Cloud LM-2 Series User's Guide download pdf (Page 20)

Z4-8MK3 Installation and User Guide20

Music source

Music source for a zone may be controlled by applying various DC voltages of between 0 and +10 V to pin 3, the 0 V reference

being connected to pin 1. 0 V at pin 3 will select Line input 6 and between +7.5 and +9 V will select Line input 1. The other line

inputs will be selected with intermediate voltages. Taking pin 3 above +9 V will deselect all inputs, making the zone effectively

‘off’ for music.

The table below lists the DC voltages required at pin 3 to select each line input. The third column is the value of a resistor which

should be connected between pins 1 and 3 to permanently ‘force’ a zone to a particular line input.

INPUT DC VOLTAGE RESISTOR VALUE

OFF >+9.0 V

Line 1 +7.5 V 16k

Line 2 +6.0 V 11k

Line 3 +4.5 V 6k8

Line 4 +3.0 V 3k9

Line 5 +1.5 V 1k8

Line 6 0 V short-circuit

Note that there is an internal 15k “pull-up” resistor between pin 3 and the internal +15 V rail. If pin 3 is left “oating”, this pull-

up will cause ‘OFF’ to be selected. The output impedance of the control voltage source should be low enough to overcome the

effect of this resistor.

Fitting loudspeaker EQ cards

The Z4MK3 and Z8MK3 are compatible with various popular installed-sound loudspeakers; a single-channel loudspeaker

equalisation module may be tted to as many zone outputs as necessary to optimise the frequency response of the channel to

the loudspeaker type being used.

Please check the cloud website (www.cloud.co.uk) for makes and models of loudspeakers for which EQ cards are available.

To install equalisation modules, rst remove the top cover from the Z4MK3/Z8MK3 (six screws). The modules plug into the white

12-pin connectors labelled CON2 on the vertically-mounted sub-cards; there is one sub-card for each zone output, and the

modules can be plugged in without removing the sub-boards. Note the header connectors on the PCB have two notches on one

side only; these engage with lugs on the equalisation module’s mating connector to ensure correct orientation.

See the Appendix section “PCB jumper locations and settings” page 22 for further details. Replace the top cover with the

original screws after tting.

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Cloud LM-2 Series User's Guide Page 20