Meyer Sound acheron designer screen channel loudspeaker User Manual

13

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”).

The Acheron Designer includes female XLR Input and male 
XLR Loop output connectors.

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.

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.

NID: 001848623900