Louder than they look (Image: NXT)
THE tinny fizz produced by most laptops’ built-in speakers makes them far from ideal for listening to music. But plug-in speakers will soon be available that produce high-quality sound from portable PCs without the need for mains power.
The sound from existing computer-powered external speakers is often disappointing because the USB port, from which they get their power, can supply only 2.5 watts. Now the British firm of Cambourne, Cambridgeshire, has come up with a USB-powered system that can deliver up to 15 watts to each speaker.
The transistor circuits in audio amplifiers…
