To use HearID ANC, you must first create a personalized HearID ANC profile by completing the test in the app. During the test you should be in a quiet environment and the earbuds should remain in your ears. Avoid speaking, swallowing, chewing, or other movements while taking the test. If you change to a different size of ear tips or ear wings, you need to take the test again to update your profile. They automatically pause the music when one earbud is removed and start again once it is reinserted.

A couple of minor issues aside, the Liberty 4 are a roaring success, pairing excellent sound with a great range of features and customisation options. Spatial audio is closer to the 1MORE Aerothan premium offerings from Sony and Apple in terms of its efficacy, but certainly adds enough immersion to films and breadth to songs to justify its inclusion.The HearID feature in the Soundcore app creates a personalised sound profile after conducting a short hearing test.

The good news is that while this is the default sound, it's not the only one. The Soundcore app serves up customization in a couple of different ways, the more interesting being its "HearID" feature. This plays a series of beeps to test how well you can hear different frequencies at various volumes and uses the results to craft a sound profile that's specific to you. The earbuds fit well and make a good seal in my ear, which helps sound quality and noise-cancelling. Photograph: Samuel Gibbs/The Guardian Still, the noise-cancelling works better than I expected it to. They match the effectiveness of Samsung’s Galaxy Buds Pro but fall short of the best, such as Jabra’s Elite 85t and the AirPods Pro, which is still impressive for the price. The connection was solid to an iPhone 12 Pro and Galaxy S21 Ultra but I could not test them in a congested area because of the Covid-19 restrictions in the UK. Fusion Comfort Fit: Liberty 3 Pro’s earbuds have a triple-point ergonomic shape and built-in ear pressure relief for all-day comfort. 4 sizes of liquid silicone ear tips and flexible ear wings ensure you get a strong seal and secure grip.

The Anker Soundcore Liberty 4 are exceptionally well rounded, with effective ANC, solid spatial audio and even a built-in heart-rate monitor

Personalized Noise Cancelling: Standard noise cancelling only adjusts noise based on data. HearID ANC analyzes your ears and level of in-ear pressure to create a tailored profile that optimizes noise reduction and reduces external sound to suit your ears. The Soundcore app for Android or iPhone takes care of updates, settings, sound and noise-cancelling modes. The Air 2 Pro are standard Bluetooth 5 earbuds and support the universal SBC and AAC audio standards used by most devices. Each earbud can be used on its own but they do not support seamless switching, meaning you have to manually disconnect them from one device to connect to another. Rave / Rave Mini / Mega / Trance / Wakey / Icon+ / Motion X600 / Motion+ / Infini Pro / Model Zero / Model Zero+ / Liberty 2 Pro / Liberty Air 2 / Liberty 2 / Life NC / PowerConf / Flare 2 / Rave Neo / Rave Partycast / Trance Go / soundcore Mini 3 / Motion Boom / soundcore 3 / Boost(Upgraded) / Life Q30 / Life Q20+ / Life Q35 / Life Tune / Life Tune Pro / / Life Tune XR / Life A2 NC / Life Dot 2 NC / Life Dot 2S / Liberty Air 2 Pro / Life P3 / Liberty Neo 2 / Liberty 3 Pro / Rave+ / Select 2 / Life Dot 2 XR / Rave Neo SE / Life Tune Pro / soundcore min 3 Pro / Life P3 / Life Note 3 / Life Note 3S / Life 2 Neo / Life Q10i / Life Dot 3i / soundcore Dot 3i / Life Note 3i / soundcore Note 3i / Sport X10 / Life A3i / soundcore A3i / Life P3i / soundcore P3i / Space A40 / Space Q45 / VR P10 / Sleep A10 / Liberty 4 / A20i / A25i / P20i / P25i / R50i , etc. They sound pretty good with most music genres but excel with dance and electronica, full of energy and deep bass. There is a full equaliser accessible in the Soundcore app, as well as a set of sound pre-sets, including the default “signature” sound and the classic “bass boost” if you really need more bass.

Liberty 3 Pro's earbuds have an IPX4 water-resistant rating. The charging case is not water-resistant. The Soundcore Liberty Air 2 Pro offer much of what makes some of the best true wireless earbuds great but at a marked-down price. What was surprising was how powerful their bass performance can be. Listening to the Childish Gambino album ‘Awaken, My Love!’, we were surprised at how strongly the sub bass elements came across (even if they did sound a bit flabby). They certainly won’t bother audiophile grade alternatives, but for no-fuss day-to-day commuting use, they could be a perfect travel companion. Pros: solid noise-cancelling, good sound, good value, solid battery, comfortable fit, lots of tips included, good app, Bluetooth 5, either bud can be used independently, AAC support. The Soundcore Liberty Air 2 Pro make for a respectable voice-calling tool. The friend I called reported lower overall clarity than if I were speaking directly into my phone, but I was still coming through strongly and at least sufficiently clearly.The earbuds are touch sensitive on the outside. Tapping the ‘d’ at the top of the stalk activates the controls. Photograph: Samuel Gibbs/The Guardian Anker estimates battery life to be roughly seven hours per charge, with 21 extra hours in the cas. These are solid numbers for true wireless in-ears, but your results will vary with your volume levels. Powerful Audio and Noise Cancellation ACAA 2.0: Our exclusive coaxial dual driver technology delivers high and low frequency sound directly to your ear without interference. Its wide soundstage is detailed and spacious, bass has a deep punch, mids are luscious, and treble sparkles.