In the speaker test, the best Bluetooth and WiFi devices score highly with their rich sound and ease of use. However, only a few offer this complete package. Natural sounding bass, clearly audible details and balanced, lively sound - this is what the perfect speaker should sound like...

Sony's Ult Field 7 boombox delivers plenty of power with clear sound and rich bass - but at 450 euros it's no bargain.

The best of the three ULT sound age natives in relation to the price.

With the ULT Field 7, Sony has not created the ULTimative Bluetooth speaker, but it is undoubtedly a very good one. The speaker does a lot right, especially in terms of sound, and scores with a detailed, high-resolution and pleasantly airy sound. The robust workmanship, the waterproof design and the long battery life of around 30 hours also speak in favour of this model, which is still reasonably portable...