Benchmark DAC1 HDR Manual de Instruções descarregar pdf (Página 28)

DAC2 Series Instruction Manual Rev C Page 28

The USB subsystem remains active when the

DAC2 is powered down. This prevents

interruptions to the computer playback

operations and eliminates the need to

reconfigure the computer every time the

converter is turned on.

Jitter-Immune UltraLock2™

UltraLock2™ is an improved version of the

UltraLock™ system used in the DAC1

product family. DSP processing is 32-bits,

DSP headroom is 3.5 dB, sample rate is 211

kHz, and jitter-induced distortion and noise is

at least 160 dB below the level of the music -

well below the threshold of hearing.

Benchmark's UltraLock2™ system eliminates

all audible jitter artifacts.

High Head-Room DSP

All of the digital processing in the DAC2 is

designed to handle signals as high as +3.5

dBFS. Most digital systems clip signals that

exceed 0 dBFS. The 0 dBFS limitation seems

reasonable, as 0 dBFS is the highest

sinusoidal signal level that can be represented

in a digital system. However, a detailed

investigation of the mathematics of PCM

digital systems will reveal that inter-sample

peaks may reach levels slightly higher than

+3 dBFS while individual samples never

exceed 0 dBFS. These inter-sample peaks

are common in commercial releases, and are

of no consequence in a PCM system until they

reach an interpolation process. But, for a

variety of reasons, virtually all audio D/A

converters use an interpolation process. The

interpolation process is absolutely necessary

to achieve 24-bit state-of-the art conversion

performance. Unfortunately, inter-sample

overs cause clipping in most interpolators.

This clipping produces distortion products that

are non-harmonic and non-musical. We

believe these broadband distortion products

often add a harshness or false high-frequency

sparkle to digital reproduction. The DAC2

avoids these problems by maintaining at least

3.5 dB of headroom in the entire conversion

system. We believe this added headroom is a

groundbreaking improvement.

32-bit SABRE Conversion

System

Four balanced 32-bit D/A converters deliver

audio to Benchmark's low-impedance current

to voltage converters. The 4:1 redundancy

reduces noise and distortion to levels that set

new benchmarks. The conversion system at

the core of the DAC2 is as good as it gets.

The analog circuits that follow the D/A

converter are carefully designed. Benchmark

has leveraged its long history of building

reference analog audio equipment to create

an outstanding output stage.

Diagnostic Display

Ever wonder why that 192 kHz 24-bit

download on your computer just doesn't

sound right? Your media player may be

down-sampling to 44.1 kHz and/or truncating

to 16-bits. Many media players apply poor-

quality sample rate conversion and

truncation. Fortunately these problems can

be eliminated with the selection of a good

frequency-agile media player. The sample-

rate and word-length displays on the DAC2

confirm the proper operation of your media

player.

Bi-Directional 12 Volt Trigger

( DAC2 HGC and DAC2 L

model only)

Benchmark re-invents the 12 volt trigger.

The trigger connection on the DAC2 can be

used as an input or output or both, and is

compatible with any common 12 volt trigger

input or output. The trigger can be used to

turn a power amplifier on or off automatically.

The DAC2 will also respond to a 12 volt

trigger and follow the actions of another audio

component.

Distributed Power Regulation

To achieve the lowest possible noise, the

DAC2 uses distributed power supply

regulation. Each critical subsystem has at

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