Cloud 50 Uživatelský manuál stáhnout pdf (Strana 5)

Issue_2.0 E&OE

Architect’s and Engineer’s Specication

The mixing amplier shall have four mono output channels; each

channel shall be capable of driving 50 watts into a 4 ohm load.

An optional module shall be available to allow any or all channels of

the mixing amplier to drive 70 V or 100 V-line loudspeaker distribution

systems. The module shall be retrottable and be contained within the

chassis of the mixing amplier. It shall be possible to congure the

four zones in two pairs, or one pair plus two independent zones,

so that two zone outputs are controlled by a single set of controls

and process the same programme selection. Two of the zones shall

be equipped with unbalanced line level outputs suitable for driving

external ampliers; use of these outputs shall not interrupt the unit’s

normal operation.

The mixing amplier shall be equipped with six unbalanced stereo

music inputs on rear panel phono sockets (RCA jacks) and two

electronically balanced microphone inputs on multi-pin screwterminal

connectors. One microphone input shall be congured to operate

with paging microphones. Each music input shall have an input gain trim

control with a range of 20 dB; two-band equalisation adjustment shall

be provided for each microphone input; these controls shall not be

user-accessible. Phantom power shall be available at the microphone

inputs when selected by internal jumper. A gain control of the preset

type shall be provided for each microphone input; these shall have a

range of 40 dB, and not be accessible to the user.

Each of the output zones shall have dedicated front panel controls

for selection of music source and music level and the levels of

each microphone input. The front panel shall also have controls of

the preset type for two-band equalisation adjustment in each zone.

A tamper-proof cover shall be provided to make the equalisation

controls inaccessible in normal operation.

A control input shall be provided to activate one microphone

input by external contact closure, and route its signal to any or all

outputs. It shall be possible to congure the mixing amplier such

that this microphone signal automatically reduces the music signal

by approximately 30 dB while it is present. It shall also be possible

to congure the mixing amplier so that i) one line input will

automatically override all others in one zone, even if unselected; it

shall be possible to set the time over which the selected source is

restored after the override input ceases to one of three values of

up to 12 seconds; ii) one microphone input shall have priority of the

other should both be active simultaneously.

Optional remote control panels shall be available to permit control

of i) music level in any zone; ii) music source selection and music

level in any zone; it shall be possible to retrot these to the mixing

amplier at any time. The remote control panels 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 settings which are not accesible to the user. 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 congurable to respond to either

a short or open external circuit.

One zone of the mixing amplier shall be equipped with a multifunction

control connector. A range of external active input plates shall be

available which may be wired to this connector, enabling external mic

or line level signals to be routed to the zone from a remote location.

The multi-pin connector shall permit the connection of a balanced

audio source, and also provide DC power for the remote plates.

It shall be possible to congure the mixing amplier so that a signal at

this input has priority over the other microphone inputs.

The mixing amplier 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 amplier 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 amplier shall be the Cloud 46-50; the optional remote

control panels shall be the Cloud RL-1 (music level only) and the

Cloud RSL-6 (music level and source selection) and the optional

remote input plates shall be the Cloud LM-1 (line and microphone

level inputs plus control of music source selection) and the Cloud

DM-1 (two microphone inputs). The optional internal 70/100 V

transformer module shall be the Cloud CL-4160.

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