--- In [email protected], Johan Bodin <[EMAIL PROTECTED]> wrote:
>
> Hello,
>
> is there anybody on this list who has experience of
> the "Terratec Producer" model PhaseX24FW or Phase24FW
> (which has equal performance spec's but less knobs and
> connectors)?
>
> Some of the spec's:
> - analog playback with up to 24 bit/192 kHz resolution
> - analog recording with up to 24 bit/192 kHz resolution
> - digital playback with up to 24 bit/96 kHz resolution
> - digital recording with up to 24 bit/96 kHz resolution
> - digital interface for S/PDIF, AC3 and DTS formats
> - 24-bit/192 kHz A/D converter with 110 dB (A) SNR*, 109 dB(A) SNR
typical
> - 24-bit/192 kHz D/A converter with 114 dB (A) SNR*, 111 dB(A) SNR
typical
>
> After reading the manual carefully, two questions remain:
>
> 1. Can this box really deliver a true 192 ksps 24-bit 2-channel audio
> stream to a Windows application?
Sure as long as the Windows App can handle 192k/24 streams ... You
better have some punch behind it though, minumum 1 Ghz, 2Ghz or more
preferable
> 2. What is the audio bandwidth at 192 ksps? Is there a ~20kHz anti-alias
> filter lurking inside or can I expect to enjoy "near-Nyquist"
bandwidth?
There may be some simple filtering,(like 6 db per octave) although
most of it is well out there from 20Khz for reasons of phase shift in
the passband ... most of the filtering on modern audio converters is
done digitally by the converter and based on sampling speed
> 3. The weighted SNR figures given are for the ADC and DAC alone, not for
> the total system... I hope that they are not using an LM324 for
analog
> buffering :-)
There is where your real risk is, it could be as bad or worse than a
Audigy 2 or as good or better than a Delta44 .... personally I'd go
with a Delta4 because you'll have a hard time beating the
cost/performance ratio of that soundcard ... the only drawback (easily
fixed or avoided) is the grounding at the computer end of the of the
breakout box connector which can be cut (but will void warranty) or
the proper way, feed it with a balanced signal like it wants and
deserves ... the SDR 1000 made a real mistake of not providing a
balanced out while at the same time recommending using a Delta44 when
all it takes is a dual opamp chip and a handful of components to do
the job and render groundloops null and void ... most people wrongly
believe pro studios still use balanced lines mainly for common mode
noise when the real reason is to break up ground loops which is where
most noise comes from in modern semiconductor equipment (It is true
that originally it was for common mode but those problems mostly ended
when 600 ohm equipment and tubes were replaced with high impedance
lines and semiconductors)
> 73
> Johan Bodin SM6LKM
>
>
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>
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