iFi Audio SilentPower DC Blocker

• You can hear it when you place your ear close or next to the chassis.
  
• This is 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 amplifier. It therefore eliminates amplifier transformer hum.
• Optical Galvanic Isolation
• The DC Blocker removes such DC and eliminates such mechanical transformer hum, makes the transformer operate at the optimum environment. With the DC Blocker, there is 0 DC pass through.
  
• EMI Shielding
  EMI shielding is retained.
  
  
• Signal Regeneration​
  High-performance glass passivated semiconductor. High-case dielectric strength of 1500VRMS. UL listed. Flame resistant IEC socket/connecter/chassis (Fireproof polymers UL94-V0).
  
• Cute. Clever.
• All the benefits of cutting out annoying hum with no drawbacks. Intelligently stops any DC voltage from the mains to eliminate transformer hum. EMI shielding is retained and Equipment safety is unaffected
  
• Behind every good component is a DC Blocker.
  The bigger the amplifier, usually, the larger the toroidal which is susceptible to residual DC voltage. Just add the DC Blocker at the IEC to stop DC from getting in.
  
• 90-240V
  Maximum rating >7A, continuous current rating 4A
  Small size, universal application, won’t block any other connectors, sockets, or cables
• How do I use?
  
  DC Blocker
  
• Plug the DC Blocker into the back of your amplifier to stop DC from the mains causing transformer hum, in addition to retaining EMI shielding at the power source

• ZERO DC Block technology
  Blocks incoming DC – up to 1,200mV
  
  Voltage rating
  90 – 240 volts
  
  Maximum current rating
  > 7A
  
  Max amplifier power​
  880W or VA on 220v
  440W or VA on 110v
  
  Continuous current rating
  4A
  
  Universal IEC
  Hospital-grade IEC connectors
  
  Dimensions
  68 x 37 x 32 mm / 2.7” x 1.5” x 1.3”
  
  Weight
  63g / 2.2oz

Click here to download documentation from the manufacturer