Wiring and Connections
40
Metreau Keypads Instruction Manual
Two-Wire Configurations – Keypad for Control Only
In some retrofit configurations it is not feasible or possible to re-route the speaker cable through the keypad. In cases such as this,
it is possible to run a separate cable pair (CAT-3 / CAT-5 / Twisted Pair) cable from the Matrix Controller to the keypad for control
purposes. When using CAT3/CAT5 over long runs, it is recommended to "double-up" the control wires (only 2 conductors are
required, and there are 4-8 wires available). FIG. 34 shows the connections of the control signal path to the keypad, and the
speaker connections to the Matrix Controller.
Split Zone / Analog Volume Control
In cases of split zones where more than one set of speakers are driven from the same keypad, it is sometimes desirable to place a
volume control in the split zone. FIG. 35 shows the connections to a remote zone, and “Autoformer” volume control device.
Ensure the impedance setting doesn't fall below 4 Ohms.
If you are installing 2 pairs of speakers in a zone and the speakers are 8 Ohms, it is not necessary to use an impedance
matching autoformer type volume control. A standard stereo volume control will perform properly. The impedance will be
approximately 4 Ohms.
If you are using an impedance matching volume control with 2 pairs of speakers set the impedance matching to the 2X
setting.
NOTE:
It is not recommended to install more than 2 pair of speakers per zone.
FIG. 34
2 Wire Configurations - keypad for Control Only
FIG. 35
Split Zone / Analog Volume control (Option 2) one keypad
Metreau keypad
+
-
+
-
Left
Right
Cat5/Cat3/Twisted Pair
L D G R
Zone Output Connector
(on Matrix Controller)
Right
Left
Volume Control
Metreau keypad
Right
Left
L D G R
Zone Output Connector
(on Matrix Controller)
