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PRE420 Instruction Manual – rev. E Page 20

THD+N vs. Frequency

Measurement Bandwidth = 10Hz to 80 kHz, Gain = 30 to 60 dB, Output Level = +4 dBu

Audio Precision

02/21/07 09:56:41PRE420 - THD+N vs Frequency at 60 dB Gain, BW=80 kHz

ColorSweep Trace Line Style Thick Data Axis Com ment

1 1 Red Solid 4 Anlr.THD+N Ratio Left 60 dB Gain (top trace)

2 1 Magenta Solid 4 Anlr.THD+N Ratio Left 50 dB Gain

3 1 Blue Solid 4 Anlr.THD+N Ratio Left 40 dB Gain

4 1 Green Solid 4 Anlr.THD+N Ratio Left 30 dB Gain (bottom trace)

0.0001

0.01

0.0002

0.0005

0.001

0.002

0.005

-120

-80

-118

-116

-114

-112

-110

-108

-106

-104

-102

-100

-98

-96

-94

-92

-90

-88

-86

-84

-82

20 80k50 100 200 500 1k 2k 5k 10k 20k 50k

This graph shows that THD+N does not rise with frequency – even at maximum gain.

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