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36-50 Installation and User Guide V1.012

INSTALLATION

Hardware considerations

The 36-50 Mixing Amplier is built in a 2U-high 19” rack

mount enclosure. It is recommended that the 36-50 is installed

in a 19” rack wherever possible. The units are approx. 300 mm

deep, but at least 400 mm of rack depth should be available to

allow for rear connectors and cabling.

The 36-50 uses convection cooling and there are no thermal

considerations other than ensuring that the ventilation grilles

are not obstructed once the Mixing Amplier is installed. The

ventilation grilles are in the top and bottom panels, to the

right-hand side of the panels as viewed from the front. It is

recommended that 1U ventilation panels are tted in the rack

above and below the 36-50.

If the unit is to be used free-standing (i.e., not mounted in

a rack), the four feet supplied in the accessory pack should

be tted to the bottom of the unit to provide a satisfactory

airow. Attach these with the M4 x 12 pan-head screws

provided; four M4 tapped holes are clearly identiable in the

corners of the bottom panel.

Do not use any longer screws, as they may foul

internal components or wiring.

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

system and building layout. It is recommended that wherever

possible, the 36-50 should be mounted adjacent to as many

of the music sources (CD players, music servers, TV receiver

boxes, etc.) as practical.

When deciding the Mixing Amplier’s location, bear in mind

that access to it (particularly the rear panel) will probably be

required even if a full complement of remote controls is being

tted as part of the system, as certain adjustments can only

be made on the unit itself.

Power Supply

The European version of the 36-50 operates on standard 230V

AC mains; an alternative version is available which operates

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 112 VA (measured using pink noise, all

channels driven at 1/3-rated max. power into 4 ohms.)

Fuses and ratings

The only externally-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.

VERSION RATING FUSE TYPE

230 V 3.15 A 20 mm x 5 mm slo-blo T3.15AH

115 V 6.3 A 20 mm x 5 mm slo-blo T6.3AH

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.

Internally, two 20mm x 5mm fast-blow F4.0A fuses protect

each amplier channel (six in total). These are service

components, and should not require attention. Failure of any

of these fuses indicates a fault condition, which should be

immediately referred to a competent technician or authorised

service centre.

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 Mixing Amplier, 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 mixing section of the 36-50 is mono; the stereo line inputs

are summed internally. 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 36-50, a balancing transformer

should ideally be inserted 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 36-50 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 balancingtransformers

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

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