User manual AUDIO DESIGN JX360-4

[. . . ] Thank you for purchasing a JL Audio amplifier for your automotive sound system. Your amplifier has been designed and manufactured to exacting standards in order to ensure years of musical enjoyment in your vehicle. For maximum performance, we highly recommend that you have your new amplifier installed by an authorized JL Audio dealer. Your authorized dealer has the training, expertise and installation equipment to ensure optimum performance from this product. [. . . ] " position and feed the input of each bridged channel pair individually. For mono applications (where both bridged channel pairs will reproduce the same signal), you can select the "2 Ch. Make sure you observe correct polarity in making the "Hi-Level Input" connections. The connections for the "Hi-Level Inputs" plug wires are as follows from left to right on the plug: Channels 1&2 (FRONT) White: Left Positive (+) White/Black: Left Negative (­) Black: Common Ground (rarely used)* Gray: Right Positive (+) Gray/Black: Right Negative (­) Channels 3&4 (REAR or SUB) Green: Left Positive (+) Green/Black: Left Negative (­) Black: Common Ground (rarely used)* Purple: Right Positive (+) Purple/Black: Right Negative (­) *The only time you will use the Common Ground connections is with some older (pre-1980's) factory systems or head units that ground their speakers to chassis ground. To use these connections, ground the black wires on the plugs to chassis ground and only connect the Left and Right Positive plug wires to the factory radio outputs. "Input Mode" Switch If you wish to send four discrete channels of input into the JX360/4, simply use all four inputs (Channels 1 & 2 and Channels 3 & 4) and set the "Input Mode" switch to "4 Ch. The amplifier will turn on when +12V is present at its "Remote" input and turn off when +12V is switched off. If a source unit does not have a dedicated remote turn-on output, the amplifier's turn-on lead can be connected to +12V via a switch that derives power from an ignitionswitched circuit. To connect the remote turn-on wire to the amplifier, strip 1/2inch (12 mm) of insulation from the wire and insert it into the "Remote" receptacle on the power connector. Any bridged channel pair must be fed by both Input Channels corresponding to it (Left and Right). " located in each channel pair's control section can be used to match the source unit's output voltage to the input stage of each pair of amplifier channels for maximum clean output. Each of these filters can be configured independently into one of two filter types or defeated completely by way of the three-position "Filter Mode" switches: "HP" (High-Pass): Configures the filter to attenuate frequencies below the selected filter frequency at a rate of 12dB per octave. This is useful for connection of component speakers to one or both of the JX360/4's channel pairs in a bi-amplified system. Off": Defeats the filter completely, allowing the full range of frequencies present at the inputs to feed the amplifier. This is useful for systems utilizing outboard crossovers or requiring full-range reproduction from one or both of the JX360/4's channel pairs. The preamp output signal is not affected by any crossover filter selected (if the input signal is full-range, the preamp output will be full-range). Note: The signal level of the "Preouts" is always line-level (low voltage). Speaker outputs The JX360/4's speaker outputs are designed to accept 16 AWG - 8 AWG wire. Each pair of the JX360/4's channels are designed to deliver power into speaker loads equal to or greater than 2 ohms per channel when using a "stereo" configuration and speaker loads equal to or greater than 4 ohms per bridged pair of channels when using a "bridged" configuration. When a pair of JX360/4 channels are bridged, they will deliver 180W x 1 into a 4 ohm load or 140W x 1 into an 8 ohm load. Operating a pair of bridged channels into a load lower than 4 ohms is not recommended and will cause the amplifier to enter a protection mode. AmplIFIer status IndIcator lIgHts & protectIon cIrcuItrY There are two status indicator lights on the control panel of the amplifier. [. . . ] Using the procedure explained in the previous check item (after plugging the input cables back into the amplifier) test for output at the speaker outputs of the amplifier. Unless you enjoy test tones at high levels, it is a good idea to remove the speaker wires from the amplifier while doing this. This output level can vary greatly between amplifiers but it should not be in the millivolt range with the source unit at half volume. If you are reading sufficient voltage, check your speaker connections as explained below. [. . . ]