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Z4-8MK3 Installation and User Guide10

INSTALLATION

Hardware Considerations

The Z4MK3 and Z8MK3 Zone Mixers are built in 3U-high 19”

rack mount enclosures. It is recommended that the Zone

Mixer is installed in a 19” rack wherever possible. The units

are approx. 160 mm deep, but 250 mm of rack depth should

be available to allow for rear connectors and cabling.

The Z4MK3 and Z8MK3 have low power consumption and

there are no thermal considerations other than ensuring that

the ventilation grilles are not obstructed once the mixer is

installed. The ventilation grilles are at the rear (immediately

above the AC input connector); in the bottom panel (behind

the AC mains switch), and in the left-hand side panel. Other

equipment may be installed above or below the Z4MK3/Z8MK3

within this constraint.

The choice of location will be dictated by the specics of

the system and building layout. It is recommended that

wherever possible, the Z4MK3/Z8MK3 should be mounted in

an equipment rack along with as many of the music sources

(CD players, music servers, TV receiver boxes, etc.) and audio

power ampliers (driving the zone loudspeakers) as practical.

When deciding the Zone Mixer’s location, bear in mind that

access to it will probably be required even if a full complement

of remote controls is being tted as part of the system, as

some adjustments can only be made on the mixer itself.

Power Supply

The European versions of the Z4MK3 and Z8MK3 operate on

standard 230 V AC mains; alternative versions are available

which operate on 115 V AC. An IEC mains cable with a plug

appropriate for each country is supplied with the European

unit. The unit’s power consumption is 20 VA (Z4MK3) or

28 VA (Z8MK3)

Fuses and ratings

The only user-accessible fuse is an AC mains fuse in the IEC

connector housing. Only replace a fuse with one of

exactly the same type. The table below gives the correct

fuse types.

MODEL VERSION RATING FUSE TYPE

Z4MK3

230 V 100 mA 20 mm x 5 mm slo-blo T100mA

115 V 200 mA 20 mm x 5 mm slo-blo T200mA

Z8MK3

230V 125 mA 20 mm x 5 mm slo-blo T125mA

115V 250 mA 20 mm x 5 mm slo-blo T250mA

The fuseholder may be accessed by prising the slide below the

connector open, using a small screwdriver. The holder has an

extra cavity for storing a spare fuse; note that the “active” fuse

is that in the inner cavity.

System Connections

Music Sources

Connect the system’s various music sources to LINE 1 to

LINE 6. All line inputs offer unbalanced connection for stereo

sources on a pair of standard RCA jacks (phono sockets).

The sensitivity range available should allow most standard

items of audio equipment such as computers/tablets, music

servers and media receivers, etc., to operate at a satisfactory

level. Most equipment of this type will have stereo unbalanced

outputs, and as long as the source equipment is adjacent to

the Zone Mixer, normal phono-phono (or 3.5 mm jack-to-

phono) leads can be used. Always avoid using pre-made leads

of an unnecessary length.

Mono and stereo sources:

The Z4MK3 and Z8MK3 are mono mixers; the stereo line

inputs are summed internally to mono. Stereo sources should

be connected in a normal stereo conguration, using both L

and R inputs. If connecting a mono source with only a single

output, it may be connected to either the left or the right

input.

Balanced sources:

If it is necessary to connect an item of source equipment with

a balanced output to the Zone Mixer, a balancing transformer

should ideally be connected between the source and the

unbalanced input. Suitable audio transformers, which should

have a ratio of 1:1, are readily available from major audio

component suppliers. The transformer(s) should be mounted

as close to the Zone Mixer as practical, and housed in a

screened enclosure if they are not individually screened. The

preferred connection method is shown below.

LEFT

SCN

Unbalanced

inputs

SCN

LEFT

SCN

Audio balancing transformers

RIGHT

SCN

Unbalanced

inputs

SCN

RIGHT

SCN

pin1ground

pin2hot

pin3cold

Balanced outputs (XLRs):

If transformers are not available, a balanced source may feed

an unbalanced input directly as long as care is taken over how

the connections are made. A variety of design techniques are

in use to implement balanced outputs in audio equipment,

and some designs require different wiring protocols to others.

Installers are advised to check the manuals with each item

for guidance on how the outputs should be connected to an

unbalanced input.

However, the following wiring methods will work in a large

number of cases. If hum or other distortion is found to result,

try disconnecting the ‘cold’ leg of the balanced output (pin 3

on XLRs).

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