Apollo Thunderbolt - Page 85

Apollo Thunderbolt Software Manual Console Reference 85
Input Select
This switch switches between the mic and line inputs on Apollo’s rear
panel. Click the Input Select switch or Input Select display to change
the input type. The currently selected input type is highlighted.
To switch the input type in condensed views, click the currently
displayed input type (as shown at right, outlined in red).
Note: Input Select has no effect if the channel’s Hi–Z input is connected,
because preamp channels are automatically switched to the Hi-Z input when a
¼” mono (tip-sleeve only) cable is connected to Apollo’s front panel Hi-Z input
jack.
Low Cut Filter
When enabled, the channel’s input signal passes through a low cut (high
pass) filter. This 2nd-order coincident-pole filter has a cutoff frequency of
75 Hz with a slope of 12 dB per octave by default (the filter can change
when Unison is active in the channel).
The Low Cut filter effects the Mic, Line, and Hi-Z inputs. Low Cut is typically used
to eliminate rumble and other unwanted low frequencies from the input signal.
48V
When enabled, the 48V switch is red and 48 volts of phantom power
is supplied to the Apollo channel’s rear panel Mic input. Most modern
condenser microphones require 48V phantom power to operate. This
option can only be activated when the Mic/Line switch is set to Mic.
Caution: Activate 48V only with compatible equipment such as phantom powered
microphones. Incompatible equipment may be damaged by the applied voltage.
Depending on the current configuration of the Apollo and Console, there may be a
delay when changing the 48V state to minimize the clicks/pops that are inherent when
engaging phantom power. The +48V LED on Apollo’s front panel will flash during any
delay.
Pad
When enabled, the PAD switch is yellow and the channel’s microphone
input signal level is attenuated by 20 dB. Pad does not effect the Line or
Hi-Z inputs.
Pad is used to reduce signal levels when overload distortion is present at low
preamp gain levels, such as when particularly sensitive microphones are used on loud
instruments, and/or if the A/D converter is clipping.