Benchmark DAC1 HDR Instrukcja Obsługi Pobierz pdf (Strona 16)

DAC2 Series Instruction Manual Rev C Page 16

HGC™ Volume Control

Hybrid Gain Control™

"HGC" is Benchmark's unique Hybrid Gain

Control™ system. The DAC2 combines

active analog gain control, passive low-

impedance attenuators, a 32-bit digital gain

control, and a servo-driven volume control.

All inputs are controlled by the rotary volume

control. This volume control moves in

response to commands from the remote

control. Analog inputs are never converted to

digital, and digital inputs never pass through

an analog potentiometer. Digital inputs are

precisely controlled in the 32-bit DSP system.

The DSP system preserves precise L/R

balance, and precise stereo imaging, while

avoiding any source of noise and distortion.

Benchmark's unique passive output

attenuators provide distortion-free gain

reduction without reducing the dynamic range

of the converter. The attenuators optimize

the gain staging between the DAC2 and the

power amplifier. This optimization is

absolutely essential for maximizing the

dynamic range of the entire playback system.

Much of the success of the DAC1 converters

can be attributed to the passive output

attenuators. Musical details can be obscured

by system noise whenever a preamplifier and

power amplifier are improperly matched. The

HGC system will make full use of your power

amplifier's dynamic range. Experience the

new details in your favorite recordings.

The front-panel volume control is a servo-

driven gain circuit control built around a

custom-made Alps potentiometer. The

custom Alps pot is equipped with remote-

controllable motor drive.

This potentiometer is equipped with a clutch

which prevents damage from overriding the

motor drive. If the pot is driven beyond the

end of its range, it will not damage the motor.

Also, if the pot is manually overridden, it will

not damage the motor.

The XLR outputs have jumper-enabled

passive attenuators that can be used to

optimize the gain structure of the playback

system.

TIP: For optimal performance and

minimal noise, the XLR gain jumpers

should be set so that comfortable

listening levels occur when the ‘Volume

Control’ is set above 11 o’clock.

Instructions for setting the XLR pads are

detailed in the ‘Internal Settings’ section of

this manual. The DAC2 is shipped with the

XLR attenuation set to -10 dB.

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