Features
The e22 DAC is based on the ES9018 Sabre
32
reference DAC chip. It delivers 32-bit precision capable of
resolving the smallest signal details. The chip features patented 32-bit Hyperstream™ architecture and
Time Domain Jitter Eliminator. ES9018 delivers the industry’s highest performance levels that will
satisfy the most demanding audio enthusiasts.
Windows ASIO Driver Advantages
Using ASIO brings unique advantages that are hard to achieve and reliably verify with other Windows
driver technologies.
Automatic Sampling Rate Switching
PCM data is always streamed without re-sampling. Native Windows drivers often require manual
sampling rate selection and may apply implicit re-sampling when the source rate differs from the rate
set in the Windows Control Panel.
Automatic PCM / DSD Switching
Audio data is always streamed in its native format. e22 switches automatically between PCM and DSD
modes. DSD streams are processed in their native format without conversion to PCM.
Bit-perfect operation independent from the Windows volume control and mixer
The Windows volume control and mixer are optimized to provide wide compatibility and easiness of
use. These features come at the expense of sound quality. The resulting output is not bit-perfect or bit-
transparent. Third party proprietary Windows drivers are hard to be verified as bit-perfect because
factors beyond the control of the user can change the Windows sound processing chain.
Our proprietary ASIO implementation is completely independent from the Windows sound system and
always operates in Exclusive Mode. Only one player can take control of the ASIO driver. When playback
starts the player sets the driver sampling rate to be the same as the native rate of the current media file.
The sound data stream is delivered to the e22 FIFO memory buffer without any processing or
manipulation.
Asynchronous USB mode eliminates jitter caused by the PC or the USB interface
Asynchronous USB is a two-way communication method between a computer and an external USB
device. In this method, the USB device is running as a master, and the computer is acting as a slave that
delivers data only when requested by the master.
In the case of the e22 DAC, sound data is requested by the FPGA core and stored in the device FIFO
memory buffer. The FPGA core makes sure that the buffer never gets empty during playback. Data from
the buffer is streamed to the DAC chip. The precision of the timing of the output stream is determined
only by the DAC oscillators and it is not degraded in any way by the PC clocks or by delays caused by the
USB interface.
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