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-code:
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 speaker-level outputs, the Rem termi- nal on the amplifier may be used as a remote output connection and will provide power to turn on other ampli- fiers and processors in the system.) (Note: The front and rear inputs on the P-2510 are summed to mono inside the amp, and will provide constant bass regardless of the position of source unit balance and fader controls.)
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 connec- tion will provide the best noise-free performance possible.
4.In some systems it may be desirable to have two sources play simultane- ously through the audio system.
For instance, if you have a factory- installed radio in your car and you want to add an aftermarket CD player, you may connect the CD player to the RCA inputs of the amp, and the facto- ry radio to the Universal Interface speaker inputs. (Note: Front and rear channels of the CD and radio must be driven into the front and rear inputs of the amplifier. Use Y adapters if neces- sary.) The Universal Interface circuitry will isolate the two signals from each other while allowing them to drive the amp simultaneously. Therefore, switching from one source to the other is as simple as turning the unused source off and the other on. (Note: You must connect the remote turn-on wire from the CD player to the Rem terminal on the amp. Install a diode in the remote line from the CD player as shown in the diagram on this page.)
System Setup and Adjustment
Electronic Crossover
The electronic crossover in the P-7520, P-7540 and P-2510 should be used to route the appropriate signal to speakers intended to play only bass, midbass or midrange and treble frequencies. The crossover slope is 12dB/oct and the fre-
quency is variable from 32Hz – 320Hz.
Pre-amp Outputs
Connect these to the input connectors of other amplifiers or processors in your system.
The crossover-selector switch determines which filter will be assigned to the pre- amp outputs. The pre-amp outputs may be High Pass (switch set to HP), Low Pass (switch set to LP) or unfiltered (switch set to Flat). The crossover-frequency is deter- mined by the crossover frequency control and will be the same frequency as the amplifier channels affected by that con- trol.
Refer to the “Applications” section for system expansion possibilities.
Setting Input Sensitivity
Proper input-sensitivity control settings on Power Series amplifiers are critical to ensure optimum performance, low noise levels and maximum system reliability. As a general rule, controls at the front end of a system (source, equalizers and other processors) should be set as high as possible with the amplifier input sensi- tivity set as low as possible while still providing adequate volume levels. Using a high signal level and a low sensitivity setting will help keep background noise in the system to a minimum.
| From | IN4001 Diode | To |
| Source |
| |
| Unit | | Amp |
Initially, turn the input sensitivity GAIN control to its minimum (counterclock- wise) position (refer to Figure 9).
1.Reconnect the (–) negative lead to your vehicle’s battery. Apply power to the audio system and play a favorite music track from CD or tape. (Note: After the source unit is on, the JBL badge (on the top panel) will illumi- nate, indicating the amplifier is on. If not, check the wiring, especially the remote connection from the source unit. Also refer to “Troubleshooting” on the next page.)
2.On the source unit, increase the volume control until it is approxi- mately 3/4 of its maximum output level. Slowly increase the Input Sensitivity control (clockwise) towards three o’clock and, at the same time, listen to the quality of the reproduced sound. At some point, you’ll hear distortion on the music peaks. Stop the adjustment and turn it back slightly. This is the maximum undistorted output level of your sys- tem, and it should not be exceeded during use.
