Lab.gruppen C Series C 16 4 Operation Manual page 6

6 QUICK GUIDE OVERVIEW
6.1 front-Panel overview
The amplifier's front panel presents the performance
and fault condition indicators, power and remote
switches, and a removable dust-filter cover. Four
level potentiometers located behind the cover
provide individual attenuation for the four amplifier
channels. Range is 0 dB to - infinity. The 12 o'clock
position indicates -10 dB attenuation. A label area is
located beneath the LED display.
To remove the dust-filter cover, loosen the
thumbscrew at the far left. This allows removal of
the dust-filters for cleaning, and provides access to
channel attenuation. The front cover may be made
"tamper resistant" by replacing the thumbscrew
with a Philips head or safety Torx screw. Thread
size is M3.
Never operate the amplifier without the dust
-filters in place.
When no VPL,
CPL or PAL
indicators are
i l l u m i n a te d ,
and the VPL DIP-switch
is set to maximum at the
specified nominal load,
the amplifier channel is
able to deliver maximum
rated output power.
When the network is con-
PAL
nected, the blue NomadLink
LED will illuminate even
when mains power is not
connected. NomadLink receives
phantom power from the network
supplied by the NLB 60E.
10 C Series C 68:4, C 48:4, C 28:4 and C 16:4 Operation Manual
6.1.1 Power on/off and remote switch
The Power on/off switch is located on the right side. A
second switch, labeled "REMOTE," is located above
the Power switch. When the Remote switch is on, (with
the mains connected and power switch turned on)
the yellow LED above it will illuminate indicating that
external power on/off commands from the NomadLink
network connection will switch the amplifier on or
off. When Remote is activated the amplifier will not
switch on until a "Power On" command is received
from the network. When the remote switch is off,
it is not possible to switch amplifier power on or off
using NomadLink network control.
6.1.2 front-panel LEd's
The front-panel LED area includes the following
indicators per channel:
• Temperature mute (Yellow constant)
• Vhf (Very High Frequency) protection active
(output muted) (Yellow)
• Mute channel via NomadLink network (2x Yellow)
• CPL (Current Peak Limiter) active (Orange flashing),
• CPL constant (output muted): Lo impedance / Short circuit
detection
• fault (Yellow plus Orange)
• VPL (Voltage Peak Limiter) active, VPL/Clip (Red)
• 4 dB signal level (Green)
• -10 dB signal level (Green)
• -40 dB signal level (Green),
• hi-Imp open load detected (Red)
• Bridge mode operation on (Yellow). Ch. A+B or C+D
bridged.
.
Power on (Green)
PAL (Power Average Limiter) active (Red)
Option active (Yellow)
NomadLink network active (Blue).
6.2 Rear-Panel overview
44dB
41dB 141V* 71V
118V 59V
38dB
200-240VAC 50-60Hz :2300W
35dB 100V** 50V
PUSH PUSH
32dB 85V 42V
29dB
26dB
23dB
Must be grounded
Made in Sweden *100V rms **70V rms
Mains input 115 V NomadLink
and 230 V operation network In and Out for adjusting key
(Not selectable) on EtherCon-housed
RJ45 connections
.
C Series C 68:4, C 48:4, C 28:4 and C 16:4 Operation Manual 11
QUICK GUIDE OVERVIEW 6
SPEAKER OUTPUTS
Ser. N:o
Removed!
WIRING
NORMAL: CLASS 2
BRIDGED: CLASS 3
BALANCED INPUTS
CH D CH C CH B CH A
DIP-switches 3-pole Phoenix- 2-pole screw
type input terminal output
features connectors connections
(See below)
6.2.1 The dIP-switch features
The following features may be adjusted using the
DIP-switches on the rear-panel of the amplifier.
Gain - Set for all four channels from +23 dB to +44
dB in 3 dB steps.
Option active - Available for future upgrades.
fan Masked - When on, engages the intelligent fan
feature which lowers fan speed when no signal is
present.
Bridged Mode- Switches the channel pairs (A+B
and/or C+D) into bridged mode operation (automatic
-6 dB gain compensation).
VPL - Voltage Peak Limiter adjustment is
provided for 8 individual levels. Select the setting
most appropriate for connected speakers. See
Appendix for details.
Mode - Select VPL mode to either Hard or Soft-
operation. For channels driving sub-woofers and
low-frequency drivers, it is recommended to use
the Hard setting for optimal operation. For mid- and
high- frequency drivers, always select Soft.