audio-sound @ hatena

An audio review & news blog. The volume should not exceed 80 dB is recommended. I usually adhere to the safe-listening style by WHO. Please note that my aural impressions and interpretations of measurements are also made from a safe-listening style.

(News) ACMEE MAGIC SOUND 4S: 192K dongle amplifier




ACMEE recently released the AK4493 version of its latest high-performance dongle amplifier, the ACMEE Magic Sound IV. This time, the original Magic Sound 4 has been brushed up and a low-cost entry-level model, the ACMEE MAGIC SOUND 4S, has been released.



  • Dark blue color, simple and pure.
  • Fully equipped with power supply
  • Audio pure land, channels symmetrical left and right
  • Balance support, amp assist



  • Model: Magic Sound 4S
  • Color: Blue
  • Body material: 6060 aluminum
  • Sampling rate/bit depth:192K/24Bit
  • Output level: single-ended 2Vrms/balanced 4Vrms
  • Mono output power
    • Single-ended: 250mW (16 ohm)/125mW (32 ohm)/26mW (150 ohm)
    • Balance: 270mW (16ohm)/500mW (32 ohm)/106mW (150ohm)/53mW (300ohm)
  • SNR: single-ended 110dB, balance 115dB
  • Frequency response: 15Hz-45kHz
  • DAC: ES9018K2M
  • Headphone amplifier: RT6863*2
  • Audio power supply: ±5.5V
  • DAC power supply:  Low noise LDO *3
  • Input: TYPE-C
  • Output: 3.5mm PO , 4.4mm balanced
  • Size: 60mm*24mm*11.5mm
  • Weight: 18.58g


Dark blue color Magic Sound 4S, simple and pure.

The Magic Sound 4S amp inherits the exquisite sandblasting workmanship and dark blue of the MF02S. The appearance design echoes and inherits the MF01 and MF02S. It adopts the same intaglio process of the side gully and the MF02S high-end version. It feels great. In terms of appearance, Magic Sound 4 uses a non-button, single indicator light, and seamless design. The appearance is extremely simple and generous, blue is dark, and hearing is pure.

Fully equipped with power supply, seven stars with the moon

The audio power supply of the Magic Sound 4S amp adopts ±5.5V boost and ±4.8V ultra-low noise LDO design, which effectively reduces power supply noise. The DAC left and right channel power supplies are separated, using two 3.3V LDO power supplies to improve the left and right channel separation . Plus the 3.3V power supply and 1.2V power supply for the digital circuit. Magic Sound 4 has 7 power chips in its petite body.


Audio pure land, channels symmetrical left and right

Magic Sound 4S uses the same independent PCB board design for audio circuits as MF02S, which is called pure land technology within the ACMEE team, which is to create an independent pure land for audio circuits and eliminate the interference of digital signals on audio circuits. In addition, in the audio circuit, a completely symmetrical design for the left and right channels is adopted, and the wiring length, wiring width, wiring path, and component layout are consistent to improve the consistency of the left and right channels.

Balance support, amp assist

Magic Sound 4S uses RT6863 high-sound quality and high-drive amp chip, and has both 3.5mm audio and 4.4mm balanced interfaces, which can satisfy most headphone drivers. Please refer to the specification for details.


Never perfect, never stop

ACMEE Audio has been surrounded by many customers and friends for 4 years. Thanks to the friends who have used ACMEE products and provided valuable opinions. ACMEE's works have never been flawless, and we need to hold a carving knife and carve together. ACMEE Audio will not work behind closed doors, and will explore everyone's acoustic understanding with friends.

Price & Availability

The ACMEE MAGIC SOUND 4S is available at Penon Audio and other retailers for $79.