Formula Sound ZMR - 243 Technisch handboek - Pagina 3

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INSTALLATION

Installation of the ZM-243 should be carried out by experienced engineers wherever possible.

Good wiring practice should be observed when connecting any audio equipment. Good quality

connectors and screened cable should be used for all audio connections .

Twin screened cable should be used for all balanced lines particularly microphone connections.

THIS UNIT MUST BE EARTHED

Several internally selectable options are provided:- See Drg947-8

PRIORITY INPUT Stereo music input 1 may be selected to be a priority input by internal jumper

selection (see Drg 947-8). When a signal is present this input will take priority and mute any line

source currently selected. The position of an internal jumper selects this facility to be specific to

outputs (zones). Possible selections are 1, 1 & 2 or all. The control sensitivity and release time is

also adjustable. See Drg947-8

The front panel led indicates the presence of a priority signal. Microphone inputs are not affected by

this function.

Microphones 1 & 2 paging option. This function is enabled by the position of internal jumper links.

See Drg 947-8. This provision allows microphones to be remotely switched on and off. The switching

occurs after the microphone pre amp and generally provides a better solution than switching micro-

phones at source. Connecting pins 3 or 4 to 0VE pin 1 on the 4 pin Aux connector will enable micro-

phone channels 1 & 2 respectively. The front panel leds show the status

Note Microphone channels won't work if Mic status leds are not illuminated.

AVO. A voice override facility is provided for any or all outputs. This is internally selectable on the

individual output cards. Any microphone can be selected and will dim the music signals routed to that

output for announcements, talkover, etc.

Mono mode. Any output can be selected to operate in mono by the position of a jumper link on the

individual output cards. Either half of the front panel music volume controls can be bypassed by the

position of internal jumpers. This allows total flexibility over the control of music zones in either mono

or stereo. Remote volume control of either split mono or stereo zones is also possible by internal

jumper link selection. See Drg947-8

Remote music dim or mute. The remote music dim facility is triggered by connecting pin 2 to 0VE

pin 1 on the AUX connector. The attenuation level is fully adjustable by an internal pre-set. See

Drg 947-8

NOTE ON THE BEST USE OF GAIN

It is likely that more gain is available in the ZM-243 than you are likely to need. This is so that low

output sources can be used. For best performance always use the minimum amount of gain to

achieve the required volume. Never set the gain controls to maximum and hold gain on the front

panel controls. This will degrade the signal to noise performance and may cause overload distortion

(clipping). A good rule is never to have controls set lower than 3/4 of their full rotation for normal

operation.

230V 115V OPERATION

The mains transformer fitted to the ZMR-243 has split primary windings that allows 230V or 115V AC

operation. The unit may be ordered to operate on either voltage, if not specified 230V will be sup-

plied. Existing 230V units may be rewired to 115V operation and this must only be undertaken by a

technically competent engineer. Contact the factory for more details.

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