EXP X-800C, Operating Instructions Manual, Page: 13 / 28

13
CHAPTER 3: AMPLIFICATION AND AUDIO
The low-frequency drivers in the X-800C are powered by a
two-channel proprietary Meyer Sound amplifier with MOSFET
output stages. The audio signal is processed with an elec-
tronic crossover, correction filters for phase and frequency
response, and driver protection circuitry. Each channel has
peak and rms limiters that prevent driver over-excursion and
regulate the temperature of the voice coil.
The X-800C rear panel includes audio connectors for Input
and Loop output, as well as an Input Polarity switch. The
X-800C is also available with an optional RMS module (see
Chapter 4, “RMS Remote Monitoring System”).
AUDIO CONNECTORS
The X-800C include 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 — 220 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 220 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.
X-800C Rear Panel (with NEMA L6-20 AC Connector)
ATENCIÓN : ACCE S O INTERNO S OLO
AUTORIZADO A PER S ONAL TÉCNICO CALIFICADO
ACHTUN G
: G EHÄU S E NICHT ÖFFNEN WARTUN G
UND REPARATUR NUR DURCH ELEKTROFACHKRÄFTE
ATTENTION : ENTRETIEN ET REPARATION
S
INTERNE S NE S ONT AUTORI S EE S QU'AU
PER S ONNEL TECHNIQUE QUALIFIÉ
UK WARNIN G :
THI S APPARATU S MU S T BE EARTHED.
NO OPERATOR S ERVICEABLE PART S IN S IDE.
REFER S ERVICIN G TO QUALIFIED PER S ONNEL
WARNIN GS :
Thi s product mu s t be grounded.
Thi s s urface may reach high temperature s while in u s e.
To en s ure proper operation, allow at lea s t 6 inche s
clearance from thi s s urface and adequate ventilation.
No operator s erviceable part s in s ide.
Refer s ervicing to qualified per s onnel.
To reduce the ri sk of fire or electric s hoc k
do not e x po s e thi s appliance to rain or moi s ture.
Meyer S ound, Ber k eley, CA. U S A
1 2
3
1
3
2
Loop Input
Active
10K :
Balanced
Input Polarity
Networ k
S
ervice
Win
k
Re
s
et
Activity
R e m o t e M o n i t o r S y s t e m
95-125V
~
50-60Hz
1400W RM
S MAX
Operational Voltage Range:
Turn on 85V
~
Turn off 134V
~
Turn on 165V
~
Turn off 264V
~
208-235V
~
50-60Hz
1400W RM
S MAX
Auto-Voltage S elect
Earth / Cha ss i s
1
Ca s e
220K
:
E S D
!
RI S K OF ELECTRIC S HOCK
DO NOT OPEN
CAUTION
2 +
3 +
10
P
-
U SH
R
E
C R K
I
IT
-
10
P
-
U SH
R
E
C R K
I
IT
-
S UB Limit
X-800
E x c Clamp
ME
RM S 3
Firmware
NID: 001848623900
X-800C Audio Connectors, Input and Loop Output
1
2
3
1
3
2
Loop
Input
10K
:
Balanced
Input Polarity
Earth / Cha ss i s
1
Ca s e
220K
:
E S D
2 +
3 +