INFINITY 7540A
Manual de Servicio

Power Amplifier

Reference 7540a/7541a

POWER CONNECTIONS
The Reference amplifiers are capable of delivering high power levels, and require a reliable connection to the vehicle�s electrical system in order to perform optimally. See Figure 1 for connection location. Please adhere to the following instructions carefully. 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. 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. POWER CONNECTION Connect a wire (see chart at right for appropriate gauge) 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. REMOTE CONNECTION Connect the amplifier�s Remote (REMOTE) terminal to the source unit�s Remote Turn-On lead using a minimum of 18-gauge wire. If your source unit does not have a remote turn-on connection, connect the amplifier�s (REMOTE) terminal to the vehicle�s accessory circuit. WIRE-GAUGE CHART Amplifier Maximum Minimum Model Current Draw Wire Gauge 7520a 34A #8 AWG 7540a/7541a 85A #8 AWG These recommendations assume 7' � 10' wire runs. If your installation differs markedly, you will need to adjust the wire gauge accordingly.

SPEAKER CONNECTIONS Refer to the application guides on the pages that follow. 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. NOTE: 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. Figure 2. Speaker-level connector.
HIGH LEVEL INPUT � L + � R + GRAY + GRAY/BLACK � � WHITE/BLACK + WHITE

Figure 1.Terminal-connection end plate.

RL Speaker Wires (spliced)

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