8
ART300A Service Manual
Rear Panel
1. INPUT is a balanced XLR input jack that
accepts mic-level or line-level signals.
2. OUTPUT is a balanced XLR output jack in
parallel with the INPUT jack, allowing the
signal to “loop through” for daisy-chaining
speakers together.
3. LINE/MIC switch for mic-level or line-level
signals at the INPUT.
4. VOICE equalization switch ON provides a
gentle boost at 3kHz and 6kHz.
5. MUSIC equalization switch ON provides a
low-frequency and high-frequency boost.
6. LIMITER indicator illuminates when the limit-
ing protection circuits are activated.
7. OPERATE indicator illuminates when the
POWER switch is turned on.
8. VOLUME control adjusts the input-stage
gain.
9. POWER switch turns the AC power on and
off.
10. AC OUTLET for connecting AC power to
an additional Mackie Industrial active
speaker system.
11. Grounding Terminal provides an additional
safety grounding point.
12. IEC AC Socket. Connect the detachable
power cord to the socket. The protection
fuse is also contained in the AC socket.
CAUTION: Replace fuse only with the same
type as indicated on the rear panel.
Connections
The XLR connectors use the following AES
standard:
Pin 1 = Ground (Shield)
Pin 2 = Hot (+)
Pin 3 = Cold (–)
1
2
4
5
3
8
10
9
12 11
7
6