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SVS Subwoofer Port Bungs (Promotional item)

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The 20Hz mode delivers the strongest overall bass with extension to 17–18Hz. The 16Hz mode reaches 13–14Hz with slightly reduced output, while Sealed mode suits smaller rooms and can extend to 15Hz or lower. Variable tuning allows optimisation for different rooms and listening styles.

*Free when purchased with a qualifying SVS subwoofer.

Free Next Day Delivery*

Free next weekday delivery

When you spend over £75, we will send you a tracking number where DPD will give a one hour delivery window. Services available Monday to Friday (excluding public holidays) to most mainland UK addresses for in stock items ordered before our cut-off time at 3:30pm. Terms apply.

Free Saturday delivery

When you spend over £299. We will send you a tracking number where DPD will give a one hour delivery window. Services available to most mainland UK addresses for in stock items ordered before our cut-off time on Friday 3pm. Terms apply.

Free Sunday delivery

Free next-day delivery with DPD is available when you spend over £299. Orders must be placed before 3:30pm on Friday to qualify. You will receive a tracking number, and DPD will provide a one-hour delivery window on the day of delivery. This service is available to most mainland UK addresses for in-stock items ordered before our daily cut-off time. During peak holiday periods, cut off time is Saturday 2:00pm. Sunday delivery is available in selected locations. Terms and conditions apply.

Reserve for Collection

Some of our manufacturers request for their items not to be sold online. For these items please call to order 01925 828009

Remote locations

Standard next day delivery is free for all orders to most UK mainland addresses. All other delivery prices are determined by the destination, the service chosen and the value and weight of your order. Addresses in the Scottish Highlands, offshore, Northern Ireland & Ireland may incur additional delivery costs, depending on the items ordered.

Returns Policy

If for any reason you’re not completely satisfied with your purchase, we’re happy to offer a refund within 30 days, provided you inform us of your intention within 14 days of receiving your item and return it to us within the 30-day period.

For our full returns policy, click here.

The default 20Hz mode, with all ports open, delivers the most powerful overall bass performance and extends usable in-room response down to around 17–18Hz. Sealing one port and selecting the 16Hz tuning mode extends low-frequency output further to approximately 13–14Hz, with a slight reduction in maximum output at higher bass levels, making it ideal for deeper infrasonic effects in films and music.

In Sealed mode, with all ports closed, the subwoofer rolls off more gradually from around 32Hz, which can work exceptionally well in smaller rooms with strong room gain, often achieving extension down to 15Hz or lower. These variable tuning options allow the subwoofer to be optimised for different room sizes, listening preferences, and playback demands.

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