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Re: BIOACOUSTICS-L: Moderated Message

To: <>
Subject: Re: BIOACOUSTICS-L: Moderated Message
From: Dave Mellinger <>
Date: Mon, 22 May 2006 13:21:57 -0700
Hi Doug,

Both of those messages have already appeared on Bioacoustics-L (unless you've 
modified them -- I didn't check the details).  Do you still want to post your 


Subject: M-Audio Microtrack 24/96, summary of responses
From: "Douglas Gillespie" <>
To: <>

Following my question a week ago about the M-Audio MicroTrack's low
frequency response, I have received the following information from Gianni
Pavan and Joe Olson. Many thanks to them both. I'm off to the shops. Doug.

From Gianni Pavan...
Here some preliminary results on TSR inputs, phantom off, 96 kHz sampling,
24 bits, latest firmware, signal generator with 50 ohm output

max input before the red LEDs light on (1 kHz sinusoidal):

Level set to MAX with the buttons on the top of the unit:
L    850 mVpp
M    300 mVpp
H    110 mVpp

Level set to MIN:
L    3.3 Vpp

Level set to MAX, plus +27 boost:
L    39 mVpp
M    13 mVpp
H     4 mVpp

Low-end frequency response:
given 0 dB at 50 Hz
  -1.0 dB at 20 Hz
  -2.5 dB at 10 Hz
  -3.0 dB at  8 Hz
  -6.0 dB at  5 Hz
  -8.0 dB at  4 Hz
 -11.0 dB at  3 Hz

High-end frequency response:
flat up to 45 kHz, aliasing-free up to 42.5 kHz (aliased components - if
any - lower than -70 dB)
see the graph on the CIBRA webpage at
Gianni Pavan
Centro Interdisciplinare di Bioacustica e Ricerche Ambientali
Universita' degli Studi di Pavia
Via Taramelli 24, 27100 PAVIA, ITALIA
Tel         +39-0382-987874
Fax        +39-02-700-32921

From Joe Olson ...
Preliminary tests that I ran this evening indicate that the M-Audio
MicroTrack frequency response is down by only approximately 1 dB at 10 Hz,
approx. 12 dB at 2 Hz, and about 23 dB at 1 Hz.  It looks flat from 20 Hz to
40 kHz.
A frequency response plot for the M-Audio MicroTrack 24/96 is posted here:

There is a bit of fluctuation between 10 and 20 Hz due to constraints in
trying to track a peak signal that was moving too fast.

Happy recording!

Joseph R. Olson
Cetacean Research Technology
PO Box 70186
Seattle, WA  98127

Sales: 206-297-1310
       877-824-5432 (outside the Seattle local calling area)
Customer Support: 206-973-7979
United Kingdom: 020-7193-7965
FAX: 206-784-0557
Mobile: 206-650-8676

Douglas Gillespie
Sea Mammal Research Unit,
Gatty Marine Laboratory,
University of St. Andrews,
Fife, KY16 8LB

Tel: +44 1334 462663
Fax: +44 1334 462632

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