Xantech 760-00 User Manual

INSTALLATION INSTRUCTIONS

760-00

MATCH MAKER™ SPEAKER VOLUME CONTROL

The Model 760-00 is an in-wall mountable stereo speaker volume control with impedance matching
capability. From one to sixteen pairs of stereo speakers may be driven from one stereo power amplifier,
using an equal number of 760's. It maintains correct impedance matching between the amplifier and the
speakers by the use of instant setting S1, S4 and S8 jumpers on the control. This eliminates the need for
separate impedance matching components in multi-room installations.

OUTPUT

L+ L– R– R+

760-00

®

SPEAKER VOLUME

CONTROL

SYLMAR, CA

L+ L– R– R+

INPUT

Fig. 1 The 760-00

SPECIFICATIONS:

Type: 2 channel TRI-FI™ wound precision autoformers, with independent grounds.
Terminals: Eight plug-in type screw terminals.
Power Rating: 25 Watts continuous, 150 Watts peak.
Freq.Response: 20-20,000 Hz ± 1dB at 1 watt.
Attenuation: 11 steps at 3 to 6 dB per step - 35 dB max. (Max. CCW position is OFF).
S1 setting: 0 dB @ Max. CW (pass-through position).
S4 setting: 9 dB @ Max. CW.
S8 setting: 13 dB @ Max. CW.
Impedance:

S1 setting: Pass-through position. i.e. 8 Ohms on OUTPUT reflects 8 Ohms to INPUT
(Max. CW position).

S4 setting: 8 Ohms on OUTPUT reflects 32 Ohms to INPUT . Likewise, 4 Ohms on OUTPUT reflects

16 Ohms to INPUT (Max. CW position).

S8 setting: 8 Ohms on OUTPUT reflects 64 Ohms to INPUT. Likewise, 4 Ohms on OUTPUT reflects

32 Ohms to INPUT (Max. CW position).

Mounting: Fits most new construction junction boxes - uses single space.

Note: Will not fit certain retro-fit boxes, such as the Carlon 14 and 25 cu. inch series. Be
sure to check fit before choosing J-boxes!

Dimensions: 1-5/8" W x 2-7/8" H x 2-5/16" D

Speakers & Volume Controls

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1

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

S8

S4

INPUT

L+ L– R– R+

SPEAKER VOLUME

CONTROL

760-00

S1

S4S1

SYLMAR, CA

®

S8

L+ L– R– R+

OUTPUT

S8

S4

S1

Left Channel Jumper Positions

Left Channel Jumper

S4S1

S8

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.
Impedance

4 Ohms
8 Ohms

WHEN USING 4 OHM SPEAKERS

Min. Amp.
Impedance

4 Ohms
8 Ohms

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

S1 S1

S1 S4 S4 S4 S8 S8 S8 S8

Number of Speaker Pairs Used

1 2 3 4 5 6 7 8

S1 S4

S4 S4 S8 S8

Number of Speaker Pairs Used

S4 S4 S4 S4 S4 S4 S8 S8 S8 S8 S8 S8 S8 S8

Amplifiers & Preamplifiers

S4 S4 S8 S8 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

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