The Audirect Beam 4 is a pretty esthetic looking portable USB/DAC Amplifier that offers a natural and balanced sound profile, which has some remarkable features such like dual headphone outputs, hardware control button and a built-in microphone. Moreover, the device is equipped with a Self-Developed Battery Compensation & Power Management Control System and supports high-resolution audio formats, including Apple lossless and MQA, which makes it to a good DAC/Amplifier option with some minor flaws.

The Audirect Beam 4 has a pretty neutral sound signature that offers a fairly balanced bass, treble and midrange presentation. The bass is produced with a good level of depth and fullness, while the midrange shows an above average level of clarity, along with a tonality is mildly warm. The treble range on the other hand has a fairly natural sense of presence and a good grade of extension.

The Audirect Beam 4 review has been written after a burn-in period of about 60 hours. My sound experiences below are based on my auditions with IEM’s like Moondrop Blessing3, Whizzer HE10, FiiO FA7S and headphone like the Moondrop Void over the 3.5mm Single Ended output, which offers a relative similar performance with the 4.4mm Balanced output.

The lower frequency region of the region of the Audirect Beam offers a fast and controlled response, with good level of attack and sufficient sense of intensity when I do listen to percussions like cross or snare drums. The subbass area of the Beam 4 reaches pretty low and show in general a decent grade of rumble with all earphones and headphones I have listen to the device. The midbass area is fairly pronounced, clean and textured when I do listen to instruments from cross drums up to trumpets paired with the Moondrop Belessing3. The general tonality is mildly warm and soft, while it doesn’t make the general presentation dull or veiled.

The midrange of the Audirect Beam 4 has a tad warmer than neutral tonality. The general presentation of this area is relative smooth, while the sense of transparency and airiness is pretty good. The lower midrange shows a good amount of depth and body, with an adequate sense of fullness, which is an advantage while listen to male vocals and instruments like violas and cellos. The upper midrange on the other hand is pretty pronounced yet controlled, so that female vocals like Sertap Erener, Edith Piaf and Adel do sound quite musical and lively, especially when paired with the FiiO FA7S.

The Audirect Beam 4 shows a treble profile that is well-controlled, relative uncolored and fairly detailed. The lower treble has a good sense of presence and adequate level of clarity and definition when I do listen to string instruments and pianos or to soprano voices such like Sertap Erener and Hayley Westenra. The upper treble range of the Beam 4 is in general pretty controlled and is able to produce a good amount of air and sparkle. All in all, the treble range of the Beam 4 can be described as detailed and resolving. 

The Audirect Beam 4 is a quite successful portable USB DAC/AMP in terms of separation of instruments and vocals, when you pair it with IEM’s like the Moondrop Blessing3 or the FiiO FA7S. The soundstage of the device has a pretty spacious atmosphere with decent sense of depth and wideness.

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