User manual

www.merging.com/hapi Page 43
Hapi User Manual
PreAmp Menu
The PREAMP (A/D) menu becomes active if you have 1 or more AD8(P) modules installed in the Hapi
unit, giving full access to the Input controls. Please see below for a description of the buttons available.
All Active: Will select all 8 input channels for function and level grouping
Inactive: Adjustments to the input settings and level affect only the selected
channel only
Note the All button will group all inputs of the same type (Mic or Line)
Gain The Rotary Control will give the user control over the Gain level with
increments/decrements in 0.5 dB steps
The Gain range goes from 0 dB to +66.0 dB from left to right
In Mic mode (M): Sets the Mic Preamplifier’s Gain
In Line mode (L): 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 (M) or Line (L) 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 Hapi 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 Hapi,