Manual

Apollo Twin USB Hardware Manual Controls & Connectors 21

(11) Preamp Option Buttons

These six buttons control the preamp options (labeled a – f below) when the input

channel is selected (3). The preamp option is active when its indicator is lit. When

Monitor (6) or Headphone (8) is selected, the preamp options cannot be modiﬁed and

this portion of the display is unlit.

Unison Integration: The Preamp Options can also be used to control Unison-

enabled UAD preamp plug-ins. See the Apollo Software Manual for complete

Unison details.

Refer to the illustration below for control descriptions in this section.

Apollo Twin USB’s preamp option buttons

(a) Input Select

Selects the active input jack for the channel. Press to alternate between the mic & line

inputs. The current selection is displayed by the input type indicators (5).

The Hi-Z input is selected automatically whenever a ¼” mono (tip-sleeve) plug is

connected to the front panel’s Hi-Z Instrument jack (12).

Note: Hi-Z input is available for channel 1 only.

(b) Low Cut Filter

Enables a low cut (high pass) rumble ﬁlter with a cutoff frequency of 75 Hz.

Enables 48-volt phantom power for the mic input. Phantom power is typically needed for

condenser microphones. +48 is available for the microphone inputs only.

Caution: To avoid potential equipment damage, disable +48V phantom power on

the channel before connecting or disconnecting its XLR input.

(d) Pad

Attenuates (lowers) the input signal level by 20 dB. Pad is unavailable for the line inputs

and the Hi-Z instrument input.

(e) Polarity Ø

Inverts the polarity (aka “phase”) of the input signal.

(f) Link

Links inputs 1 & 2 so both channels are adjusted simultaneously as a stereo pair.

Note: Link cannot be activated when a plug is inserted in the Hi-Z jack (12).

a b c d e f