Output Power: 111W
RMS x 4 channels @ 4 ohms; ≤1% THD + N
(14.4V supply) 139W
RMS x 4 channels @ 2 ohms; ≤1% THD + N
278W RMS x 2 channels @ 4 ohms; ≤1% THD + N
WIRING
CLICK ON THE PICTURES TO ZOOM IN
POWER
AMPLIFIER
POWER CONNECTION
Connect a wire directly to the vehicle’s positive battery
terminal, and install an appropriate fuse holder within 18" of the battery
terminal. Do not install the fuse at this time. Route the wire to the
amplifier’s location, and connect it to the amplifier’s positive (+12V)
terminal. Be sure to use appropriate grommets whenever routing wires through
the firewall or other sheet metal. Failure
to adequately protect the positive wire from potential damage may result in a
vehicle 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 fuse value
should be selected based on total
amplifier-current draw; see chart at right.
GROUND CONNECTION
Connect the amplifier’s Ground (GND) terminal to a solid
point on the vehicle’s metal chassis, as close to the amplifier as possible.
Speaker connections should be made using a minimum of
16-gauge wire.
HIGH-LEVEL INPUT CONNECTIONS
The 7540a/7541a amplifiers are equipped with speaker-level
inputs that allow you to add an amplifier to head units that do not have RCA
line outputs. The speaker outputs for the source unit should be connected to
the amplifier using the supplied connector (square four-wire plug). Remember to
check for proper polarity.
When using the low-level or high-level inputs, the AUX
outputs can be used to pass a full-range line-level signal to another
amplifier.
The 7540a/7541a can be set up for stereo 4-channel, 3-channel
or bridged 2-channel operation, as shown in Figures 7 through 9.
NOTE: For simplicity, Figures 7 through 9 do not show power,
remote and input connections.
NOTE: Minimum speaker impedance for stereo operation is 2
ohms. Minimum speaker impedance for bridged operation is 4 ohms.
NOTE: "Bass Boost” only affects rear channels.
