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It's a lot to pay for a subwoofer that can't be used with non-Sonos hardware. If you can swing the cost, though, you'll get a tremendous boost to sound quality that integrates smoothly with a full Sonos network.

If you can afford it and you're already invested in Sonos, then yes ... If you're not rich, buy the Connect:Amp and hook it up to a good set of speakers. But you should probably buy Sonos, because it makes you listen to more music—which is the highest compliment you can pay a piece of music gear.

All told, this is an impressive piece of hardware. Audiophile it isn’t, but in terms of convenience, sound field, and fidelity you could do much worse.

What makes the Sub attractive is its relationship with other Sonos components ... Therefore, if you own a couple of Play:3s or Play:5s and feel like the music coming from them lacks range and definition, adding a Sub could improve the sound greatly

Yes, the price is very high. And yes, you can buy a subwoofer as good as this one for far less than $700. But you’re not paying the premium to get superior audio quality, you’re shelling out for the Sonos experience.

The bottom line: The Sonos Sub provides an instant upgrade to your Sonos Play speaker system, but it's quite pricey.

Sonos's SUB provides a very welcome low-frequency kick for the already-impressive Play:5 wireless speakers, and the effect would be more pronounced with the smaller Play:3. Seamless integration with an existing Sonos system makes it a very easy upgrade.

This isn't for everyone, something even Sonos admits, but for those that are intrigued to pay double what you would a regular sub-woofer you won't be disappointed.

A fantastic-sounding sub for people already with Sonos gear that are looking for better overall sound. You will need plenty of disposable cash to make it worth your while, but if you fancy treating yourself this month your ears will thank you.

If you’re willing to pay $699 for a component in your hi-fi speaker arrangement, you certainly wont be disappointed in the SUB.

If you love deep, bass-filled music, already have a Sonos system you are happy with, and have discretionary money then the SUB may be a good purchase.

On one hand you've got a mouth-wateringly expensive accessory for an already pricey range of products. On the other, you've got a truly brilliant piece of audio engineering that will transform turn your living room into a super club. If you can afford it, buy it.

There's a lot of clever technology inside and it's incredibly simple to configure, but £599 for a subwoofer is a lot of money ... Still, if you want a rounder, warmer and more balanced performance from your Sonos system, there's no doubting the quality of the SUB.