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. I'll work up a frequency response plot and provide a link to it
early next week along with a description of the test equipment -- a signal
generator with 600 ohm output impedance -- and estimated error.
It looks like it should work very well for your blue whale work, Douglas.
The self-noise level also looks quite low when using a line level input.
Joseph R. Olson
Cetacean Research Technology
PO Box 70186
Seattle, WA 98127
877-824-5432 (outside the Seattle local calling area)
Customer Support: 206-973-7979
United Kingdom: 020-7193-7965
Cetacean Research Technology is a strategic partner of:
Sound Technology, Inc.
Spectra Group - Signal Analysis Division
Sensor Technology, Ltd.
Marine Mammal and Bioacoustics Division
> > -----Original Message-----
> > From:
> > On Behalf Of Michele Manghi
> > Sent: Wednesday, 10 May 2006 2:15 PM
> > To:
> > Subject: R: M-Audio MicroTrack 24/96
> > Dear Douglas,
> > While we do not currently have the frequency response with a
> > reference signal, their "matching" with Sensor Technology
> > hydrophones was measured thanks to Joe Olson - of Cetacean
> > Research Tech - and SensorTech themselves.
> > We are currently using the m-audio microtracks in an
> > underwater acoustic monitoring project in Sicily.
> > Assembled inside a bottom recorder named RASP, and linked to
> > a programmable timer/controller that starts and stops the
> > recording, it is a cost-effective way to go for our small budget.
> > The frequency response of the recorder with matched ST SQ26
> > hydrophones is in a PDF file linked from this page:
> > http://www.nauta-rcs.it/Instruments/RASP/tech/NAUTA_RASP_tech.htm
> > where "frequency response" is mentioned.
> > Hope this helps,
> > Michele
> > _
> > Michele Manghi
> > NAUTA ricerca e consulenza scientifica
> > &
> > CIBRA - Univ. Di Pavia - Italy
> > -----Messaggio originale-----
> > Da:
> > Per conto di
> > Douglas Gillespie
> > Inviato: 10 May 2006 21:58
> > A:
> > Oggetto: M-Audio MicroTrack 24/96
> > Has anyone tested the frequency response of the M-Audio
> > MicroTrack 24/96 at the extreme ends of its frequency range ?
> > It's advertised range is from 20 Hz to 20 kHz. In the past, I
> > have tested other M-audio products (e.g. Delta 44 sound card)
> > and have found that their response at lower frequencies is
> > very good right down to about 2 or 3 Hz and is also excellent
> > up to about 45 kHz when sampling at 96 kHz.
> > I've tried to get information out of M-Audio technical help,
> > but without success. If anyone has made direct measurements
> > of this, or any similar recorders, I'd be most interested.
> > I'm currently most interested in low frequencies between
> > about 10 and 20 Hz (blue whales).
> > http://www.maudio.co.uk/products/en_gb/MicroTrack2496-focus.html
> > ==========================
> > Douglas Gillespie
> > Sea Mammal Research Unit,
> > Gatty Marine Laboratory,
> > University of St. Andrews,
> > Fife, KY16 8LB
> > Scotland.