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SuperClamp Triple Pack

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Clamping spikes and surges

SuperClamps are plug-in devices designed to improve the sound of your Hi-Fi or Home Cinema by reducing the effects of mains voltage spikes. They're designed by us and offer a very simple way to upgrade your system.

SuperClamps consist of two components – one a fast, solid state device culled from aerospace applications and the other a varistor to absorb the spike energy. These two components are mounted into a mains plug which you simply plug into a power socket (one close to your Hi-Fi system is ideal). Nothing needs to be connected to the plug – they will work as long as the socket they are plugged into is switched on.

How many?

You can fit as many SuperClamps as you like. One customer kept adding them until he stopped hearing improvements - and he had over 15. The SuperClamps work particularly well plugged into unused sockets throughout the house and there's a saving to be had if ordering a triple pack.

The versions

SuperClamps are available mounted into a mains plug as on this page. They are also available mounted in a two-way 'cube' – the SuperCube – which is useful if you don't have a spare socket to connect a SuperClamp plug.

SuperClamps are also an optional upgrade on our PowerBar mains extensions and any power cable that is fitted with a WattGate plug. The components are fitted internally for optimum performance. To add a SuperClamp to any of these products, check the 'SuperClamp' box on the product page at the point of ordering and it will be included.

SuperClamps are also incorporated as standard in the Silencer and MiniPurifier power filters, and also into our XBlock mains extensions. If you have any of these products, you'll be benefitting from the SuperClamp.

Maintaining their effectiveness

SuperClamps wear out over time and become less effective: we recommend replacing SuperClamp components every five years. Any product with a SuperClamp can be returned to us for factory replacement of the parts at lower cost than buying a new one. To arrange this, Contact Us.

Money Back Guarantee

Don't forget! We are so confident in the performance of this product that it is covered by our 60 Day Home Trial with Money Back Guarantee. Buy the product and if you're not completely satisfied, you can return it within 2 months for a refund. For full details click here.


  • Voltage spike and surge 'clamp' offers effective spike reduction
  • Components mounted in UK 13A mains plug
  • Pack of three
  • What are spikes?

    A spike is a very brief over-voltage 'event' ranging from a few tens of volts above the highest legal peak voltage (360V for 230V), up to several thousand volts. They are typically under 1 millisecond in duration, are very common and often (though not always) the energy involved is small. Longer duration events are called surges and have the potential to do more damage, but mercifully these are less common.

    Spikes are caused by things such as lightning strikes, power outages, tripped circuit breakers, fluorescent lights, refrigerators and washing machines switching on and off. The quality and severity of spike activity varies during the day, and from day to day. Even with well-designed equipment, spikes or transients – if regular – can and will prematurely stress and wear out critical mains-connected parts and their insulation.

    In our opinion, high voltage spikes can also cause audible degradation of Hi-Fi sound by their effect on a Hi-Fi system's power supply and by raising the background noise level in amplification circuits. The spikes saturate the core of the mains transformer, preventing normal transformer operation during the period of each spike and causing distortion to the waveform. Mains spikes reduce the capacity of the power supply by 'strangling' the transformer operation producing subjective effects on an amplifier like softened bass and increased high frequency distortion.

    Customer Reviews
    Overall product rating 5 / 5
    5 / 5

    reviewed by anonymous
    28 Mar 2017
    Yes, I recommend this product.
    "Highly Recommended"
    Eliminates sibilance and settles the overall sound. Highly recommended.