Cloud Electronics CXL-46T User Manual

CXL-46T

100/70 V Transformer

Installation Instructions

Important Safety Notes

It should be recognised that 100 V-line or 70 V-line speaker systems have the
potential to deliver an electric shock. Install the CXL-46T only in accordance
with these instructions.

In all cases, the external wiring and associated speakers will need to comply
with local electrical regulations for AC voltages up to 100 Vrms (141 Vpeak).

Do not expose the transformer to rain or moisture.

The transformer module must be installed in a safe manner.

Cloud Electronics Ltd. accept no responsibility for hazardous installations.

CXL-46T Installation Instructions v1.0 1

INTRODUCTION

The CXL-46T is an optional transformer for the 46-120 and 46-120MEDIA Multi-Zone Mixer Ampliers, to permit the Mixer
Ampliers to directly drive 100 V-line or 70 V-line loudspeaker systems. The transformer is rated at 120 W output, and is mounted
internally. Up to four CXL-46Ts (one per output channel) may be tted to a 46-120 or 46-120MEDIA. The outputs are available on

the 8-pin 5 mm-pitch screw-terminal SPEAKER OUTPUTS connector on the host unit’s rear panel.

46-120 / 46-120MEDIA Rear Panel

Speaker Outputs

NOTE: unlike other Cloud multi-channel ampliers, all 46-120 models use a single output connector for both low impedance and

70/100 V-line operation. Thus it is NOT possible for any channel of a 46-120 to drive both low impedance speakers and
70/100 V-line systems simultaneously. The check boxes below the connector should be used to indicate the standard each output is
set for.

FITTING THE CXL-46T TRANSFORMER

The CXL-46T transformer is a toroidal type, and is supplied pre-terminated with 2-pin and 3-pin connectors as shown:

MAUVE

SECONDARY

WINDING

CONNECTOR

(female)

WHITE

BLUE

PRIMARY
WINDING

CONNECTOR

(male)

RED

BLACK

CXL-46T Installation Instructions v1.02

Red

White

Purple

-

(0V)

+

100 V

To 100/70 V-line

70 V

Black

Pri. Sec.

CXL-46T

Blue

COM

speaker system

From amplifier

output (Lo-Z)

Each transformer is also supplied with an M5 hex-head screw, locknut and washer.

To t convert one channel of a 46-120 to 70/100 V-line operation, proceed as follows:

1. Disconnect the 46-120 from the mains.

2. Remove the top cover (10 screws) and orient the unit with the rear panel towards you.

3. Mount the CXL-46T transformer on the right-hand side of the 46-120 chassis, using one of the holes in the side of the chassis
and the M5 screw, washer and locknut supplied with each transformer. The bolt passes through the centre of the toroid, and

the screw head should be on the outside of the chassis. If tting fewer than four CXL-46Ts, any of the xing positions may be
used. Orient the transformers so that the ying leads face the rear of the chassis.

4. For the zone being converted to 70/100 V-line operation, unplug the relevant 4-pin female connector from its ZONE O/P
socket on the main PCB immediately behind the rear panel SPEAKER OUTPUTS connector. There are four of these (one
per zone): CON38 (Zone 1), CON39 (Zone 2), CON40 (Zone 3) and CON41 (Zone 4) - see diagram below. Note that
CON38 is orientated at 180° relative to the other three.

CON38

PLUG TRANSFORMER

SECONDARY IN HERE FOR

70 V OPERATION

PLUG TRANSFORMER

SECONDARY IN HERE FOR

100 V OPERATION

CON44CON43

SPEAKER OUTPUTS

connector

CON41CON40CON39

ZONE 1 O/P ZONE 4 O/PZONE 3 O/PZONE 2 O/P

THESE CONNECTORS ARE

ALSO USED FOR LO-Z

OPERATION

CON46CON45

REMOTE POWER DOWN

connector

CXL-46T Installation Instructions v1.0 3

The wires on these connectors are colour-coded to aid zone identication:

ZONE OUTPUT WIRING

1

2

3

4

Red & Black
Orange & Black
Yellow & Black
Purple & Black

5. Identify the transformer’s primary winding – this is the red/black ying lead tted with a male connector. Plug the female
connector removed in Step 4 into this. Note the pin and latch orientation – the connectors will only mate one way.

6. If conguring the zone output for 100 V-line operation, plug the transformer’s secondary winding – the other ying lead
(blue/mauve/white) - into the second ZONE O/P socket; this will be the one paired with the socket unplugged in Step 4,
and closer to the SPEAKER OUTPUTS connector. These are: CON43 (Zone 1), CON44 (Zone 2), CON45 (Zone 3) and
CON46 (Zone 4). Note that CON43 is orientated at 180° relative to the other three. See diagram on previous page.

7. If conguring the zone output for 70 V-line operation, plug the transformer’s other ying lead (blue/mauve/white) into the
ZONE O/P connector vacated in Step 4.

8. For each zone being converted to 70/100 V-line operation, enable the channel’s 65 Hz hi-pass lter by moving the appropriate
jumper from OFF to ON: these are J3 (Zone 1), J4 (Zone 2), J8 (Zone 3) and J9 (Zone 4). This is important, as low frequency

signals at high level can saturate the transformer cores, causing unpleasant distortion and possibly activating the amplier’s

limiter circuitry. See diagram below for location of PCB jumpers.

9. If converting further Zone outputs to 70/100 V-line operation, repeat Steps 3 to 8 for each output.

10. Replace the cover, using the original screws.

11. Mark the checkboxes below the SPEAKER OUTPUTS connector with a felt-tip pen to indicate the mode of operation for
each channel.

J9

J4

J8

J3

LINE INPUT SUB-BOARD

CON43

46-120 MAIN PCB – REAR VIEW

SIMPIFIED VIEW – ONLY PRIMARY

COMPONENTS SHOWN

CON38

CON44

CON39

CON45

CON40

CON41

CON46

CXL-46T Installation Instructions v1.04

Cloud Electronics Limited

140 Staniforth Road

Shefeld S9 3HF

England

Tel: [phone]

Fax: [phone]

email: [e-mail]

web: www.cloud.co.uk

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1200 Iron Horse Drive, Unit A

Park City

Utah 84060.

United States of America.

Toll Free: 0855 810 0161

email: [e-mail]

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