User manual JBL P-4020

[. . . ] Included in the Universal Interface circuit is Common SenseTM turn-on. Common Sense turn-on senses the common-mode voltage present on the speaker outputs of factory and aftermarket radios, turning on the amplifier without a separate remote wire. All Power Series amplifiers feature built-in electronic crossovers and pre-amp outputs for easy system expansion without requiring outboard processors. Amplifier Features · 4-, 3- or 2-channel operation (P-4040) 2- or 1-channel operation (P-4020) · Simultaneous stereo and mono operation · Built-in 12dB/oct electronic crossover · Balanced differential input · Pre-amp outputs (filtered on P-4040) · Oversized Floating Rail Mosfet Power Supply · Universal Interface · Common Sense turn-on · Variable input sensitivity (250mV­4V) · Fully complementary, direct coupled discrete power amplifier circuitry · Gold-plated power, input and output connectors · 2-Ohm stable (stereo) · JBL badge lights when amp is operating and flashes when protection circuit is activated · Made in USA About This Manual To attain maximum amplifier performance, we encourage you to read the remaining pages before installing and operating your new JBL Power Series amplifier. Especially review the Applications section for ideas on designing and expanding your system. [. . . ] At the chosen site, use the amplifier as a mounting template and mark the locations of the four mounting holes. Drill a small pilot hole at each marked location. Mount the amplifier and securely tighten the mounting screws. 2. Locate the 3-connection barrier strip labeled +Batt, Rem and Gnd. Connect a black wire (at least 12G) to the Gnd terminal and connect the other end to the nearest bare-metal chassis component. Then, connect a red wire (at least 12G) from the vehicle's +12-volt battery terminal to the +Batt terminal on the barrier strip. Finally, connect a blue wire (16G) to the Rem terminal on the barrier strip and connect the other end to the Rem output of the source unit. (If you are using speaker-level inputs and speaker-level outputs from the source, disregard the previous instruction regarding the Rem terminal. ) FREQUENCY Crossover 75Hz 100Hz 125Hz 150Hz 175Hz 200Hz INDUCTOR 6dB/oct. LP (4 ohm) 8. 0mH 6. 4mH 5. 0mH 4. 2mH 3. 6mH 3. 2mH CAPACITOR 6dB/oct. HP (4 ohm) 530µF 400µF 318µF 265µF 227µF 198µF 2. If you are connecting the amplifier to a factory-installed source unit, or to a source unit that only has speaker-level outputs, connect the speaker outputs of the source to the speaker inputs on the amp, observing the following color codes: Front Left+: White Front Left­: White with black stripe Front Right+: Gray Front Right­: Gray with black stripe Rear Left+: Green Rear Left­: Green with black stripe Rear Right+: Purple Rear Right­: Purple with black stripe (Note: When using the Universal Interface speaker-level inputs and linelevel outputs, the Rem terminal on the amplifier may be used as a remote output connection, and will provide power to turn on other amplifiers and processors in the system. ) 3. If you are connecting your Power Series amplifier to a source unit with output voltage higher than 4V, connect the output-signal wires of the source unit to the Universal Interface speaker inputs. Because the inputs have an impedance of 10K ohms, this connection will provide the best noise-free performance possible. Wiring the Speaker Output Connections 1. Connect the speakers, observing proper polarity, to the speaker output barrier strip on the amplifier using at least 16G high-quality speaker wire. (Note: The total impedance of the speakers connected to the outputs, when the amp is driven in stereo, must be at least 2 ohms. ) 2. If you are bridging the amplifier, connect the speaker wires to the terminals marked "bridge, observing proper " polarity. (Note: The total impedance of the speaker system to be connected to the amplifier must be at least 4 ohms in bridge mode. ) Wiring the Power Connections Refer to diagrams on page 3 for connector locations. For power, remote and speaker wires, strip 1/4" off one end of each jacket to reveal bare wire for insertion into the barrier strip connectors. 3. If you are running the amp in tri-mode (stereo and mono simultaneously to one or two pairs of satellite speakers and a subwoofer), refer to the chart above to determine the capacitor and inductor values you'll need to route bass signals to the woofer, and midrange and high frequencies to the satellite speakers. These passive crossover components will also ensure that the impedance of the speaker system doesn't drop below 2 ohms. If you are using conventional RCA input connections and a source unit with output voltage less than 4V, simply plug the RCA plugs into the RCA jacks on the amplifier. 4 From Source Unit IN4001 Diode To Amp System Setup and Adjustment Electronic Crossover The electronic crossover in the P-4020 and P-4040 should be used to route the appropriate signal to speakers intended to play only bass, or only midrange and treble frequencies. The crossover slope is 12dB/oct and the frequency is fixed at 80Hz. [. . . ] This is the maximum undistorted output level of your system, and it should not be exceeded during use. 3. After adjusting the level of the main speakers in your system, you should adjust the remaining channels (if you are using a P-4040 or a multi-amp system) for the desired system balance. You'll find this easiest to do by adjusting the channels in the following order: 1) front speakers, 2) rear speakers, 3) subwoofer. This wiring diagram shows a JBL P-4020 amplifier set for tri-mode operation. [. . . ]