On Fri, Jun 18, 2010 at 1:41 PM, <fons@xxxxxxxxxxxxxxx> wrote:
front panel mic input does not work ALSA 1.0.22 or kernel 2.6.33
If that soundcard really has the dynamic range that the
sales blurb claims it has, then its output level will be
a lot higher than what is expected by the average non-pro
amplifier, including 'audiophile' ones.
Shouldn't the output level be the same, and only the resolution improved -- whatever is the standard peak-to-peak voltage
for consumer audio (~ 2vpp?). Otherwise, we'll risk electrocution when they invent 64 bit DACs :-)
What a strange soundcard: i'd rather buy something with only digital outs and connect an external DAC.
W/r/t the "AV100" chip, I wonder if there's bugs lurking given the fact that it's a relatively new and probably not widely used card:/chip.
Xonar Essence ST AV100 Details[PCI] [ANALOGio] [RCAo] [TOSo] [24bit] [192kHz]front panel mic input does not work ALSA 1.0.22 or kernel 2.6.33
Check the digital level with e.g.
jkmeter, For classic use the K20 mode and ensure you
have a level around 0 dB. For pop use the K14 mode
and again ensure you have around 0 dB.
Many thanks for pointing out jkmeter ( jkmeter-0.4.0-1.fc12.ccrma.x86_64 ). I had to read
/usr/share/doc/jkmeter-0.4.0/README to get an idea of what you meant by K14 and K20:
..........
Instead of providing extra gain for the RMS level,
the K-meter displays it on the same scale as the
digital peak level, but puts the '0dB' mark and the
color change well below the OdB full scale level.
For the K-20 meter it is 20dB down, for the K-14
this is (surprise !) 14 dB.
.........
jkmeter feature request -- MIDI AGC: A MIDI output (!) which in it's most simple form, sends a note-on/note-off on the midi channel where clipping has occurred (then you can use something like Dominic Sacré's http://das.nasophon.de/mididings/ to route to a mixer such as envy24control).
In a more useful form, each clip would reduce the value of a MIDI controller (one per midi channel) by a configurable amount.
A midi input (!) would read output slider values from a mixer like "envy24control -m -M":
-m, --midichannel midi channel number for controller control
-M, --midienhanced Use an enhanced mapping from midi controller to db slider
The midi output of jkmeter++ would then decrement the given controller in envy24control by a configurable amount each time clipping occurred.
.......
The correct alignment procedure would be:
1. Play a piece of music representative of what you
normally listen to.
I usually prefer testing fine soundsytems with Muppet heavy metal (
or black death metal ( http://www.youtube.com/watch?v=Qvsq6_8Hzo8&feature=related ). (PS: j/k :-) )
-- Niels
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