Si ca peut aider voici la réponse du support de behringer
au sujet des distorsions.
Vu sur google en anglais (sujet:Behringer Ultra Curve 8024) :
Dear Luk,
The low frequency distortion which has been detected is caused during
the analog-to-digital conversion. If the input signal level is very
low, this can cause quantisation errors - a physical phenomenon which
affects all digital conversion processes and is not peculiar to the
DSP8024.
At low signal levels, the resolution of the signal becomes poorer in
relation to the amplitude of the signal, giving the signal a "stepped"
characteristic. This results in harmonic impurity, each "square" wave
(or wave segment) contains overtones, most importantly in the higher
frequencies of the audible range. This causes the signal to sound
"fizzy", especially at low levels. The only way to eliminate this
problem on a technical basis is very complicated, and is only to be
found in equipment of a much higher price class.
It is possible to reduce this undesirable effect by ensuring that the
DSP8024 always has the optimum input level. The DSP8024 does not have
it's own input amplifier stage - so it is important to make sure that
the ouput level from the mixing desk is sufficiently high - when using
an operating level of +4 dBu, the optimum level is -4dB. This ensures
that the nominal input level is nearly always above the critical
range, while still leaving enough headroom to allow any individual
band to be boosted without risk of being overdriven.
The ideal solution would be to use the "insert" connections on the
mixing desk - the nominal signal level here is constant, and
independent of the level of the main output fader.
The distortion is exaggerated when the bass frequencies are boosted,
or when there are extreme differences in level between neighbouring
bands. Extreme settings of the parametric filters can also contribute
to the problem. If the graphic curve is the result of an Auto-Q
measurement procedure, then any "unreasonable" differences should be
smoothed out. This applies in particular to a boost to all frequencies
below ca. 50 Hz, where the Auto-Q function attempts to compensate for
the lack of very low frequency response from the loudspeakers.
We would like to point out that this distortion is not due to a
technical fault with the DSP8024, it is a physical phenomenon. This
effect can be minimised by setting up the Ultra Curve Pro as described
above.
We hope that we have been able to help you with this information.
If you are interested in up-to-the-minute information and the latest
Behringer news, then why not visit our website at
www.behringer.com.
If
you require further information to specific products, in addition to
our
e-mail service you can also call our customer support hotline, open
Mondays to Fridays, 09:30 - 18:00 c.e.t. on (+49)(0)2154/92066.
Best regards,
BEHRINGER Spezielle Studiotechnik
)
Créé le 22 Fév 2020 14:13
