Berkeley Audio Design发布最新Alpha DAC Reference

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因为用料组件较特殊，Berkeley Audio Desigh发布的最新款Alpha DAC参考系列花费了三年的时间才完成。采用陶瓷电路板并精心设计将电气噪音最小化并极大机械稳定性，使用多位元的D A转换芯片，因为可提供比1位元的D A芯片更好的表现。

Berkeley Audio Desigh 发布了新的Alpha DAC 参考系列。

因为用料组件较特殊，这款DAC花费了三年的时间才完成。采用陶瓷电路板并精心设计将电气噪音最小化并极大机械稳定性。参考系列的重量超过40磅，箱体使用固态坯料6061-T铝合金经过精密加工制成。

尽可能地重现DSD文件，如同市面上99%的DAC。 Alpha DAC使用多位元的D/A转换芯片，因为可提供比1位元的D/A芯片更好的表现。

Alpha DAC 参考系列支持32kHz到24bit的192kHz PCM文件从四个端子输入：平衡 AES、两组同轴 SPDIF和光纤。提供独立的单端平衡输出。

技术规格：

输入取样频率：32kHz~192kHz

输入取样位元：24bit

超低相位时钟精度在44.1kHz时，48kHz的，88.2，96kHz的，192kHz的采样频率176.4kHz和 ±100 ppm的

两路模拟立体声输出：XLR与RCA

数位输入：AES - XLR，110Ω; SPDIF1 - BNC，75Ω; SPDIF2 - BNC，75Ω; TOSLINK - Toslink光纤连接器

HDCD解码采样率16位元或44.1kHz的24位元

多个取样位元滤波器选项

XLR平衡模拟输出电平：+ 18dBu（6.15Vrms）最高，+ 12dBu（3.1Vrms）或更低的建议

RCA非平衡模拟输出电平：3.25Vrms最大的，2Vrms的或更低的建议

数字音量和平衡控制：0.1dB/步与0.05dB/步L / R增益调整，60dB范围  

在≥88.2采样率频率响应：±0.1dB从<0.1Hz到35千赫 - 3dB在59kHz和192kHz的采样频率为176.4kHz

Distortion at recommended levels: all products ≤-120dBFS

THD+N at maximum level:-110dBFS

固件可升级

尺寸（高宽深）：8.89cm*44.45cm*31.75cm

重量：30磅

原厂介绍：

Berkeley Audio Design is extremely pleased to announce the availability of the new Alpha DAC Reference Series.

The Alpha DAC Reference Series embodies everything we know about digital to analogue conversion taken to an unprecedented level – a level that requires new design concepts & new components at the edge of what is possible. The result is an immediacy and presence of music reproduction that is simply real.

We literally designed the Reference Series before is was possible to built it. Almost three years in development, the Alpha DAC Reference Series uses components designed to our specifications that were not commercially available. Several suppliers were not able to meet our requirements which delayed the release of the Reference Series by more than one year. But those obstacles were overcome and now the Alpha DAC Reference Series is a reality.

The presence & sonic reality of the Reference Series is the result of digital to analogue conversion at a new level of accuracy made possible by tremendous electrical & mechanical noise isolation coupled with extreme time domain stability. Ceramic circuit board materials are used in all critical areas and the enclosure is carefully engineered to minimize electrical noise while maximizing mechanical stability. The Reference Series weighs over 40 pounds and the entire enclosure is precision machined from a a solid billet of 6061 – T aluminum alloy.

A new high output, all metal IR remote control with direct input source selection is provided with the Reference Series.

Careful consideration was given to providing the highest possible reproduction of DSD files by the Alpha DAC Reference Series. 99% of modern DAC’s, including the Alpha Reference Series use mult-bit D/A converters because they provide better performance than 1-bit converters – even those who advertise “native” DSD compatibility. So, at some point, the 1-bit DSD stream must be converted to multi-bit for all of those DAC’s.

We could, like many other manufacturers, convert 1-bit DSD to multi-bit within the Alpha DAC Reference Series and show “DSD” in the front panel display. That would be the easiest approach from a marketing perspective. But that would also mean increasing the amount of processing in the DAC during playback which would degrade audio quality, and audio quality is the reason the Alpha Reference Series exists.

Fortunately, virtually all reproduction of DSD files using external DAC’s occurs with a computer based music server as the source. If the 1-bit DSD to multi-bit conversion is done first in the computer it can be performed with extremely high precision and superior filtering that preserves all of the content of the DSD file. Computer DSD to multi-bit conversion can be at least as good as that performed in a DAC and without adding processing noise near or in the D/A converter chip. Another advantage of computer based DSD to PCM conversion is that if higher performance DSD versions such as DSD 4x appear in the future they can easily be supported with a software upgrade.

For all of those reasons, DSD capability for the Alpha DAC Reference Series is provided by an included state of the art software application that provides either real time conversion of DSD 1x and DSD 2x to 176.4 kHz 24 bit PCM during playback or conversion to 176.4 kHz 24 bit AIFF or WAV files. The software application is included in the price of the Alpha DAC Reference Series and is compatible with either Windows OS or Mac OS based music servers.

The Alpha DAC Reference Series supports 32 kHz to 192 kHz 24-bit PCM through four input; Balanced AES, Coaxial SPDIF 1, Coaxial SPDIF 2 and Toslink Optical. Independent, single-ended and true balanced analogue outputs are provided. Dimensions are 17.5 inches Wide X 12.5 inches Deep X 3.5 inches High.