The workmanship of the case and earplugs is high quality, the noise-cancelling is effective and the operation is simple, but the large PerL Pro are less comfortable to wear. The best thing, however, is the great sound customisation, which gets an excellent sound out of the in-ears. The battery is just as first-class.

With the Sony WF-1000XM5, the best all-rounder takes the test winner crown. The in-ears combine very good sound with strong ANC and many practical functions. The Liberty 4 NC from Sound- core proves that cheap doesn't mean bad, holding its own in a strong test field and deservedly winning the price-performance award.

If it weren't for the Denon logo, you might think you were looking at a pair of Nuratrue from Australian manufacturer Nura. In fact, Nura was taken over by Denon and now offers its in-ears under its own name. The special feature of the Perl Pro 575 is their automated sound customisation...

Great-sounding, large in-ear headphones. Exciting auto-calibration of the equaliser, good fit with silicone wings on the back.

The Denon PerL Pro costs quite a lot of money, even if you take the more favourable market prices as a basis. You have to shell out around 300 euros - but in return you get a full load of high-tech. From an app-based test of the fit of the earpieces to a sophisticated acoustic adaptation to the wearer's hearing to various DSP functions for optimising bass reproduction and spatiality, everything is...

Great-sounding, large in-ear headphones. Exciting auto-calibration of the equaliser, good fit with silicone wings on the back.