SETTING THE IMPEDANCE MATCHING JUMPERS

Fig. 2 shows the location of the pins and the jumper locations on the pins for the three impedance multiplier positions. To set the jumpers correctly, refer to Fig. 2 and the charts and procedures that follow.

Right Channel Jumper

Right Channel Jumper Positions

I N P U T

S1

S4

S8

L+ L– R– R+

 

 

 

VOLUME

SYLMAR, CA

 

 

 

SPEAKER CONTROL

 

 

 

 

00

®

 

 

 

760-

 

 

 

 

R+ –R –L L+

S1

S4

S8

T U P T U O

 

 

S1

 

 

 

S4

 

 

 

 

S8

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

S1

S4

S8

Left Channel Jumper Positions

Left Channel Jumper

Fig. 2 Jumper Placement For Impedance Matching

The jumpers are located under the one side of the autoformers as shown in Fig.2. Their proper placement depends on the number of 760's and speakers used in the total installation. To set them for the best impedance matching condition, refer to the following charts and procedures:

WHEN USING 8 OHM SPEAKERS

Min. Amp.

 

 

 

 

Number of Speaker Pairs Used

 

 

 

 

Impedance

 

1

2

3

 

4

5

 

6

 

7

 

8

 

9

10

11

12

13

14

15

16

 

 

 

 

 

 

 

4 Ohms

S1

S1

S4

 

S4

S4

 

S4

 

S4

 

S4

 

S8

S8

S8

S8

S8

S8

S8

S8

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

8 Ohms

S1

S4

S4

S4

S8

S8

S8

S8

 

 

 

 

 

 

 

 

 

WHEN USING 4 OHM SPEAKERS

 

 

 

 

 

 

 

 

Min. Amp.

Number of Speaker Pairs Used

 

 

 

 

 

 

 

 

Impedance

1

2

3

 

4

5

 

6

 

7

 

8

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4 Ohms

S1

S4

S4

S4

S8

S8

S8

S8

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

8 Ohms

S4

S4

S8

S8

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Procedure for all 4 Ohm or all 8 Ohm Speakers:

1.Determine the rated speaker impedance (refer to the manufacturer's specifications - it must be the same for all speakers used in the system).

2.Determine the total number of stereo speaker pairs used in the installation.

3.Determine the minimum safe amplifier operating load impedance (refer to the manufacturer's specifications).

4.Find the correct jumper position from the above charts.

5.Place the jumpers in the same position on each 760 used in the system.

Example 1:

Three pairs of 4 Ohm wall speakers are to be used with three 760's in a 3-room system, all driven by one amplifier rated for 8 Ohms minimum safe operating load impedance.

1.Refer to the chart "WHEN USING 4OHM SPEAKERS".

2.Locate the number 3 in the top row.

2

760-00

Page 2
Image 2
Xantech 760-00 installation instructions Setting the Impedance Matching Jumpers, Example

760-00 specifications

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