Benchmark DAC1 HDR Manual de instrucciones descargar pdf (Pagina 46)

DAC2 Series Instruction Manual Rev C Page 46

udio Precision DAC2 - THD+N vs AMPLITUDE AT 1 KHZ (w/20 kHz LPF unweighted)

Balanced Outputs, Relative to 0 dBFS, 0 dBFS = +23 dBu

DAC2 - Balanced THD+N vs AMPLITUDE.at27

ColorSweep Trace Line Style Thick Data Axis Comment

1 1 Green Solid 4 Anlr.THD+N Ampl Left

1 2 Red Solid 4 Anlr.THD+N Ampl Left

-120

-96

-118

-116

-114

-112

-110

-108

-106

-104

-102

-100

-98

-14 -0-13 -12 -11 -10 -9 -8 -7 -6 -5 -4 -3 -2 -1

dBFS

Graph Plot 7 - Balanced THD+N vs. Amplitude

This plot demonstrates the very low harmonic distortion produced by the DAC2 at signal levels

ranging from -14 dBFS to 0 dBFS. All variations below -4 dBFS are due to the measurement limits

of the AP 2700 system. The peaks at -13 dBFS are due to an AP 2700 gain range change. In

almost all listening environments, THD will be below the threshold of hearing. The DAC2 is

virtually uncolored by any trace of harmonic distortion.

The DAC2 includes differential amplifiers that remove common-mode distortion components. This

is important, because common-mode distortion is not detected when measuring with the precisely-

balanced inputs on the AP 2700 test set. The THD+N measurements on the unbalanced outputs

confirm the effectiveness of the differential amplifiers. Similar results are obtained by measuring

either side of the balanced outputs relative to ground.

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Benchmark DAC1 HDR Manual de instrucciones Pagina 46