They really don't
The same voltage at the input will clip the converter no how far down you turn the control. You can make it clip earlier by turning up the control, but that's just making your signal to noise ratio worse. There is no attenuation or amplification of the analog signal happening before it hits the converter.On Sun, Jul 17, 2016 at 8:57 PM, Tim E. Real <termtech@xxxxxxxxxx> wrote:
On Saturday, July 16, 2016 11:17:10 AM EDT Robert Edge wrote:
> There is no actual analog volume control on the 1010LT's RCA inputs, it's
> just doing multiplication on the captured signal after the ADC.
What - did I read that right?
This card definitely has analog volume input control.
The 'Analog Volume' mixer tabs in Envy24 or Mudita24 control it.
> If you are
> clipping the input turning the volume down in the software interface just
> gives you a scaled down version of the clipped signal.
>
> It is better to monitor the actual numbers coming off of the ADC chip.
> That way 0 dbFS on your meter in Ardour or whatever is actually 0dbFS at
> the ADC.
>
> In Envy24 control that means setting the 'analog volume' slider to 127,
> that's where you are actually seeing what's coming off the chip. Above
> that and the captured signal is being scaled up and below that the captured
> signal is being scaled down. Control your input level in the analog world
> before you hit the card. Shoot for peaks around -12dbFS.
>
> Also: there are jumpers on the card itself, you can use the XLR inputs as
> line level balanced ins. In my experience that's the best fidelity you can
> get with this card.
BTW About the jumpers that control input level: There are undocumented
'in-between' jumper settings for the input level. (The jumpers just switch
various resistors in or out.)
I discovered the settings and was forced to use them when the existing
choices of levels were not quite enough for me.
Tim.
>
> (been using a 1010LT on Linux since 2006 or so...)
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