This recommendation for the Audirect Beam 4 boils down to minimal suggestions with a focus on precision. When driving various portable earphones like dynamic drivers, electrostatics, and balanced armatures, the low gain already provides ample sound pressure for a pleasant listening experience. Despite trying numerous earphones, dynamics haven't posed any issues during my testing. However, with full-sized headphones using the 3.5mm single-ended output, they might sound slightly weak without switching to high gain. Take the Hidizs MS1 Athena, for instance, requiring transient impact and dynamic control support; switching to the 4.4mm balanced output resolves these concerns effortlessly.

The solid audio design of the Beam 4, featuring dual op-amps, independent grounding, and high-end components like femtosecond oscillators out of the three crystal oscillators, sets a high standard. Supporting MQA, DSD512, and other audio sources, alongside the premium ESS9281AC PRO flagship chip, the Beam 4's architecture is meticulously built for top-tier sound performance.

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