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CHAPTER 3: AMPLIFICATION AND AUDIO
The Acheron Designer’s low- and high-frequency drivers are
powered by an extremely efficient onboard two-channel,
Class-D amplifier that uses minimal AC power when idle.
Internal signal processing includes a complex crossover, fre-
quency and phase correction, and limiters that prevent
driver overexcursion and regulate voice coil temperatures,
ensuring maximum driver lifespan.
The Acheron Designer rear panel includes a slot for the
optional RMS module, used for connecting to the RMS
remote monitoring system (see Chapter 5, “RMS Remote
Monitoring System”).
AUDIO CONNECTORS
The Acheron Designer includes female XLR Input and male
XLR Loop output connectors.
Input Connector
The female XLR Input connector accepts a balanced audio
signal with an input impedance of 10 kOhm. The connector
uses the following wiring:
■ Pin 1 — 1 kOhm to chassis and earth ground (ESD
clamped)
■ Pin 2 — Signal (+)
■ Pin 3 — Signal (–)
■ Case — Earth (AC) ground and chassis
Pins 2 and 3 carry the input as a differential signal. Pin 1 is
connected to earth through a 1 kOhm, 1000 pF, 15 V
clamped network. This circuitry provides virtual ground lift
for audio frequencies while allowing unwanted signals to
bleed to ground. Make sure to use standard, balanced XLR
audio cables with all three pins connected on both ends.
Telescopic grounding is not recommended, and shorting an
input connector pin to the case may cause a ground loop,
resulting in hum.
TIP: If unwanted noise or hiss is produced by
the loudspeaker, disconnect its input cable. If
the noise stops, there is most likely nothing wrong
with the loudspeaker. To locate the source of the
noise, check the audio cable, source audio, and AC
power.
Acheron Designer Rear Panel with Optional RMS Module
AC LOOP
OUTPUT
100-240V~
50-60 Hz
8A MAX
Class 1 Wiring
AC INPUT
RATING
100-240V~
50-60 Hz
4A MAX
Looping Audio Input
10k Balanced
Limit
On / Status
2
3
1
Earth/Chassis
GND Circuit
1k
Loop
Input
DO NOT
DISCONNECT
UNDER LOAD
Made in USA with domestic and foreign parts www.meyersound.com
AVIS
RISQUE DE CHOC
ELECTRIQUE
NE PAS OUVRIR
CAUTION
RISK OF
ELECTRIC SHOCK
DO NOT OPEN
COMMERCIAL
AUDIO SYSTEM
3JKB
Wink
Activity
Identify
Remote Mute
Disable Enable
RMS Network
NID: 001848623900
RMS 4.0
Firmware
Acheron Designer Audio Connectors, Input and Loop Output
Looping Audio Input
10k Balanced
Limit
On / Status
2
3
1
Earth/Chassis
GND Circuit
1k
Loop
Input