Power Amplifier Reference 7540a/7541a
POWER CONNECTIONS
WIRE-GAUGE CHART
The Reference amplifiers are capable of
delivering high power levels, and require a AmplifierMaximumMinimum
reliable connection to the vehicleOs electrical ModelCurrent DrawWire Gauge
system in order to perform optimally. See 7520a34A #8 AWG
Figure 1 for connection location. Please 7540a/7541a 85A #8 AWG
adhere to the following instructions carefully. These recommendations assume 7' � 10' wire
runs. If your installation differs markedly, you
GROUND CONNECTION
Connect the amplifierOs Ground (GND) terminalwill need to adjust the wire gauge accordingly.
to a solid point on the vehicleOs metal chassis,
as close to the amplifier as possible. Refer to the
chart below to determine minimum wire-gauge
size. Sand away any paint from this location; use
a star-type-lock washer to secure the connection.
SPEAKER CONNECTIONS
Refer to the application guides on the pages
POWER CONNECTION
that follow. Speaker connections should be
Connect a wire (see chart at right for appropriatemade using a minimum of 16-gauge wire.
gauge) directly to the vehicleOs positive battery
terminal, and install an appropriate fuse holder
HIGH-LEVEL INPUT CONNECTIONS
within 18" of the battery terminal. Do not
The 7540a/7541a amplifiers are
install the fuse at this time. Route the wire to
equipped with speaker-level inputs that allow
the amplifierOs location, and connect it to the you to add an amplifier to head units that do
amplifierOs positive (+12V) terminal. Be sure to
not have RCA line outputs. The speaker outputs
use appropriate grommets whenever routing
for the source unit should be connected to the
wires through the firewall or other sheet metal.
amplifier using the supplied connector (square
Failure to adequately protect the positive wire
four-wire plug). Remember to check for proper
from potential damage may result in a vehiclepolarity.
fire. When you are done routing and connecting
this wire to the battery and to the amplifier,
you may install the fuse at the battery. The
NOTE: When using the low-level or high-level
fuse value should be selected based on totalinputs, the AUX outputs can be used to pass a
amplifier-current draw; see chart at right.full-range line-level signal to another amplifier.
REMOTE CONNECTION
Figure 2. Speaker-level connector.
Connect the amplifierOs Remote (REMOTE)
terminal to the source unitOs Remote Turn-OnHIGH LEVEL
lead using a minimum of 18-gauge wire. If yourINPUT
source unit does not have a remote turn-on ��
connection, connect the amplifierOs (REMOTE)LR
++
terminal to the vehicleOs accessory circuit.
GRAY +� WHITE/BLACK
GRAY/BLACK �+ WHITE
R L
Speaker Wires
Figure 1.Terminal-connection end plate.(spliced)
Y If the amplifierOs fuse must be replaced, use
only the same type and rating as that of the
original. Do not substitute another kind.
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