Meridian Audio operation manual About The Product, C51 Powered Crossover/Amplifier

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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

8Ω (160W into 4Ω) 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 8Ω
	/ 160W into 4Ω, 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	20–150mΩ, 1–20kHz
THD+Noise	Typical: 0.1% @ 60W output,
	0.008% @ 1W
Full-range Inputs	5 x Mono unbalanced (phono)
	impedance 10 kΩ
	5 x Mono balanced (XLR3F)
	impedance 20 kΩ/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.

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