Our Verdict 
As forceful as it is articulate - not cheap, but ideal for big bass from a small box
For 
Formidable extension and ability from a surprisingly compact box
sounds as exciting with music as it does with films
Against 
A PV1 will sound cleaner at very high volumes
that's it
Reviewed on

Subwoofers tend to fall into two categories: on the one side, there are the bigger boxes that can move a lot of air but which aren't particularly living-room-friendly; and on the other, there's the smaller kit which is easy enough to hide behind your sofa but which, with a few exceptions, tends to sound as small as it looks.

B&W's ASW610XP is designed to offer the best of both worlds. A sibling of the company's acclaimed £400 design, the ASW610, the 'XP is small – just 32cm tall – but thanks to its ultra-stiff, long-throw 25cm drive unit and formidable 500w Class D power amp, it sounds genuinely massive.

As with all recent B&W subs, the 'XP is a sealed-box enclosure, its complex Kevlar/paper drive unit ensuring minimal deformation under even the most extreme duress: push the B&W very, very hard, and it'll maintain a stringent accuracy that few rivals can equal.

However, there are limits to what a conventional wooden subwoofer cabinet can achieve, even one as stiff as this.

The occasional murmur of protestFor all the brilliance of the drive unit and power amplification, we occasionally drew a murmur of protest from the ASW610XP's cabinet as it struggled to contain the massive physical forces thundering through its innards.

More after the break

Its sibling design, the B&W PV1, remains a cleaner, less coloured listen in this regard – but bear in mind, we are talking about comparisons with a notably more expensive sub, and also about listening conducted in a big listening room at volumes that your neighbours would find distinctly unfriendly.

Rein the volume in only a little, and you'll find the ASW610XP has all the real-world weight and authority most living rooms and listeners could ever wish for.

It's agile and expressive, too: the sound fairly teems with energy, blending cohesion and formidable extension in equal measure. You might question the price – £300 seems quite a premium over the essentially similar '610 – but otherwise, there's nothing to find fault with here.