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PRE420 Instruction Manual – rev. E Page 23

Noise Spectrum

32k B-H FFT, Gain = 60 dB, 0 dBr = 0 dBu at input

Audio Precision

02/19/07 11:27:19Noise Spectrum, Gain = 60 dB, 0 dBr = 0 dBu at Input

ColorSweep Trace Line Style Thick Data Axis Comment Cursor1 Cursor2

1 1 Red Solid 4 Fft.Ch.1 Ampl Left *-145.066 dBr A *-149.014 dBr A

-200

-190

-180

-170

-160

-150

-140

-130

-120

-110

-100

-90

-80

-70

-60

-50

-40

-30

-20

-10

-145.066

-149.014

10 30k20 50 100 200 500 1k 2k 5k 10k 20k

59.6606 180.657

dx=120.996 Hz

dy=-3.948 dB

The above graph demonstrates that the PRE420 is free of hum and noise. The highest tone is 60-

Hz line-related hum and is at a level equivalent to an input level of -145 dBu. 180-Hz hum is at an

equivalent input level of -149 dBu.

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Benchmark MPA1 Bedienerhandbuch Seite 23