JL Audio XD700/5 Manual: Remote Level Control, Speaker Outputs & Bridging Considerations

REMOTE LEVEL CONTROL (OPTIONAL)

With the addition of the optional Remote Level Control (HD-RLC), you can control the volume of the subwoofer channel (Subwoofer Level) or of the entire XD700/5 from the front of the vehicle (Master Volume).

The HD-RLC connects to the jack labeled “Remote Level Control” on the Connection Panel of the amplifier using a standard telephone cable (supplied with the HD-RLC). If desired, multiple XD (and HD) amplifiers can be controlled from a single HD-RLC controller using a simple phone line “splitter” and multiple phone cables.

When connected to the amplifier, the HD-RLC operates as follows. At full counter- clockwise rotation, the audio of the selected channels will mute completely. At full clockwise rotation the level will be the same as if the HD-RLC was not connected at all. In other words, it operates strictly as a level attenuator.

“Remote Level Mode” Switch: This switch allows you to assign the operation of the HD-RLC to the entire amplifier or only the subwoofer channel. In the “All” position, the HD-RLC knob will affect all channels equally. In the “Sub Ch.” position, only the level of the subwoofer channel will be affected by the HD-RLC knob.

SPEAKER OUTPUTS

The XD700/5’s speaker outputs are designed to accept 16 AWG - 8 AWG wire. To connect the speaker wires to the amplifier, first back out the set screws on the top of the terminal block, using the supplied 2.5 mm hex wrench. Strip 1/2 inch (12 mm) of insulation from the end of each wire and insert the bare wire into the terminal block, seating it firmly so that no bare wire is exposed. While holding the wire in place, tighten the set screw firmly, taking care not to strip the head of the screw.

Each pair of the XD700/5’s main channels are designed to deliver power into speaker loads equal to or greater than 2 ohms when using a “stereo” configuration and speaker loads equal to or greater than 4 ohms when using a “bridged” configuration. The subwoofer channel is designed to deliver power into subwoofer loads equal to or greater than 2 ohms.

Speaker loads below 2 ohms nominal per channel (or 4 ohms bridged) are not recommended and may cause the amplifier to initiate a protection mode which reduces power output.

BRIDGING CONSIDERATIONS Bridging is the practice of combining the

output of two amplifier channels to drive a single load. When bridged, each channel produces signals of equal magnitude, but opposite polarity. The combined output of the two channels provides twice the output voltage available from a single channel. The XD700/5 has been designed for bridging of its main channel pairs without the need for input inversion adaptors.

To bridge a pair of main channels, use the

“Left +” and “Right –” speaker connectors only (the “Left –” and “Right +” remain unused). Each bridged channel pair will deliver optimum power into a 4 ohm load.