Viking CPA-7B Istruzioni per l'installazione e il funzionamento

APPLICATION

It is possible to install long speaker runs

with the CPA-7B, M15W and PA-2A.

To minimize the loss of audio power in long

speaker runs, a transformer is required at

both the amplifier end and at the speaker

end of a long wire run. A minimum of two

transformers are always required (Radio

Shack part # 32-1031). The transformer at

the amplifier is referred to as the step-up transformer; the transformer

at the speaker is referred to as the step down transformer.

Long Speaker Runs

with the CPA-7B,

M15W and PA-2A

September 20, 2002

Minimize the Loss of Audio in

Long Speaker Runs

At the amplifier, connect the 8 OHM AUDIO OUTPUT to the 8 OHM

and COM taps of the step-up transformer’s secondary coil as shown.

See chart below for pin selections.

Model CPA-7B Model PA-2A

Model M15W

PAGING - LOUD RINGING

AMPLIFIER SYSTEM

VIKING

ELECTRONICS

HUDSON, WI 54016

VIKING©MODEL PA-2A

POWER 13.8V AC

12345678 910

NIGHT TRANSFER

SWITCH INPUT

PAG ING

HORN

600 OHM

AUDIO OUTPUT

TRUNK / PAGING

PORT

DRY CONTACT

CLOSURE INPUT

RINGING

VOLUME

MAX

MIN

1 - 3 4 - 6

RINGING LINES

1 2 3 4

TALK BATTERY

ALERT TONE

WARBLE / CHIME

PAGING

VOLUME

MAX

MIN

POWER JP1

Step-Up

Transformer

Step-Down

Transformer

Long Wire Run

Radio Shack Part # 32-1031

(or equivalent)

8 OHM

COM

A. Step Up Transformer

1. Connecting the Audio Output

Select the step-up tranformer’s primary coil tap, which closest

matches the amplifier’s rated wattage output and connect

these taps to the beginning of the long wire run (see the chart

to the right).

Model

CPA-7B

M15W

PA-2A

Wattage

Tap

2.5

2. Selecting the Coil Tap

Model

CPA-7B

M15W

PA-2A

Pins

1 & 2

1 & 4

2 & 3

Due to the dynamic nature of the product design, the information contained in this document is subject to change without notice. Viking Electronics, and its affiliates and/or

subsidiaries assume no responsibility for errors and omissions contained in this information. Revisions of this document or new editions of it may be issued to incorporate

such changes.

Fax Back Doc 856

Rev 7

Printed in the U.S.A.

If only one speaker is used, only one step-down transformer would be required.

Connect the speaker to the 8 OHM and COM taps of the step-down transformer’s

secondary coil as shown. Connect the same wattage taps (as those used on the

step-up transformer’s primary coil) of the step-down transformer’s primary coil to

the end of the long wire run.

1. Using Only One Speaker

In using two speakers located close together, connect the two speakers in paral-

lel and connect them to the 4 OHM and COM taps of the step-down tranformer’s

secondary coil as shown. Connect the same wattage taps (as those used on the

step-up transformer’s primary coil) of the step-down transformer’s primary coil to

the end of the long wire run.

2. Using Two Speakers (close together)

Multiple speakers (three or more) or speakers located far apart will require multiple step-down transformers.

Connect each speaker to the 8 OHM and COM of each step-down transformer’s secondary coil. To determine which

taps to use on each step-down transformer’s primary coil, divide the wattage of the tap used on the step-up tran-

former’s primary coil (2.5 for a PA-2A, 5 for a CPA-7B, 10 for a M15W) by the number of speakers and connect each

of the step-down transformer’s primary coils to the end of each long wire run.

Example (shown below): APA-2A driving four speakers located far apart from each other would equal 2.5 watts

divided by 4 which is 0.625 watts, so use the .625 WATT and COM taps on each step-down transformer’s primary

coil.

3. Multiple Speakers or Speakers Located Far Apart

PAGING - LOUD RINGING

AMPLIFIER SYSTEM

VIKING

ELECTRONICS

HUDSON, WI 54016

VIKING©MODEL PA-2A

POWER 13.8V AC

12345678 910

NIGHT TRANSFER

SWITCH INPUT

PAG ING

HORN

600 OHM

AUDIO OUTPUT

TRUNK / PAGING

PORT

DRY CONTACT

CLOSURE INPUT

RINGING

VOLUME

MAX

MIN

1 - 3 4 - 6

RINGING LINES

1 2 3 4

TALK BATTERY

ALERT TONE

WARBLE / CHIME

PAGING

VOLUME

MAX

MIN

POWER JP1

Step-Up

Transformer

Step-Down

Transformer

Long Wire Run 2.5 WATT

COM

2.5 WATT

COM

8 OHM

COM

8 OHM

COM

PAGING - LOUD RINGING

AMPLIFIER SYSTEM

VIKING

ELECTRONICS

HUDSON, WI 54016

VIKING©MODEL PA-2A

POWER 13.8V AC

12345678 910

NIGHT TRANSFER

SWITCH INPUT

PAG ING

HORN

600 OHM

AUDIO OUTPUT

TRUNK / PAGING

PORT

DRY CONTACT

CLOSURE INPUT

RINGING

VOLUME

MAX

MIN

1 - 3 4 - 6

RINGING LINES

1 2 3 4

TALK BATTERY

ALERT TONE

WARBLE / CHIME

PAGING

VOLUME

MAX

MIN

POWER JP1

Step-Up

Transformer

Step-Down

Transformer

Long Wire Run 2.5 WATT

COM

2.5 WATT

COM

8 OHM

COM

4 OHM

COM

PAGING - LOUD RINGING

AMPLIFIER SYSTEM

VIKING

ELECTRONICS

HUDSON, WI 54016

VIKING©MODEL PA-2A

POWER 13.8V AC

12345678910

NIGHT TRANSFER

SWITCH INPUT

PAG ING

HORN

600 OHM

AUDIO OUTPUT

TRUNK / PAGING

PORT

DRY CONTACT

CLOSURE INPUT

RINGING

VOLUME

MAX

MIN

1 - 3 4 - 6

RINGING LINES

1 2 3 4

TALK BATTERY

ALERT TONE

WARBLE / CHIME

PAGING

VOLUME

MAX

MIN

POWER JP1

Step-Up

Transformer

Long Wire Run 2.5 WATT

COM

8 OHM

COM

Step-Down

Transformer

.625 WATT

COM

8 OHM

COM

Step-Down

Transformer

.625 WATT

COM

8 OHM

COM

Step-Down

Transformer

.625 WATT

COM

8 OHM

COM

Step-Down

Transformer

.625 WATT

COM

8 OHM

COM

Long Wire Run

B. Step Down Transformers

The number of step-down tranformers and the taps used will depend on the number of speakers and the distances

between the speakers as shown below.

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