Black Box AC470A, Manual, Page: 6 / 14

This section describes the physical features, controls, and their functions for
the Internal Audio System. See Figure 3.1 for the front-panel location of items
1 through 9. Figure 3.2 shows a back-panel view of the unit, and the location
of items 10 through 13.
Figure 3.1. Front-Panel View Showing Controls and Connectors.
1) Left and Right Audio Speakers — Provide stereo sound at your PC.
2) Stereo Headphone Output — Allows you to listen to stereo output from
your own headphones or earphones.
3) Left LED — This LED is frequency-modulated and flashes during audio
output.
4) Amplified/Direct-Driven Selection Switch (A) — This switch allows you
to amplify the audio input through the Internal Audio System’s built-in
amplifier, or be directly driven by an external amplifier.
5) Left Volume Control —
Controls the audio output level to the left
speaker.
6) Right Volume Control — Controls the audio output level to the right
speaker.
SOUND BOARD PC SPEAKER MIN MAX MIN MAX AMPLIFIER DIRECT
CD INPUT
Internal Audio
System
3. Controls and Functions
6
INTERNAL AUDIO SYSTEM
1
2
3
4
5
6
7
8
9