Allo's Revolution DAC is the result of an ambitious project: to offer a DAC capable of achieving consensus among both audiophiles who are adept at measurement and audiophiles who are adept at the listening experience.
Allo's Revolution DAC is the result of an ambitious project: to offer a DAC capable of achieving consensus both among audiophiles who are interested by measurement performance and among audiophiles who are interested by the listening experience performance.
To do this, the Allo technical team undertook a vast in-depth reflection on integration techniques promoting minimal distortion + noise (-114.5dB) and homogeneous over the entire audible spectrum while simultaneously conducting research focused on subjective appreciation in the listening experience. Revolution DAC technology and design revolves around a principle of maximizing THD performance (-123dB) where this factor is adressed independently of noise (N).
Review by The Hans Beekhuyzen Channel
DAC ES9038 Chip
At the heart of the Revolution DAC is an ES9038 DAC chip. This component is one of ESS flagship products and belongs to the best current hardware solutions for high-fidelity audio decoding, notably with the famous HYPERSTREAM 32 BIT architecture. This chip is also equipped with advanced reconstruction filters and has excellent finesse in dithering.
ESS technology is also very popular in that it allows extremely precise volume control that respects the digital signal.
The integration of the ES9038 chip within the Revolution DAC circuit was the subject of a specific development in order to cancel the "ESS bump" by passive filtering of high-frequency noise. This allows it to take advantage of all the qualities of ESS technology without creating listening fatigue.
The Revolution DAC is very easy to use thanks to its Micro-USB input. It can connect directly to any digital source with a USB-A output using its (supplied) data cable.
Dual clock and synchronization options
The digital circuit of the Revolution decoder uses its own duo of high-precision clocks NDK SDA.
In its in synchronous mode, the device is therefore capable of generating its own clock signal (ESS 128fs mode) in order to dispense the signal path from any DPLL (phase loop) processing and avoid as much as possible the apparition of digital noises.
In its asynchronous mode, the ESS circuit uses its algorithm of jitter reduction to the lowest setting for good stability and a very neutral effect.
Harmonic processing and oversampling filter options
By default the Revolution DAC is in a configuration favoring THD performance. However the device also offers a mode intended to underline second and third order harmonics in order to cover the expectations of audiophiles sensitive and favorable to the effects of euhponia. It is therefore possible to alternate between a mode optimizing measurable performance and a mode optimizing converging trends in subjective listening preferences.
The device also offers to completely bypass the oversampling filter to allow the user full control over the processing treatments applied to the digital signal. Please note, this functionality is not compatible with hardware volume control and makes it impossible to lower / raise volume as long as this filter is disabled.
Access to the options is facilitated by a display and a control panel located on the front. These allow you to configure and verify the correct configuration of the volume and all advanced parameters.
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