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 + NWIRING
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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.
