ACS Select ATOM 4 Digital Analog Convertion and Playback System (DAC)

The ATOM 4 DAC (Digital-to-Analog Converter) redefines what mobile music can sound like.

Equipped with dual independent operational amplifiers and offering both 4.4 mm balanced and 3.5 mm unbalanced outputs, it delivers a significant boost in clarity, dynamics, and resolution across your entire music library.

Connect your ACS JANUS earphones with the 4.4 mm cable, plug the ATOM 4 into your phone, and you’ll be amazed by the home-audio-grade listening experience. 

The sound is powerful and detailed, with a wide, natural soundstage — it feels as if the singer is performing right in front of you.

ATOM 4 supports a wide range of sample rates and features an automatic indicator light that displays the current signal level.

Once you’ve heard it, there’s no going back！
Your true-wireless earphones?
From now on, they’re just for phone calls！

If you value ultimate sound quality, the combination of the ACS-selected ATOM 4 DAC with any ACS custom or universal in-ear monitor, paired through a 4.4 mm balanced cable, is the perfect setup to experience your music at its full potential.

Wired vs. Wireless — A Clear Difference
In short, if you don’t mind trading sound quality for convenience, wireless earphones are fine.
However, if you want to experience the authentic professional-grade sound that ACS earphones are designed to deliver, the ATOM 4 with a 4.4 mm balanced connection is the only choice.