P 80.2 (serv.man2) - JBL Car Audio User Guide / Operation Manual. Page 5

5

Initially, turn the input-sensitivity
LEVEL control to its maximum
(counter-clockwise) position. Turn
on the source unit and increase the
volume control until it is approxi-
mately three-quarters of maximum-
output level. Slowly increase the
input LEVEL control (clockwise)
while listening to the quality of the
reproduced sound. When you hear
distortion on the music peaks, turn
the LEVEL control back slightly. This
is the maximum undistorted output
level of your system. Turning the
LEVEL control up farther WILL NOT
INCREASE THE OUTPUT POWER
OF YOUR AMPLIFIER! It will only
decrease the amount of volume-
control rotation before the amp is at
full-output power. It will also
increase the amount of extraneous
noise present in your system.

Connect a pair of signal cables with
RCA-type ends between the connec-
tors on the amplifier and the RCA-
type signal connectors on the
source unit. If your radio has only
speaker-level outputs, you should
connect them to the speaker-level
input connectors, observing proper
polarity. When using the speaker-
level inputs, it is not necessary to
connect a wire between the
“remote” terminal of the amplifier
and the “remote” lead from the
source unit. The speaker-level
inputs will sense voltage on the
speaker outputs and turn the ampli-
fier on automatically.
If you are installing a P80.4 amplifier
and your source unit has only one
pair of RCA-type output connectors
and a pair of speaker-level outputs,
you may connect the RCA outputs
to a pair of amplifier input channels
(front or rear), and the speaker-level
outputs to the other pair of amplifier
input channels.

Refer to figures 1–6 for location of
adjustment switches and controls.
Electronic Crossover and Bass Boost
P80.2, P80.4, P180.2
The electronic crossover can be
selected as a 12dB/oct. high-pass fil-
ter (HPF) 12dB/oct. low-pass filter
(LPF) or it can be defeated (FLAT).
The crossover frequency can be set
at any frequency between 32Hz and
320Hz.
BP150.1, BP300.1
These amplifiers are designed to 
drive subwoofers. Consequently, the 
electronic crossover is a 12dB/oct. 
low-pass filter which can be set at
any frequency between 32Hz and
320Hz.
The bass boost control will provide
up to 6dB of boost at 50Hz.

The BP150.1 and BP300.1 are
designed to provide constant bass
regardless of the position of the
source unit’s front-to-rear fader posi-
tion. Use of this feature requires that
all four inputs are connected to the
source unit as labeled on the ampli-
fier (front, rear, right and left). If your
source unit has only one pair of
RCA-type output connectors and a
pair of speaker-level outputs, you
may connect the RCA outputs to a
pair of amplifier input channels
(front or rear), and the speaker level
outputs to the other pair of amplifier
input channels. If nonfading bass is
not important in your system, con-
nect a pair of inputs, either speaker-
level or RCA-type, to either the front
or rear input connectors on the
amplifier.