Hi Raimund!
Very many thanks for this enlightening piece of technical commentary. It would
appear that this is actually better than I thought it was!
I, and possibly others, would be interested to hear your opinion of what 'a
suited recording software' might be, although I suppose that might depend upon
the operating system.
Very best regards
Max
--- In "Raimund Specht" <>
wrote:
>
> Hi Max,
>
> I have also tested this unit and can confirm that it has a very flat
> frequency response up to 90 kHz. The frequency response of such units is
> mainly determined by the A/D converter chips in them. The E-MU Tracker
> employs the AK5385A chip, which is one of the best A/D chips that are
> currently available.
>
> http://www.emu.com/products/product.asp?product=17511&nav=technicalSpecifications
>
> The frequency respones of the A/D chip at 192 kHz is described at page 10 of
> its data sheet:
>
> http://www.asahi-kasei.co.jp/akm/en/product/ak5385b/ak5385b_f00e.pdf
>
> The relevant number here is the passband attenuation of only -0.06dB at 89
> kHz.
>
> This means that its frequency response at the 192 kHz sample rate is better
> than that of the SoundDevices 7xx recorders for instance. The E-MU Tracker
> Pre preamplifier noise level of -127dBu (unweighted) is also excellent.
>
> So, combining the E-MU Tracker Pre with one of the cheap Netbook computers
> (and a suited recording software) would indeed create a cost-efficient and
> still high-quality recording system for stationary use in the field.
>
> However, there is one detail that is a bit annoying. The firmware of the
> E-MU-Tracker Pre does not keep the 192 kHz sample rate setting after
> switching off the unit. So, you need to manually set the 192 kHz sample rate
> option on its (software) Control Panel each time after booting the computer.
>
> Regards,
> Raimund
>
> http://www.avisoft.com
>
> --- In "Max Catterwell" <maxcatterwell@>
> wrote:
> >
> > Hi Gianni,
> > I have just been looking at this piece of equipment, and have more or less
> > decided to buy. Did you get the graphs you mentioned done yet please? I'd
> > be very interested to see them.
> > All the best
> > Max
> >
> >
> > --- In Gianni Pavan <gpavan@> wrote:
> > >
> > > Hi all,
> > > I would share some tech information about audio interfaces.
> > >
> > > the E-MU Tracker Pre is a USB powered audio interface with 192kHz
> > > sampling. It costs less than 150$ and offers pretty good performances.
> > > The frequency range is flat up to 90 kHz and the anti-aliasing
> > > filtering is good. I tested it up to 200 kHz at full level and it
> > > produces aliased components for input signals in the range 96 to 105
> > > kHz; resulting aliases lie in the range 96 to 87 kHz. Graphs will be
> > > shown soon on our website.
> > > This interface has only analog I/O. At max gain the mic inputs accept
> > > levels up to 18mVpp (measured between pins 2 and 3 of the XLR input).
> > > By comparison, the Edirol UA 25 EX has greater gain: at full gain
> > > (knobs fully turned clockwise) it overloads with input level greater
> > > than 10mV.
> > >
> > > Gianni
>
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