14 Jan
2009
14 Jan
'09
9:45 a.m.
Fons Adriaensen wrote:
On Wed, Jan 14, 2009 at 11:10:28AM +0100, Arnold
Krille wrote:
Also about a year ago I measured frequency response, total harmonic
distortion (over the full dynamic range) and noise floor for a number of
aduio interfaces, including Behringer Ultragain Pro 8 digital, and RME
ADI8 Pro. I did only look at technical performance, not at handling. The
difference between those two was surprisingly small, except for the THD,
which was significantly higher for Behringer especially at high gain. I
did not observe extremely strange frequency responses at the Behringer,
only a small ripple (below 0.3 dB). I cannot find the data right now. If
I find it I can send it to the list (or present it at LAC, my
presentation there will include delay measurements of audio devices anyway).
Giso
Which might be true for the digital part. But my
general experience with that
specific manufacturer is that the over-all design both in electronics and in
other hardware is not as good as the originals they are copying. Begins with
cheaper plastics for the knobs, goes on with not-top-of-the-line pre-amplifiers
and doesn't end with cross-talk from the pfl-listening into the pre-fader-aux
Last year I did some equivalent input noise measurements on
the mic inputs of various interfaces, including a Behringer
Ultragain Pro 8.
To my surprise, noise level was not bad at all _at full gain_.
But the spectrum at max gain, which should be flat, had some
strange bumps (I really wonder how they do it). Also, a good
mic preamp should have roughly the same EIN over a range
of at least 20 dB below max gain, but Behringer's goes up
very fast once you move the gain knob. This indicates very
bad analog design. And then there are the cheap gain pots
with their silly mechanical detents. Moving one notch down
can give you anything between -5 and -15 dB below the max,
and in the upper range even matching to channels for a
stereo mic is almost impossible. Again this is bad design.