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Fit our best spike clamps

MegaCubes are are two-way power adaptors incorporating our MegaClamp components.

MegaClamps use components culled from the communications industry which are more effective at absorbing mains spike activity than anything we have tested before. The MegaClamp component is mounted into a convenient two-way cube and is useful if you have run out of power sockets in your Hi-Fi system's mains extension. The MegaCube allows you to add an extra socket whilst helping to reduce the effects of voltage spikes and surges.

There's more information on MegaClamps on the MegaClamp product page here.

It doesn't need to be replaced

Unlike the SuperClamp which wears out and becomes less effective over time, the MegaClamp is many times more effective than the SuperClamp and has the advantage of not needing to be replaced every five years. As with all of our clamping products, we recommend that you unplug your Hi-Fi or Home Cinema equipment in the event of a storm - nothing will protect your equipment in the event of a direct lightning strike.

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 2-way adaptor
  • 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 vic Brash
    13 Apr 2016
    Yes, I recommend this product.
    I have used one of these fitted to a Russ Andrews main socket to power my R.A. 3000 Balanced Mains via a Powekord mains feeder cable. Also it powers an independent R.A Clarity -8TM Enhancer as well. Good solution to stabilizing my home cinema system