High Resolution Conversion Of Mono LPs To Digital Format

I'm planning to convert some old mono LPs from the 50's to digital format and I'm thinking of buying a Numark USB turntable to do this. If I set the sample rate to 192,000 and turn 24 bit recording on, will I be able to capture an audio track that truly reflects these setting? Or will the signal be degraded somewhere along the line before it gets into Logic? When the turntable converts the analog signal into a digital signal that can pass into the computer via the USB connection, are there limitations to this digital signal?
I also have a Firewire Alesis MultiMix 8. So I can also get a regular turntable and pass it into the MultiMix. But again, I wonder if the conversion to a Firewire digital format imposes restrictions on the resolution of the signal.
If anyone can shed light on this, it will be greatly appreciated. Thanks.
MacPro 2x2.66 GHz 2 GB Memory Mac OS X (10.4.8)

There's probably no useful content above 20khz on the
source, and there's no point at sampling much higher
than double the highest frequency of the source.
I'm certainly not an expert in these matters, but my impression is that experts argue passionately about both of these points.
I don't even own a turntable, but I've heard LP supporters claim that a good cartridge can reproduce frequencies several octaves above 20k, and they claim this is one reason why they like the sound. I can't comment from personal experience.
Regarding Nyquist, though, my very limited understanding is that the B / 2B relationship refers only to frequency, not tonal quality. A 40k sampling rate is sufficient for resolving a 20k source frequency, but at two samples per period, it sure isn't going to give you any meaningful resolution on that waveform (i.e. a 20k sine wave and a 20k square wave are going to be sampled identically at a 40k rate, right ?) Seems to me that even if you restrict audio to a 20-20k frequency band, increased sample rates are going to give you increased resolution, and while there will certainly be diminishing returns, there's not necessarily a ceiling on what might be perceived as better sound. One way to think about analog sound is that it has an infinite sampling rate... maybe increasing the sampling rate will ALWAYS get closer to an analog sound source ?
Ahem... hey... not trying to be argumentative, tele_player... it's an interesting discussion, at any rate...
The point I was trying to respond to was more practical, though... I think Martin's point was that there was some specific disadvantage to higher sampling rates, regarding plug-ins ? A disadvantage other than the obvious (increased bandwidth) ?
James
[email protected]

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''The whole dpi-ppi thing is nit-picking.''
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Hi
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from post ??
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Mike,
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how can you save keynote slides as high resolution (300 dpi)
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High Resolution Conversion Of Mono LPs To Digital Format

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