Gain Slider The + or - buttons give increments/decrements in 0.5 dB steps
Slider range goes from 0 dB to +66.0 dB from left to right
In Mic mode: Sets the Mic Preamplifier’s Gain
In Line mode: Sets the Line Input Sensitivity
A value of 0dB corresponds to an input sensitivity of +24dBu for 0dBFS
A value of +20.0 dB corresponds to an input sensitivity of +4dBu for 0dBFS
A value of +66.0 dB corresponds to an input sensitivity of -42.0dBu for 0dBFS
Mic or Line Switches the Input from the Mic-Pre amplifier to the Line level circuitry. The
button will show the current input signal path it is set for (Mic or Line).
The Line input sensitivity can be adjusted be setting the line gain for each input
of the AD module.
Line Fader of 0 dB, means 0 dBFS for +24 dBu Analog signal level present at
the Line input
Line Fader of + 6 dB, means 0 dBFS for +18 dBu Analog signal level present at
the Line input
Line Fader of + 20 dB, means 0 dBFS for +4 dBu Analog signal level present at
the Line input
Line Fader of + 66 dB, means 0 dBFS for -42 dBu Analog signal level present
at the Line input
Note #1: the MIC and Line inputs are not coupled, meaning that switching from
Mic to Line and vice versa will load its own gain (sensitivity) value
Note #2: The Premium AD converters of Horus have been designed in order to
be able to benefit from the +3.1 dB SA-CD headroom offered by DSD, as per
the scarlet book standard. Therefore a minimum of +6 dB gain is required on
the mic preamp or line input. This gain is applied immediately when the ADs
are switched to DSD (64, 128, 256FS) and is visible in the preamp page. The
gain can be adjusted between +6dB and +66dB in DSD mode. In Line mode,
with a gain of +6dB, an input of +24dBu will generate a signal of +6dB SA-CD,
in Mic mode, with the same gain, an input of +13dBu would generate a signal
of +6dB SA-CD.
To benefit also from this +6dB headroom in DSD on the DA outputs of Horus,
we recommend our users to set the level alignment to -6dB on each DA
module configuration page.
48V This button will turn on 48V phantom power for the channel. If it is lit, it means
that Phantom power is active. Only active on channels set to Mic.
This warning applies ONLY to the initial RUN 3 production batch of AD8 and AD8P and
has been fixed for all modules shipped starting November 2012:
The 48V power MUST be turned off prior to changing the connection in certain patch
bays. Many such patch bays do short the Hot, Cold or both signals to Ground during
insertion or removal of the Jacks with the risk of deteriorating permanently the protective
resistors in the input of the PreAmp circuitry. If an AD module input circuitry is damaged,
following such a short, it will end up permanently having inaccurate gain levels,
distortion or even no signal at all on some channels. That would require hardware
replacements at your own cost, since such damage is not covered by our warranty.
If you still own one of the original and unmodified RUN 3 AD8/AD8P modules we
recommend that you contact your Merging reseller to organize an update of your
module(s), which Merging is pleased to provide free of charge.
PAD A -10 dB Pad can be applied inserted in the Mic Preamp circuitry.
Ø Phase invert button. When lit, it inverts the polarity of the selected input signal.
80 Hz Low cut filter 80 Hz. Second order, 12 dB/octave.
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