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  1. #1

    Introducing SilentPower from iFi - DC Blocker & GND Defender

    DC Blocker

    Your humming transformer is your quarterback.
    Got mechanical hum. Deploy the DC Blocker.

    Goodbye mechanical hum

    Many amplifiers have a really annoying mechanical transformer hum (emitted from the transformer itself), especially those with toroidal (circular) transformers.

    You can hear it when you place your ear close or next to the chassis.

    This is usually caused by a small amount of DC voltage in the mains which makes its way through to the mains transformer, it will become ‘saturated’ and start to hum like a trooper.

    The DC Blocker is a clever device that you place at the IEC (at the rear power inlet) and as its name implies, it stops DC from getting into the audio mains. It eliminates transformer hum from amplifiers.

    GND Defender

    GND control.
    Take out speaker hum.

    AI ground detection

    With a GND Defender at the IEC power input, it will intelligently detect and remove the ground loop at the component.

    Behind this, the GND Defender:
    • Intelligently breaks DC ground loops to eliminate ground loop hum
    • EMI shielding is retained
    • Equipment Safety is unaffected (not a ground lift – so maintains equipment safety ground)

    If multiple ground loops exist, more than one GND Defender may be required.

    The GND Defender is smarter than the average ground lift. By a long way.
    Our ZEN DAC V2 is HERE!

  2. #2
    Senior Member
    Join Date
    Aug 2017
    Iowa City, IA

    Re: Introducing SilentPower from iFi - DC Blocker & GND Defender

    I recently purchased the GND Defender as I had a very slight buzz in my system that I assumed was caused by voltage differential between the amp dedicated circuit and the front end dedicated circuit. I tested with a cheater plug to confirm the issue, then purchased the GND Defender. It works as advertised. Eliminated the buzz with no sonic degradation. If you’ve got any nagging ground loop issues and don’t want to compromise safety, this might be the ticket.

    SPEAKERS KEF Blade 2 w/IsoAcoustics Gaia II | SUBWOOFERS Four DIY Speaker Hardware 12" passive subs driven by Dayton SA1000 amp | AMPLIFICATION Pass Labs X350.8, Cary SLP-05 w/Ultimate Upgrade | DIGITAL Marantz SA-10, Sonore opticalModule and opticalRendu, NUC8i7BEH Roon Core | VINYL EAT C-Sharp, Hana SL, EAT E-Glo S w/LPS, Bob's Devices Sky 20 SUT | POWER AudioQuest Niagara 5000, two dedicated circuits | WIRES AudioQuest William Tell, Earth, Leopard, Tornado | RESONANCE/ISOLATION Nordost Sort Kones, various Herbie's Audio Lab

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Introducing SilentPower from iFi - DC Blocker & GND Defender

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