Wiring Instructions (Refer to Figure 3)
1. Strip about 1/4” of insulation from the ends of all wires to be connected
to the AB-1.2. If necessary, twist the exposed conductors to ensure that
no loose strands exist.
2. Connect the leads from the “A” amplifier to the Amp “A” Input snap
connector, with the left (L+ and L-) and right (R+ and R-) wires inserted
in the appropriately marked openings in the connector. Snap the lever
down on the connector, making sure that the exposed bare wire is
engaged.
3. Connect the leads from the “B” Amplifier to the Amp “B” Input snap
connector in the same manner as described in step 2.
SPEAKER OUT
AMP B INPUT
AMP A INPUT
RUSSOUND INC
AB-1.2
ATTENUATOR OUT
Amp/Receiver “B”
Speakers
AB-1.2 Source Selector
Speaker Cable
Speaker Cable
Speaker Cable
Amp/Receiver “A”
IN
OUT
ALTx Volume Control
Speaker Cable
NOTE:
To avoid problems with certain types of amplifiers employing bridging
outputs or isolated grounds, the L and R (-) grounds are separate. If a 3
wire system or common ground amplifier is used, the L- and the R- inputs
of the ACP-1DU should be jumpered together. If one channel ground is
open, that channel will appear to drop out when the volume control is
rotated. The L- and the R- connections are placed adjacent to enable this
type of connection, and to reduce short circuits.
4. The ACP-1DU comes with the AB-1.2 Speaker Out connector pre-
wired to the volume control Input connector.
5. Connect the left speaker L+ and L- wire leads to the corresponding
marked openings in the volume control’s Output connector. Connect
the right speaker’s leads in the same manner, observing channel and
polarity identification.
6. Install the completed assembly in the junction box. Insert carefully to
avoid excessive strain on the plugs. If necessary, pre-dress the wires
for easier mounting.
CAUTION: Do not reverse the input and output connections.
CONSIDERATIONS
1. Make sure that your amplifier has adequate wattage for the number of speak-
ers. Watts per channel divided by the number of pairs should equal or exceed
the individual speaker’s minimum wattage requirements.
2. You must use an UltraMatch™ volume control for each pair of speakers.
3. Every jumper setting must be set on the same setting throughout the system.
4. A minimum speaker load of 4 ohms can be connected to the output of each
UltraMatch™ volume control.
EZB CONNECTING BLOCKS
The EZB-1-SC and EZB-2-SC connecting blocks are Russound accessories that
simplify connections of multiple volume controls and speaker pairs. The EZB-1SC is
a neat, compact wiring device capable of connecting four volume controls to an
amplifier's outputs. The EZB-2SC expands the EZB-1SC to another 4 volume con-
trols. Multiple EZB-2SC's can be used to expand the system to sixteen volume
controls.
8X
4X
1X-2X
2X-4X-8X
1X
8X
4X
1X-2X
2X-4X-8X
1X
8X
4X
1X-2X
2X-4X-8X
1X
8X
4X
1X-2X
2X-4X-8X
1X
8X
4X
1X-2X
2X-4X-8X
1X
8X
4X
1X-2X
2X-4X-8X
1X
X1
X2
X4
8X
4X
1X-2X
2X-4X-8X
1X
8X
4X
1X-2X
2X-4X-8X
1X
X8
Jumper Settings for Impedance Matching (continued)
3. Determine the impedance for each pair of speakers by referring to its
manual.
4. Determine the total number of 4 ohm pairs of speakers. (rows on charts)
5. Determine the total number of 8 ohm pairs of speakers. (columns on charts)
6. Follow the appropriate row and column to determine jumper settings.
7. Set the jumpers to the appropriate X setting as shown in Figure 2.
Fig. 2 Jumper Settings On Circuit Boards
Fig. 3 ACP-1DU Connections with Speakers and Amplifiers
