Re: Best Soundcard for RMAA Measurements?

"ezkcdude" <zamir.evan@xxxxxxxxx> wrote in message
news:1182433351.298733.47790@xxxxxxxxxxxxxxxxxxxxxxxxxxxx

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.

I presume price/performance is an issue.

If price is no issue, then the Lynx L22 is one of the cleanest cards
around - it is essentially a LynxTwo with just two input and output
channels.

Clearly, I don't want the soundcard A/D to
be the limiting factor, in terms of S/N, DNR, THD, etc.

Depending on what you are measuring, the audio interface is *always*
potentially an issue. If you spend the big bucks on an Audio Precision test
set, then it is going to be potentially an issue.

I figure you guys must have some suggestions for me. I've
looked at E-MU 1212M (seems ideal, except has balanced
inputs)

The EMu 1212M uses about the same converters and buffers as the L22, so its
performance is in the same range. It is a lot less costly, so it has
potentially better price performance. The problem with EMu cards has
historically the absence of MMC drivers that fully exploit their cards. EMu
has always given highest priority to ASIO drivers. Last time I looked, RMAA
doesn't support ASIO, although I see they have a new release just out that
may.

and 0404 USB, M-Audio 2496 and USB Audiophile,

The M-Audio 2496 is good enough, but its not their best card. The 24192 is a
far better card.

It has been pointed out that passive analog circuitry can be used as a
pre-processor to improve sound card-based test equipment residuals. This can
help, but it is not an infinitely extensible approach.

Another approach is purely practical - if all residuals are 100 dB down,
they are more than far enough down for just about any practical purpose.



.

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