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Guardian-86

Availability:
5+ in stock, ready to be shipped
Original price $0
Original price $99 - Original price $99
Original price
Current price $99
$99 - $99
Current price $99

The Guardian-86 is a high-end protection circuit designed to protect speakers against two common ways that power amplifiers can misbehave:

  • Sharp voltage transients on power-up and power-down, resulting in annoying clicks and pops in the speakers.
  • Excessive DC voltage on the output of the amplifier, for example resulting from amplifier failure or from unruly signal sources.

The Guardian-86 is suitable for use both with single-ended output and bridged/BTL output amplifiers.

Technical Documentation

  • The Guardian-86 is powered by the same power supply as the power amplifier. It will operate on any supply voltage in the range of +12 V to +90 V, thus, will work well with any amplifier powered by ±12 – ±90 V. This wide power supply range is supported without the need for modifications or adjustments. The Guardian-86 is literally plug-n-play.

    The Guardian-86 will enable the speaker connections five seconds after the power has been applied. This eliminates clicks and pops on start-up.

    During normal operation, the Guardian-86 continuously monitors the power supply voltage to determine the nominal supply voltage. The Guardian-86 will disable the speaker connections when the supply voltage drops below approximately 2/3 (67 %) of the nominal voltage, thereby minimizing thumps on power-down. 

    The Guardian-86 will disconnect the speaker if the amplifier outputs more than ±1 V DC, thereby protecting your speakers in the event of catastrophic amplifier failure. This DC voltage threshold was chosen following a thorough analysis of the reaction time, complexity, and reliability of the protection circuit along with an analysis of the failure modes of audio power amplifiers. 

    All this is accomplished without adding any measurable distortion. The Guardian-86 provides consistent, state-of-the-art performance through all of its service life.

    The Guardian-86 circuit module is designed, manufactured, and assembled in Canada.

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