Product details

IM4 IEM Accessories include 4.4mm balanced cable, 3.5mm cable with microphone, and D2 DAC.

High-purity wire, low signal loss, enhance sound quality—clear treble, full bass, wide sound field.

Gold-plated plug, anti-oxidation, stable transmission; soft wire, anti-tangle, comfortable to use.

Plug and play, no modification needed. Suitable for daily commute, Hi-Fi listening, calls, games.

Specs: Fit IM4 IEM, 4.4mm balanced + 3.5mm with mic + D2 USB-C to 3.5mm DAC.

FAQs

Please read our FAQs page to find out more.

How to: Choose the right banana plug?
  • Closed Screw Type. All Fosi amplifiers use standard-sized speaker terminals (4mm pins).
  • Easy to wire up and solidly connect to amplifier and passive speaker.
  • If they do not fit, use a little force to tighten the plugs.
  • Fosi Audio Banana Plugs (Copper, Silver/Gold Plated): http://bit.ly/40Djq0U, https://bit.ly/3MkPL8t
  • Please watch tutorial videos: https://youtu.be/6pYhoqDlvNw / https://youtu.be/RGvBgGAwS9k
How to Diagnose Power Supply Failure?
  • The following situations may cause this issue
  • Case 1: The LED on the power supply does not light up; Case 2: Amp/Preamp does not turn on; Case 3: When plugged into the Amp, both light on the amp & power supply start blinking; Case 4: Amp/Preamp make noise; Case 5: Sound shuts off by itself
  • Possible solution
  • Check if the power supply is illuminated when plugged into AC by itself.

    Plug power supply into a different socket.

    Test the adapter with a meter.

    Try a different power supply (within a range of DC input).

    Test the included power supply on other electrical equipment.

    Please watch the tutorial video by clicking on the link provided. https://youtu.be/yCjygS03zTE
What is a GaN?
  • The GaN supply has a power output of 240W.
  • Offers overload and over-temperature protection.
  • The 48V 5A GaN power supply is also available on Amazon.

Didn’t find your answer?

Don't hestitate to contact us

  • 5 stars: 8 (100%)
  • 4 stars: 0 (0%)
  • 3 stars: 0 (0%)
  • 2 stars: 0 (0%)
  • 1 star: 0 (0%)
A
Andrew (Canada)

Im not someone who writes reviews, but in this case I'm going to suggest this combination is a winner.
This iem dac combination is by far my top sounding, favourite pair, of iem's I own, and I own many! Also I have made many purchases from fosi audio and i have never had issues, I recommend.

D
DocHouse (Germany)
Awesome stuff

Great listening

A
Andrew (Canada)

Im not someone who writes reviews, but in this case I'm going to suggest this combination is a winner.
This iem dac combination is by far my top sounding, favourite pair, of iem's I own, and I own many! Also I have made many purchases from fosi audio and i have never had issues, I recommend.

D
DocHouse (Germany)
Awesome stuff

Great listening

R
Ruslan (Ukraine)
Fosi Audio IM4 , + 4,4 mm Balanced

In the budget segment, this is the best solution right now. If you're unsure which headphones to buy, get these and you'll know where to go from there. With the stock cable, they sound full-bodied, with some emphasis on the low frequencies. I also bought an additional cable, and the sound became more "mature," with more structure to the low frequencies. The signature didn't change much, which is good. Fosi pleasantly surprised me.

R
Ruslan (Ukraine)
Fosi Audio IM4 , + 4,4 mm Balanced

In the budget segment, this is the best solution right now. If you're unsure which headphones to buy, get these and you'll know where to go from there. With the stock cable, they sound full-bodied, with some emphasis on the low frequencies. I also bought an additional cable, and the sound became more "mature," with more structure to the low frequencies. The signature didn't change much, which is good. Fosi pleasantly surprised me.

G
Gerry (United States)
Great upgrade

I’m a Fosi fanboy, so naturally I had to get this for my Fosi md3 , and it really makes a huge difference in the sound; it’s much quieter and cleaner with no noise. Also, kudos to the non tangled cable. It’s $36 , and well worth it.

G
Gerry (United States)
Great upgrade

I��m a Fosi fanboy, so naturally I had to get this for my Fosi md3 , and it really makes a huge difference in the sound; it��s much quieter and cleaner with no noise. Also, kudos to the non tangled cable. It��s $36 , and well worth it.

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