Frequency Response,FFT Spectrum Analysis

Measurements

Audio Precision

Frequency Response

05/09/05 14:48:13

 

2591 MixDream XP

 

 

+10

 

 

 

 

ExpansionInput, FixOutput

 

 

 

 

 

 

+9

 

 

 

 

 

 

 

 

 

 

 

 

 

+8

 

 

 

 

 

 

 

 

 

 

 

 

 

+7

 

 

 

 

 

 

 

 

 

 

 

 

 

+6

 

 

 

 

 

 

 

 

 

 

 

 

 

+5

 

 

 

 

 

 

 

 

 

 

 

 

 

+4

 

 

 

 

 

 

 

 

 

 

 

 

 

+3

 

 

 

 

 

 

 

 

 

 

 

 

 

+2

 

 

 

 

 

 

 

 

 

 

 

 

d

+1

 

 

 

 

 

 

 

 

 

 

 

 

B

 

 

 

 

 

 

 

 

 

 

 

 

 

r

-0

 

 

 

 

 

 

 

 

 

 

 

 

A

-1

 

 

 

 

 

 

 

 

 

 

 

 

 

-2

 

 

 

 

 

 

 

 

 

 

 

 

 

-3

 

 

 

 

 

 

 

 

 

 

 

 

 

-4

 

 

 

 

 

 

 

 

 

 

 

 

 

-5

 

 

 

 

 

 

 

 

 

 

 

 

 

-6

 

 

 

 

 

 

 

 

 

 

 

 

 

-7

 

 

 

 

 

 

 

 

 

 

 

 

 

-8

 

 

 

 

 

 

 

 

 

 

 

 

 

-9

 

 

 

 

 

 

 

 

 

 

 

 

 

-10

 

 

 

 

 

 

 

 

 

 

 

 

 

20

50

100

200

500

1k

2k

5k

10k

20k

50k

100k

200k

 

 

 

 

 

 

 

Hz

 

 

 

 

 

 

 

 

 

 

 

A-A FREQ RESP 20Hz-200kHz.at2c

 

 

 

 

 

 

Audio Precision

FFT Spectrum Analysis

05/09/05 14:41:38

 

2591 MixDream XP

 

 

+20

 

 

 

ExpansionInput

Noise Spectrum

 

 

 

 

 

+10

 

 

 

 

 

 

 

 

 

 

+0

 

 

 

 

 

 

 

 

 

 

-10

 

 

 

 

 

 

 

 

 

 

-20

 

 

 

 

 

 

 

 

 

 

-30

 

 

 

 

 

 

 

 

 

 

-40

 

 

 

 

 

 

 

 

 

 

-50

 

 

 

 

 

 

 

 

 

d

-60

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

B

 

 

 

 

 

 

 

 

 

 

u

-70

 

 

 

 

 

 

 

 

 

 

-80

 

 

 

 

 

 

 

 

 

 

-90

 

 

 

 

 

 

 

 

 

 

-100

 

 

 

 

 

 

 

 

 

 

-110

 

 

 

 

 

 

 

 

 

 

-120

 

 

 

 

 

 

 

 

 

 

-130

 

 

 

 

 

 

 

 

 

 

-140

 

 

 

 

 

 

 

 

 

 

-150

 

 

 

 

 

 

 

 

 

 

20

50

100

200

500

1k

2k

5k

10k

20k

 

 

 

 

 

Hz

 

 

 

 

 

 

 

 

 

 

A-AFFT Noise .at2c

 

 

 

 

 

Audio Precision

FFT Spectrum Analysis

05/09/05 14:46:52

 

2591 MixDream XP

 

 

+20

 

 

ExpansionInput, FixOutput

Input Level:+10dBu

 

 

 

 

+10

 

 

 

 

 

 

 

 

 

 

+0

 

 

 

 

 

 

 

 

 

 

-10

 

 

 

 

 

 

 

 

 

 

-20

 

 

 

 

 

 

 

 

 

 

-30

 

 

 

 

 

 

 

 

 

 

-40

 

 

 

 

 

 

 

 

 

 

-50

 

 

 

 

 

 

 

 

 

d

-60

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

B

 

 

 

 

 

 

 

 

 

 

u

-70

 

 

 

 

 

 

 

 

 

 

-80

 

 

 

 

 

 

 

 

 

 

-90

 

 

 

 

 

 

 

 

 

 

-100

 

 

 

 

 

 

 

 

 

 

-110

 

 

 

 

 

 

 

 

 

 

-120

 

 

 

 

 

 

 

 

 

 

-130

 

 

 

 

 

 

 

 

 

 

-140

 

 

 

 

 

 

 

 

 

 

-150

 

 

 

 

 

 

 

 

 

 

2k

4k

6k

8k

10k

12k

14k

16k

18k

20k

 

 

 

 

 

Hz

 

 

 

 

 

 

 

 

 

 

A-AFFT .at2c

 

 

 

 

 

Well, we think this is „linear frequency response“ in the word‘s best possible sense: even at 200kHz the fall-off is below -1dB.

And mind you, typical frequency response measu- rements are related to a -3dB fall-off.

The FFT Spectrum Analysis above shows the spectrum of noise components. We have a very low overall level here, in particular without ugly „spikes“.

The analysis below shows distortion components at an input level of +10dBu. There is no distortion

present above the MixDreamXP‘s outstan- ding, low (THD+N = -103dB) noise level.

MixDream XP

15

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Sound Performance Lab Model 2591 manual Measurements

Model 2591 specifications

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