Best Soundcard for RMAA Measurements?
Hi, all. I'm new to the group. I have designed a D/A converter, and
I've been thinking about how to go about doing measurements on the
analog (single-ended) RCA output. I will probably use the RMAA
software (you know, because it's free). So, I'm trying to figure out
what soundcard (preferably USB, but internal PCI, if that's better)
would be good for doing these types of measurements. Clearly, I don't
want the soundcard A/D to be the limiting factor, in terms of S/N,
DNR, THD, etc. I figure you guys must have some suggestions for me.
I've looked at E-MU 1212M (seems ideal, except has balanced inputs)
and 0404 USB, M-Audio 2496 and USB Audiophile, Onkyo PCI-SE200, and
some others. It's hard to know what it the best value/performance.
Thanks, in advance, for comments.
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design one more? I take it this is an experiment or learning
experience and not a real audio/musical product.
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Pro-sumer sound card, there is plenty you can do, simply by making an
LC notch filter and attenuating the main signal. Drop it by 20dB, and
virtually any 24 bit sound card will yield information about spurious
outputs right down to the noise. That should be a relatively trivial
task.
Then hire the expensive stuff for no more than a day or so to do the
trickiest measurements.
d
--
Pearce Consulting
#
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either way, the "prosumer" soundcards probably aren't good enough for
what I want to do.
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the DAC you are measuring. I assume your DAC is very clean... if it
isn't, there probably isn't any sense in building it in a world of
cheap soundcards. So this means you need a test rig with converters
that are even more clean.
I think you need to bite the bullet and borrow an Audio Precision testset.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."
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