AudioBox 1818VSL, 44VSL and 22VSL
2 posts
Page 1 of 1
Hello

I purchased my 44VSL for audio measurements and started to use recently. But I encountered serious issues with its frequency response range. When I tried to make unit calibration in Room Eq Wizard (REW) it turned out the my unit has disqualifying limitations in freq response. The REW calibration is basically freq sweep with input linked with corresponding input. I made tests on all in/out and also main out and headphones, all results were similarilly poor as for soundcard of this value.

Attached sample results from REW calibration:

Plot 1.
Sample rate: 44100 Hz
-3 dB points: 12,4 Hz, 11,024 kHz
Input device: AudioBox ASIO Driver
Input: 1: Mic/Inst 1
Channel: Left
Input volume: no control
Input RMS target: -20,0 dB
Actual RMS at 1 kHz: -20,2 dB
Output device: AudioBox ASIO Driver
Output: 1: Line Out 1
Sweep level: -20,0 dB
20 Hz .. 20 kHz flatness: +0,0, -431,4 dB

Plot 2.
Sample rate: 48000 Hz
-3 dB points: 12,5 Hz, 11,999 kHz
Input device: AudioBox ASIO Driver
Input: 1: Mic/Inst 1
Channel: Left
Input volume: no control
Input RMS target: -20,0 dB
Actual RMS at 1 kHz: -20,2 dB
Output device: AudioBox ASIO Driver
Output: 1: Line Out 1
Sweep level: -20,0 dB
20 Hz .. 20 kHz flatness: +0,0, -431,4 dB

Plot 3.
Sample rate: 96000 Hz
-3 dB points: 12,5 Hz, 19,391 kHz
Input device: AudioBox ASIO Driver
Input: 1: Mic/Inst 1
Channel: Left
Input volume: no control
Input RMS target: -20,0 dB
Actual RMS at 1 kHz: -20,2 dB
Output device: AudioBox ASIO Driver
Output: 1: Line Out 1
Sweep level: -20,0 dB
20 Hz .. 20 kHz flatness: +0,0, -3,3 dB

Please advise what's wrong with my unit or perhaps I am doing something wrong. Thank you and sorry that my English is not at its best.

Attachments
FR.jpg
User avatar
by maciej6 on Fri Apr 21, 2017 2:18 am
Here's same freq sweep but on Instrument/Line inputs (same system, driver, PC). It looks perfectly flat and OK.

Sample rate: 48000 Hz
-3 dB points: 4,0 Hz, 24,000 kHz
Input device: AudioBox ASIO Driver
Input: 1: Mic/Inst 1
Channel: Left
Input volume: no control
Input RMS target: -20,0 dB
Actual RMS at 1 kHz: -20,9 dB
Output device: AudioBox ASIO Driver
Output: 1: Line Out 1
Sweep level: -20,0 dB
20 Hz .. 20 kHz flatness: +0,0, -0,3 dB

It seems that on Mic inputs 44VSL doesn't comply with specification (20 Hz - 22 kHz, ±0.25 dB). Can anyone from Presonus comment please.

Attachments
FR.jpg

2 posts
Page 1 of 1

Who is online

Users browsing this forum: No registered users and 2 guests