Russound ACP-1DU 1 User manual

5 Forbes Rd. Newmarket, NH 03857, USA
Tel [phone] • Fax [phone]
e-mail: [email protected]
ACP-1DU
Instruction Manual
Specifications
• Power Rating: 126W, 42W RMS, continuous per channel
• Frequency
Response: 20 Hz to 20 kHz
• Dimensions: 2-5/8” W x 1-3/4” H x 2-5/8” D
(fits standard double-gang junction box)
• Connectors: Removable modular snap type
Accepts up to 14 gauge wire
• Attenuation: 12 steps, including “off”
Total attenuation of 43dB
Warranty
The Russound ACP-1DU is fully guaranteed for a limited lifetime warranty from the
date of original purchase against all defects in materials and workmanship. During
this period, Russound will replace any defective parts without charge for either
parts or labor. Contact Russound for a replacement. Proof of purchase may be
required. For this warranty to apply, the unit must be installed and used according
to its written instructions. Accidental damage and shipping damage are not consid-
ered defects under the terms of the warranty. Russound assumes no responsibility
for defects resulting from abuse or servicing performed by an agency or person not
specifically authorized in writing by Russound. Damage to or destruction of compo-
nents due to improper use voids the warranty. In these cases, the repair will be
made at the owner’s expense.
Russound sells product only through authorized Dealers and Distributors to
ensure that customers obtain proper support and service. Any Russound prod-
uct purchased from an unauthorized dealer or other source, including retailers,
mail order sellers and online sellers will not be honored or serviced under exist-
ing Russound warranty policy. Any sale of products by an unauthorized source
or other manner not authorized by Russound shall void the warranty on the
applicable product.
Wall Mount Stereo Volume Control
with A / B Switch
Product Overview
The Russound ACP-1DU is a wall-mount UltraMatchTM stereo volume control
combined with an AB-1.2 A / B source selector switch. This product allows you
local selection and volume control of one of two amplifiers (sources) through a
single pair of speakers. The ACP-1DU is ideal for residential or commercial appli-
cation, and can be used with 4 to 8 ohm speakers.
The AB-1.2 A / B switch is equipped with removable modular snap connectors
for ease of installation. These connectors may be pre-wired separately and sim-
ply plugged in when the ACP-1DU is installed in the wall box. The ACP-1DU
uses a Decora® style double-gang wall plate.
UltraMatch™
The UltraMatch™ Volume Control connects between the speaker outputs of an
amplifier or receiver and a pair of speakers. The UltraMatch™ volume control pro-
vides a method of matching the minimum output impedance of the amplifier or
receiver, in addition to adjusting volume. The volume is adjusted by attenuating
the amplifier signal output of the control to the speakers.
Jumper Settings for Impedance Matching
By determining the drive capability of the amplifier with a few simple calcula-
tions, the number of speakers the system can safely operate can be determined
as well.
The jumper must be set in a position that correctly multiplies the impedance of
the system to a level that is equal to or greater than the impedance of the ampli-
fier. The 1X setting allows the volume control to be used as a standard control.
The 2X, 4X, and 8X settings allow it to be used as an UltraMatch™ control. The
jumper setting can be determined using the following simple steps:
1. Determine the amplifier's minimum impedance. The amplifier's minimum
impedance is usually found following Wattage and Frequency Response in
the amplifier's specification page of the manual. It may also be listed on the
back panel of the amplifier near the speaker terminals. AC impedance is mea-
sured in ohms.
2. Identify the correct impedance-matching chart according to the amplifier's
minimum impedance. There are two impedance matching charts shown in
Figure 1, one for 8-ohm (also 6-ohm stable) amplifiers and one for 4-ohm
amplifiers. Choose the chart that describes your amplifier.
012345678910111213141516
0 - 1X 1X 2X 2X 4X 4X 4X 4X 8X 8X 8X 8X 8X 8X 8X 8X
1 1X2X2X4X4X4X4X8X8X8X8X8X8X8X8X
2 2X4X4X4X4X8X8X8X8X8X8X8X8X
3 4X4X4X8X8X8X8X8X8X8X8X
4 4X8X8X8X8X8X8X8X8X
5 8X8X8X8X8X8X8X
6 8X8X8X8X8X
7 8X8X8X
8 8X
Impedance Matching For 4 Ohm Amplifiers
4 Ohm Pairs
8 Ohm Pairs
Fig. 1 Impedance Matching Charts For UltraMatch™
012345678
0 - 1X 2X 4X 4X 8X 8X 8X 8X
1 2X4X4X8X 8X 8X 8X
2 4X8X8X8X8X
3 8X8X8X
48X
Impedance Matching For 8 Ohm Amplifiers
8 Ohm Pairs
4 Ohm Pairs
Example: The table on the bottom right shows an 8-ohm minimum impedance
amplifier with 1 pair of 4-ohm speakers and 3 pair of 8-ohm speakers. The chart
indicates the jumper setting should be set at 8X.
28-0029 Rev. 1

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