Pioneer U-05-S
Pioneer U-05-S headphone amplifier with USB DAC and fully balanced circuit, for audiophiles wishing to customise their cabling.
Description
The Pioneer U-05-S is a headphone amplifier designed with a built-in USB digital-to-analogue converter. It is aimed at demanding listeners who wish to get the best out of their headphones beyond the capabilities of a simple headphone output on a conventional audio source.
Its connectivity accepts virtually any type of cabling, from a classic jack to 3- or 4-pin NEUTRIK connectors. This extensive compatibility allows the headphone cabling to be adapted and customised according to each user's connection preferences, without being limited to a single type of connector.
The circuit is fully balanced, a design intended to preserve sound quality regardless of the headphone cable used. The unit also offers advanced calibration options, allowing the sound rendering to be fine-tuned beyond standard settings.
This type of amplifier is aimed at audiophiles who already own quality headphones and wish to use them with a dedicated USB source, particularly those who use interchangeable or custom cables and are looking for refined listening thanks to the calibration options.
What to check before buying used
Check the condition of the various headphone and NEUTRIK sockets: oxidised pins or a poorly contacting jack result in crackling or a cut-out channel. Also test the calibration and volume dials, which can crackle when turned if the potentiometer is dirty, as well as the DAC's USB recognition with several sources. Finally, checking that the balanced circuit works correctly across the whole volume range helps rule out any imbalance between channels.
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