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Bowers & Wilkins BB-ISW4 Back Box for ISW-4

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Bowers & Wilkins BB-ISW4 Back Box for ISW-4

The backbox is designed to increase the sound insulation to adjoining rooms, while also providing the fire safety barrier sometimes required by building regulations in order to prevent fires in the wall cavity from spreading into the room. Specifically designed for use with ISW-4 in-wall subwoofer. 

When used in solid construction, the back box will define an appropriate working volume for the speaker which may need to extend beyond the boundaries of the wall frame. 

Please read before purchase: Backboxes are priced as a single unit, please adjust the quantity accordingly. These are not retained in stock as standard and are a special-order item. For this reason, backboxes of any kind are non-returnable, so please ensure that your measurements (including that of the inside wall-space, beams, etc) are correct before ordering. Please consult your builder or contractor before purchasing, and ensure that the dimensions specified are suitable for the loudspeaker application.  

Who are Bowers and Wilkins?

Bowers & Wilkins is not a new name for hifi. They're a British brand, famous worldwide for producing some of the most astonishingly accurate sound speaker systems in the world. Their catalogue of innovative and unique products range from industry-leading iPod docks and wireless speakers like the Zeppelin Air and the A7, price-accessible home audio speaker systems like the 600 S2 and CM S2 series - all the way to reference level, high fidelity studio-used 800 Diamond series (as found in Abbey Road Studios).


Providing your item is in stock, the order is usually dispatched within 24 hours. Postage and packing is completely free for orders over £100*. Out of stock items will be dispatched as soon as they become available, out of stock items can take between 4 to 21 days for dispatch.


Orders are sent via our couriers' DPD on a next-day-delivery service and usually, take between 1 and 3 days. 


Please use this link to find more detailed delivery information.


*We ship free of charge to mainland UK addresses, excluding the Scottish Highlands or 'Out-Of-Reach' Scottish locations. Please consult the post-codes below to see if your location falls within this category. If you are still unsure, please contact us on 01432 354921. We also ship to Northern Ireland, Channel Islands, Scilly Isles, Scottish Isles and Scottish Highlands, however, delivery to these locations will incur a charge and can only be sent via a 2-day service.