On 01/08/2014 02:41 PM, Fons Adriaensen wrote:
I had calibrated -18dBFS on all of them to the same source (a 1KHz sine,
which I believe to be 0 dBu). That's how I found out about the rubber
controls effect in the first place.
I also did two another measurements, setting the gain-dial of each
devices at minimum and maximum. The 18i6 still came out worst.. but that
is not too unexpected. The gain range of the 18i6 is about -10dB ..
+30dB (per specs it should be -10..+36), while on the other two it's
-20dB .. +20dB.
I also have one of them each. So maybe I was unlucky to get a bad/good
device. I also did not have access to pro-equiment to calibrate &
measure them, but identical equipment was used to evaluate all.
>> That make we wonder which award those 'award winning' preamps of
right. They don't need to be exact to the degree but at least give an
indication. "About +5dB" is more useful that just a number, IMHO.
> I'm enquiring about this for a friend who needs an USB card to be
The form-factor of the 18i8 is probably a bonus in this case.
Skimming over http://wiki.linuxaudio.org/wiki/hardware_support
the only comparable device would be the Alesis iO4 (unless you also
consider more expensive equipment with more than 4 inputs).
for environmental noise measurement, the devices do not need to be
sample-sync, do they? You could probably use two stereo USB1 devices.
Linux-audio-user mailing list