User Manual

Apollo 8 Hardware Manual Rear Panel 27

(36) Mic/Line Inputs 1 – 4

Analog preamp inputs 1 – 4 use XLR/TRS combination jacks. XLR plugs are routed to the

channel’s microphone input, and TRS plugs are routed to the channel’s line input.

Inputs 1 – 4 are switched between the XLR and Line connections using the front panel

switch (#4) or the Console application.

Note: The Hi-Z inputs override the Mic/Line inputs on channels 1 & 2.

Adjacent inputs 1 & 2 and/or 3 & 4 can be stereo linked via the front panel Link switch

(#9) or the Console application.

XLR Inputs 1 – 4

The balanced Microphone inputs accept XLR plugs. Pin 2 is wired positive (hot).

+48V phantom power is available for the XLR inputs via the front panel switch (#6) or

the Console application.

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

the channel before connecting or disconnecting its XLR input.

Line Inputs 1 – 4

Line Inputs 1 – 4 accept balanced ¼” TRS phone plugs. Unbalanced ¼” TS plugs can

also be used.

Inputs 1 – 4 Gain

XLR Input Gain

The XLR mic inputs are always routed into the channel’s microphone preampliﬁer.

The gain is controlled by the PREAMP knob (#2) when the channel is selected, or the

Console application. The mic preamps provide up to 65 dB of gain.

¼” Input Gain

Line inputs 1 – 4 can be individually routed into the channel’s preampliﬁer for variable

gain adjustments, or the preamp circuitry can be completely bypassed for the purest

path directly into the A/D converter. This option is set with the LINE INPUT GAIN menu

in the Hardware panel within the Console Settings window. By default, line inputs 1 – 4

are routed into the preamp.

When the preamps are bypassed, line inputs 1 – 4 operate at a ﬁxed reference level

of +4 dBu. When routed into the preamps, gain for line inputs 1 – 4 is continuously

variable with up to 65 dB of available gain.

Note: For related information, see Line Input Gain Bypass.