Re: BIOACOUSTICS-L: Moderated Message

[Dave Mellinger <>]

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 
message?

Dave



> 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
> http://www.unipv.it/cibra/res_techtest_uk.html
> --------------------------------------------------------------
> Gianni Pavan
> Email 
> 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
> Web       http://www.unipv.it/cibra
>
>
> > 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:
> www.cetaceanresearch.com/M-Audio_MicroTrack_24-96_Freq_Response.pdf
>
> 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!
> Joe
>
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 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
>
> www.cetaceanresearch.com
>
>
> ==========================
> Douglas Gillespie
> Sea Mammal Research Unit,
> Gatty Marine Laboratory,
> University of St. Andrews,
> Fife, KY16 8LB
> Scotland.
>
> Tel: +44 1334 462663
> Fax: +44 1334 462632