reproduces a pure sine wave in an anechoic environment.

The Dynamics Score measures the accuracy of changes in the energy level of sound sources, such as how accurately a bass note or impact sound of drums is played.

Secondary attributes for spatial testing include pinpointing the location of a specific sound, its positional balance, distance, and amplitude.

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

Here are some sound pressure levels (SPL) measured while playing our sample recordings of hip-hop and classical music at maximum volume:

hip-hop Classic
Oppo Find N2 Flip 75.3 dBA 72.2 dBA
Samsung Galaxy Z Flip4 73.6 dBA 68.4 dBA
Apple iPhone 14 74.8 dBA 71.9 dBA

The following graph shows the gradual changes in volume from minimum to maximum. We expect these changes to be consistent across the range, so that all volume steps match user expectations:

Music volume consistency

This line graph shows the relative loudness of the playback versus the user selected volume step, measured at several volume steps with correlated pink noise in an anechoic box recorded 0.20 meter on axis.

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

Playback Total Harmonic Distortion (maximum volume)

This graph shows total harmonic distortion and noise over the audible 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 40cm) at the device’s maximum volume.

How the score of the audio recording is composed

SBMARK engineers test recording by evaluating recorded files on reference audio equipment. These recordings are made in our laboratories and under real-life conditions, using apps and default settings.

The audio recordings of our tests highlighted the Oppo’s excellent tonal rendering, thanks to an exceptional tonal balance that characterized a bright and natural sound delivery with considerable warmth. The rich treble has been combined with a good midrange and natural bass rendition. Dynamic performance was good too, with a natural envelope and sharper attack than the Find N2.

The breadth of recording was excellent across all use cases, and even more immersive than the foldable Find N2. In addition, the distance rendering was very good and the excellent locateability made it easy to locate sound sources in the scene. The volume of the recording was quite high and the Oppo did a good job of controlling unwanted artifacts in common use cases. Our experts only noticed distortion and pumping when recording louder sounds, like screaming vocals. The background was clear and well rendered.

Here’s how the Oppo Find N2 Flip fares in recording use cases compared to its competitors:

Use case scoring

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

Video frequency response of life

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

The Dynamics Score measures the accuracy of changes in the energy level of sound sources, such as how accurately plosives in a voice (p, t, k, for example) are reproduced. The score also considers the signal-to-noise ratio (SNR), such as how loud the lead voice is compared to the background noise.

Secondary attributes for spatial testing include locating a specific sound’s location, positional balance, distance, and amplitude on recorded audio files.

Directness of registration

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

The loudness score represents how loud audio is normalized on recorded files and how well the device handles noisy environments, such as electronic concerts, while recording.

Here are the sound levels recorded in the audio and video files, measured in LUFS (Loudness Unit Full Scale); for reference, we expect volume levels to be above -24 LUFS for recorded content:

Encounter Videos life Selfie videos Memorandum
Oppo Find N2 Flip -24.9 LUFS -22.2 LUFS -19.1 LUFS -18.8 LUFS
Samsung Galaxy Z Flip4 -25.2 LUFS -21.5 LUFS -19.7 LUFS -21.6 LUFS
Apple iPhone 14 -23.8 LUFS -22.5 LUFS -20.5 LUFS -18.7 LUFS

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

In this audio comparison, you can hear how this smartphone handles wind noise compared to its competitors:

matrix(3) {
[“Oppo Find N2 Flip”]=> string(68) “resources/Oppo/FindN2FlipV2.1/OppoFindN2Flip_MicrophoneArtifacts.m4a”
[“Samsung Galaxy Z Flip4”]=> string(73) “resources/Oppo/FindN2FlipV2.1/SamsungGalaxyZFlip4_MicrophoneArtifacts.m4a”
[“Apple iPhone 14”]=> string(67) “resources/Oppo/FindN2FlipV2.1/AppleiPhone14_MicrophoneArtifacts.m4a” }

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

Background evaluates how smoothly various sounds around a voice blend into the video recording file. For example, when recording a speech at an event, the background shouldn’t interfere with the main vocal, but should provide context of your surroundings.

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Philip Owell

Professional blogger, here to bring you new and interesting content every time you visit our blog.