Issue_2.0 E&OE
Architect’s and Engineer’s Specication
The mixing amplier shall have three mono output channels; each
channel shall be capable of driving 50 watts into a 4 ohm load.
Two of the output channels shall be congured as primary zones, with
front panel controls for selection of music source, music level and
microphone level in each; the third output channel shall be congured
as a utility output, and have controls of the pre-set type for adjustment
of music and microphone levels.
An optional module shall be available to allow all channels of the
mixing amplier to drive 70 V or 100 V-line loudspeaker distribution
systems. The module shall be retrottable and be contained within the
chassis of the mixing amplier.
The mixing amplier shall be equipped with six unbalanced stereo
music inputs on rear panel phono sockets (RCA jacks) and one
electronically balanced microphone input on an XLR socket.
The microphone input shall be congured to operate with paging
microphones. Each music input shall have a rear panel input gain trim
control with a range of 20 dB. Two-band equalisation adjustment shall
be provided on the rear panel for the music signal in each primary
zone. Two-band equalisation adjustment shall also be available for
the microphone input; phantom power shall be available at the
microphone input when selected by internal jumper. A gain control of
the preset type shall be provided for the microphone input; this shall
have a range of 60 dB.
A control input shall be provided to activate the microphone input
by external contact closure, and route its signal to any or all outputs,
replacing the music signal while the contacts are closed. It shall
also be possible to congure the mixing amplier to perform the
following functions: i) detection of a signal at the microphone input
will automatically reduce the music level by 30 dB, ii) one line input
will automatically override all others in either of the primary zones,
even if unselected; it shall be possible to set the time over which the
selected sources fade back up after the override input ceases to one
of least three values of up to 12 seconds.
Optional remote control plates shall be available to permit control of
i) music level in either primary zone; ii) music source selection and
music level in either primary zone; it shall be possible to retrot these
to the mixer at any time. The remote control plates shall connect
via a rear panel multipin connector. It shall be possible to disable
either the front panel music level or the music level and music source
selection controls by rear panel switches. An external control input
shall be provided to allow muting of the music source by a re alarm
or other external emergency system via isolated, ‘volt-free’ contacts,
and this input shall be congurable to respond to either a short or
open external circuit.
The mixing amplier shall accept a range of plug-in equaliser cards
to permit use with compatible loudspeakers. It shall be possible to t
these in any or all of the outputs.
The mixing amplier shall be built in a 2U steel chassis for mounting
in a standard 19” rack. The mixer will be tted with a front-panel
power switch with internal indication. Two mains supply variants shall
be available: 230 V or 115 V. Mains supply shall be connected via a
detachable IEC cable.
The mixing amplier shall be the Cloud 36/50; the optional remote
control plates shall be the Cloud RL-1 Series (music level only) and the
Cloud RSL-6 Series (music level and source selection). The optional
70/100 V transformer module shall be the Cloud CL-3120.
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