[Arny Krueger]

"Dirk Bruere at NeoPax" wrote in
message
Arny Krueger wrote:
"Dirk Bruere at NeoPax" wrote in
message
François Yves Le Gal wrote:
On Mon, 01 Oct 2007 00:39:10 +0100, Dirk Bruere at
NeoPax wrote:

No EQ filters set, in and out sliders to 0dB
Tthe 0 dB are local levels and translate to +22 dB in
the real world.


So what does that mean? That if I put a 1V signal into
the Behringer with 0dB set throughout I'll get 22V
out????

Where this seems to be headed is that:

(1) If the DCX 2496 is set up to be overall, a unity
gain device (2) If the input is 1 volt

then:

The output will be 1 volt.

However, the ca. -96 dB dynamic range of the device will
be referenced to +22 dB which is about 10 volts. The
noise at the analog output terminals of the DCX 2496
will be about 74 dB down. If you put that into a really
large power amp whose gain control is set to max, and
the speakers are fairly efficient, then there will be
considerable audible noise. If you set up the DCX 2496 so that its
overall gain is 5
or 14 dB, and you set the gain of the power amp to be 14
dB less than max, then the noise floor of the DCX2496
will be effectively 14 dB lower, or about 88 dB down.
This will reduce the noise at the speakers to a very
significant degree. There will still be about 6 dB worth
of headroom in the DCX 2496, which should be enough for
a controlled circumstance like this.

Which is what I ended up doing through trial and error.
Still not good enough though, plus I still don't know why
the DCX should be so much worse than the XTA.

I suspect that there are differences in default gain staging.