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+ | |||||
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VOLUME | SYLMAR, CA |
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SPEAKER CONTROL |
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760- |
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R+ | S1 | S4 | S8 | ||
T U P T U O | |||||
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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. |
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Impedance |
| 1 | 2 | 3 |
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| 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 |
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4 Ohms | S1 | S1 | S4 |
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| S8 | S8 | S8 | S8 | S8 | S8 | S8 | S8 | |
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8 Ohms | S1 | S4 | S4 | S4 | S8 | S8 | S8 | S8 |
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WHEN USING 4 OHM SPEAKERS |
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Min. Amp. | Number of Speaker Pairs Used |
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Impedance | 1 | 2 | 3 |
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4 Ohms | S1 | S4 | S4 | S4 | S8 | S8 | S8 | S8 |
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8 Ohms | S4 | S4 | S8 | S8 |
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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
1.Refer to the chart "WHEN USING 4OHM SPEAKERS".
2.Locate the number 3 in the top row.
2
