Subwoofers

The DB3D is the smallest in B&W's premium DB series of subwoofers. It's neat, compact and – with its near-£2,000 price tag – not in any way entry-level. And despite its dimensions, of a roughly 12in cube sitting atop a 2in aluminium-trimmed plinth, it weighs a monstrous 25kg, courtesy of the enormous magnets for its two 8in drivers and a super-heavyweight MDF cabinet. In mass density alone, the DB3D ought to have its own gravitational field.

Commemorating 25 years of REL sub-bass systems in some style, the company's No.25 is a very special subwoofer and mad as a box of frogs. A really, really big box of frogs, too. Weighing in at a whopping 76kg, its width is close to 75cm, it's over 80cm deep including connectors poking out and it stands 54cm tall. And even if you have a large room to house it, you'll need a big wallet as well. The price? A cool £6,500.