How we test MP3 players
Discover how we test MP3 players for sound quality, portability and ease of use to find our Best Buy models.
Whether you're looking for an MP3 player with great audio quality, one that can play videos or simply one that's easy to use, we test each device under various conditions so you don't have to.
We examine everything that matters, from how long the battery lasts when you're listening on the go, to how easily you can skip between tracks, regardless of brand or price. Our expert, independent reviews will help you pick an MP3 player that delivers top-notch audio, ideal for listening to your favourite podcast, jazz track or rock anthem.
Our MP3 player reviews answer the most crucial questions, including:
- What’s the sound quality like?
- How easy is it to use?
- How portable is it?
- What’s the battery life like?
- Should I buy it?
Using assessments conducted by our experts, we rate every MP3 player passing through our test lab, offering a comprehensive review that you can trust.
Take a look at the must-have models on our MP3 player reviews page.
What's the sound quality like?
During our testing, a panel of audio experts listen to an MP3 player through the supplied headphones and a pair of known high-quality headphones too. They carefully study the sound quality provided across a range of genres and speech, providing fantastic insight into the overall performance of each of the devices. We also check for sound leakage from the supplied headphones to understand how much, if any, noise escapes to bother people around you. This is known as the ‘tube test’.
How easy is it to use?
However good an MP3 player sounds, it's not going to be worth buying if it's difficult to use. MP3 players that score poorly in our ease-of-use tests tend to suffer from a common list of problems: poor displays, badly arranged keys and long upload and download times when transferring files from your PC to your device.
Our unique and rigorous tests weed out any hard-to-use MP3 players, so you won’t be left dealing with confusing instructions and counterintuitive menus, or wasting time waiting for files to transfer from one device to another.
How portable is it?
You’ll struggle to find an MP3 player larger than pocket-sized, but it's not just the dimensions that determine how portable a device is. We thoroughly test each MP3 player in our lab to ensure it's as comfortable to use on the train as it is during a morning run through the park. How effectively an MP3 player can be pinned to an item of clothing is also considered when picking out a Best Buy.
What’s the battery life like?
After we've charged and discharged an MP3 player's battery several times, we charge it fully, load the device with 20 tracks and set them to play continuously. By doing so, our experts can measure the length of playing time you get from the MP3 player.
We also take a close look at how long it takes to recharge every device we review. There's around a 46 hour difference in battery life between the best and worst MP3 players when playing music.
The Which? difference
We test MP3 players of all types, shapes and prices - from budget models to premium releases. Our MP3 player reviews cover popular choices from Sony's Walkman range, along with Apple's iPod Touch, Nano and Shuffle.
Nobody tests MP3 players as thoroughly as we do, and our experts are committed to putting each and every device in the test lab through its paces.
The score an MP3 player needs to earn to be considered a Which? Best Buy
Should I buy it?
The performance of an MP3 player in all aspects of our testing determines the overall score awarded. But as some elements are more important than others, they carry different weights. Below is a breakdown of what makes up our test score:
- 60% Sound
- 20% Ease of use
- 10% Performance
- 10% Features
An MP3 player has to achieve 70% or more to earn our Best Buy recommendation, and anything scoring below 40% is highlighted as a Don't Buy that we think you should avoid. Our How to buy the best MP3 player advice page has more tips on picking the model that's right for you.
Ready to buy a new MP3 player? Our MP3 player reviews page will help you pick the perfect model for you.