ifi audio iSilencer3.0
Does your USB audio system suffer from annoying background noise?

The iSilencer3.0 is for anyone who wants a simple way to reduce distortion and enjoy clearer, noise-free tunes.


Background noise can often haunt your enjoyment of your music or movies. At iFi, we ain’t afraid of no ghosts and came up with the iSilencer3.0 to rid your sound of these audio gremlins.

ifi audio iSilencer3.0

Plug. Play.

Simply plug the iSilencer3.0 directly into the USB port of your computer. Easy. You’ll notice you get the deeper detail in your music. Music will seem clearer, more transparent and bass will be improved.

The spooks are gone.

Double. Less trouble.

This device can be used not only at the active USB ports but also at unused USB ports too. It will reduce EMI.

Using multiple iSilencers (and therefore the inbuilt ANC circuit) will double the noise reduction each time the number of units is doubled.

Just don’t cross the streams.

ifi audio iSilencer3.0

Silence is golden

The iSilencer3.0 uses iFi’s improved Active Noise Cancellation+® tech to decrease noise by 100x the common noise filter. This is equivalent to 40dB. We use our REBalance® tech to get rid of clicks and distortion.

Enjoy the iSilencer3.0

This little gadget is a hassle free way to banish those frustrating and unnecessary ‘sound spooks’ that plague your music. As the song says, Enjoy the Silence. Long live Depeche Mode.

So, why USB3.0? USB3.0 allows for a greater amount of audio transfer due to the better wiring specification. It is still backwards compatible with USB2.0.

Enjoy the silence! Our Active Noise Cancellation II® (ANC II) tech means that measured noise drops by 100x or 40dB in comparison to the common noise filter.

Quiet! Active Noise Cancellation+® (ANC+) at work!

Exceptionally quiet power. The measured noise floor is 100x quieter than the common noise filter.

REBalance® literally rebalances the signal to address the common problem of clicks caused by jitter. This is a form of digital distortion that leads to data ‘packet’ errors and cold harsh sound.

Our technology re-balances the signal to ensure that the digital signal received by the DAC is identical to the original source, no matter which audio format is being played.


  • Super-Speed USB3.0 (and USB2.0 backwards compatible)
  • Connectors: USB3.0 gold-plated connectors
  • Dimensions: 48 (l) x 18 (w) x 8 mm (h)
  • Weight: 6.3g (0.22oz)
  • Warranty period: 12 months


This little beast works miracles

I have a USB out into a $100 dac which channels into an old receiver and a simple 2.1 speaker setup. The system is connected with properly shielded wires. Prior to this device, plugging the USB directly into my laptop resulted in a minimal (but annoying) electrical whine from the speakers, if they were playing music or not. Connecting through my docking stations USB took the whine to 11 – it was so loud and annoying that I could not work in the office unless I fully powered down my receiver, to say nothing of the poor music quality.

Enter, this little wonder beast. Now, connecting through my dock to minimize the number of USB cables connected to my laptop the electrical distortion is completely undetectable until my ear is 2 inches from the speakers. Of course that will never happen in practical usage.

My office is nearly silent until I hit “play” and the music emerges from nowhere. It makes that much of a difference. I have personally recommended this device to friends, and will likely pick up a few extras. I cannot imagine ever plugging in a USB speaker without it.

For those who claim that “digital is digital” and this is a scam that won’t make any difference, I will remind them that electricity runs through even “digital” wires and that audio equipment translates that into feedback. But my office is so quiet it is as if the equipment is turned off until that magical moment when the music arrives.

I could easily go on, but just buy this thing. It made more of a difference than any other piece of my audio setup.

(Click name to read original review)


iSilencer3.0 iDefender3.0
Primary useHomeHome
Who is it for? Generalist-for reduced USB port noiseSpecialist-for breaking Ground loops
Also inject clean 5v via additional iPOWER
(External power supply needed for iDef3.0 to break the Ground when USB-powered DAC is used. Not required if USB is internally-powered by DAC.)
USB standard (max)USB3.0 Super-speed 5GbpsUSB3.0 Super-speed 5Gbps
Active Noie CancellationYes-
Reduced jitter Yes-
IsoEarth (auto)-Yes
Inject 5v for clean power (iPOWER rec. )-Yes
Dimensions48 (l) x 18 (w) x 8 mm (h) 48 (l) x 18 (w) x 8 mm (h)
Weight6.3g (0.22 lbs)6.5g (0.23 lbs)

Reference to the 1984 film Ghostbusters. Four guys, a girl and ghosts. And proton guns that would destroy the world if you crossed the streams. Watch this.

EMI (Electromagnetic Interference)

EMI is a type of interference caused by errant and unwanted electromagnetic waves that are received and amplified by an audio system. They cause some of the annoying ‘audio gremlins’ we often talk about.

Active Noise Cancellation

Active Noise Cancellation (ANC) reduces unwanted sound by the addition of a second sound wave specifically designed to cancel out the first. This basically results in no sound at all as it reaches unwanted sound even at the lowest frequencies.

Passive noise cancellation is done by means of insulating filters and works best on the middle to high frequencies. It does not work on the lower frequencies meaning that some sound can still be heard.

Common Noise Filter

The common noise filter cuts out most noise gremlins found in typical audio systems such as RFI/EMI.