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PRE420 Instruction Manual – rev. E Page 21

Wideband THD+N vs. Frequency

Measurement Bandwidth = 10 Hz to 500 kHz, Gain = 30 to 60 dB, Output Level = +4 dBu

Audio Precision

02/19/07 16:16:11PRE420 - Wideband THD+N vs Frequency, BW=500 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)

0.001

0.1

0.002

0.005

0.01

0.02

0.05

-100

-60

-98

-96

-94

-92

-90

-88

-86

-84

-82

-80

-78

-76

-74

-72

-70

-68

-66

-64

-62

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

This graph shows that THD+N does not rise above noise – even at very high frequencies. The 500

kHz measurement bandwidth elevates the noise by 28 dB relative to a 20 kHz measurement

bandwidth.

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