6
may also invalidate this guarantee. Labour and
carriage charges are not covered unless by
local agreement.
Outside the UK, local warranty liability is
restricted to equipment purchased within
the territory. Our agents abroad are only
under contractual obligation to service under
guarantee equipment sold through them. They
are entitled to make a non-refundable charge
for any service carried out on other equipment.
This guarantee does not limit your statutory
rights within the United Kingdom.
ABoUt tHe PRodUCt
The C51 powers 200 and 300 Series Remote
Active installation loudspeakers.
It features active line-level crossovers, switched
balanced and unbalanced inputs, and employs
a powerful new amplifier design which enables
multiple channels of high-level amplification
to be combined in a compact unit without
excessive heat.
Ten channels of approximately100W into
8
Ω
(160W into 4
Ω
) RMS amplification are
provided, grouped into five pairs, each
providing bass and tweeter outputs from a
full-range input.
The crossovers take the form of plug-in
modules which can be inserted at the time
of installation to configure the unit for the
speakers in use. An appropriate card is
supplied with each loudspeaker. Modules are
currently available for the A320, A330 and
A350, and each module includes a pair of
LEDs that confirm the positive and negative
power-rails are operative and identifies the
crossover installed by means of the colour
combination.
Thermal, short-circuit and DC fault protection
circuitry is included. The C51 has soft start, fan
output and trigger input.
The front panel includes five sockets for
installation of the crossover cards, which can
be accessed by unscrewing the transparent
smoked access cover.
Front-panel indicators take the form of blue
LEDs for main power and for each channel,
arranged in high/low pairs so that the status
can be instantly assessed.
The rear panel is divided into five channel
pairs identified as HF (tweeter) and LF (bass).
A single full-range input per channel pair
may be switch-selected between unbalanced
(gold-plated phono connector) and balanced
(XLR3F).
In addition to the power input socket and
power switch, the rear panel also offers a
3.5mm jack socket for connection of an
industry standard trigger input (5–30V, AC or
DC) for remote operation, and a 3.5mm jack
socket for the connection of a 12V DC fan
system. This output is controlled automatically
according to temperature.
C51 Powered Crossover/Amplifier
Output power
10 channels of 100W into 8
Ω
/ 160W into 4
Ω,
arranged in
5 x HF/LF pairs sourced from
full-range input via crossover
module
Frequency response +0/–3dB, 10Hz–50 kHz
(modified by crossover
characteristics)
Output impedance 20–150m
Ω
, 1–20kHz
THD+Noise
Typical: 0.1% @ 60W output,
0.008% @ 1W
Full-range Inputs
5 x Mono unbalanced (phono)
impedance 10 k
Ω
5 x Mono balanced (XLR3F)
impedance 20 k
Ω
/leg
Switch-selected between
balanced and unbalanced
Outputs
LF and HF pairs of gold-plated
binding posts per channel pair
Other connections 12vdc, 5W Temperature
controlled fan output (3.5mm
jack)
5–30V ac/dc trigger input
(3.5mm jack)
Controls
Rear-panel balanced/
unbalanced input switch per
input.
Rear panel main power
switch.
