C l e a r l y b e t t e r s o u n d
E&OE
Issue_1.0
The power amplifiers shall be available in four channel and eight channel
versions. Either version shall be capable of driving 50 W per channel
into a 4 ohm load when all channels are driven simultaneously.
The amplifiers’ front panels shall incorporate an AC power switch,
an LED indicating POWER ON, and LEDs indicating Signal Present,
Peak Level and Protect status for each channel. The Signal Present
LEDs shall illuminate when the output level is 22 dB below the rated
output. The Peak LEDs shall illuminate at the onset of signal clipping.
The Protect LEDs shall indicate activation of the channel protection
circuitry.
The amplifiers shall be provided with one input per channel and
be able to operate in the following configurations as a minimum:
all channels independent, one input feeding all channels or two
inputs feeding the amplifier channels in pairs for stereo operation.
Signal level adjustment will be provided for each channel via a rear
panel control permitting a range of operation from not less than
90 dB attenuation (min.) to unity gain (max.). The inputs shall be
electronically balanced and capable of operating with both balanced
and unbalanced sources. The input impedance shall be 10 kohms
(balanced). The input connectors shall be of Euroblock type. It shall
be possible to enable a high-pass 3rd-order filter with a turnover
frequency of 65 Hz independently in each amplifier channel.
Each channel shall deliver its rated power from an input signal
of 0 dBu with input level controls set at maximum. Output mute
protection on power-up and thermal protection shall be provided.
The amplifiers will also be protected against short-circuits at the
output, and excessive combination of output voltage and current. The
amplifiers’ outputs shall be on Euroblock connectors.
A range of optional, single-channel transformer modules, and suitable
rackmounting housings, shall be available to permit the amplifiers
to drive 100 V-line and 70 V-line loudspeaker systems. It shall also
be possible to adapt the four channel amplifier version for direct
connection to 100 V-line and 70 V-line systems by the addition of an
internally-fitted four-channel transformer module.
An optional remote control shall be available for any or all amplifier
channels, to allow adjustment of channel gain. The remote control
connector shall be of Euroblock type. It shall also be possible to fit
optional EQ cards to any or all channels to suit a range of current,
popular loudspeaker types.
The amplifier shall be built in a steel chassis suitable for mounting in
a standard 19” equipment rack, and occupy two rack spaces. Variable
speed forced-air cooling shall be employed.
The amplifier shall be available in versions operating on either 230 V
or 115 V AC mains, the intended mains voltage to be specified by the
user at the time of order.
The power amplifiers shall be the Cloud CX-A450 (four channels)
and CX-A850 (eight channels).
Architect’s and Engineer’s Specification
