Installation And Setup - JBL Power BPX1100.1 Owner's Manual

6

INSTALLATION AND SETUP

SETTING THE Using the 2-Channel Mode
OUTPUT MODE With any Power Series amplifier, you
Setting an output mode depends on can also drive two woofers separately
your choice of system configuration and by connecting the speakers in the
the nominal impedace of your speaker 2-channel mode (see Figure 1 on page
system. JBL Power Series BPx 3). In this mode, the minimum nominal
impedance is 2 ohms. On BPx models,
amplifiers provide rated power into
any impedance between 1 and 4 ohms. set the OUTPUT MODE switch to
The BPx500.1, BPx1100.1 and BPx2200.1 2CH/BR.
amplifiers can be configured to provide
SETTING THE
high voltage to loads of 2 ohms or
CROSSOVER(S)
greater, or high current for loads below
IMPORTANT: If you plan to use the
2 ohms.
Px300.4 or Px600.2 to drive full-range
Using the Bridge Mode speakers, set the X-OVER MODE
If your speaker system has a nominal switch(es) to FLAT and skip to the next
impedance of 2 ohms or greater, bridge section, "Setting Input Sensitivity."
the amplifier's two channels to drive the
1. Initially set the X-OVER FREQ
speaker(s). On BPx models, set the
OUTPUT MODE switch to 2CH/BR (see
Figure 2 on page 3).
Using the Parallel Mode
(BPx Models Only)
If the nominal speaker-system
impedance is less than 2 ohms,
2. Depending on your system plan, set
connect the two amplifier channels
in parallel to drive the speaker(s),
as shown in Figure 3 on page 3.
3. For HP filters, set the X-OVER SLOPE
On BPx models, set the OUTPUT MODE
switch to PARALLEL.
NOTE: If the nominal impedance of your
subwoofer system is close to 2 ohms,
For LP filters, use 12dB or 24dB
try both series and parallel to determine
according to taste. However, using
which mode provides the highest
a 24dB slope will make bass less
volume. Use the I/E OPT LED according
directional since midrange frequencies
to "Setting Input Sensitivity" on the
are being filtered from the woofer's
right.
response. When choosing a low-pass
filter frequency for your subwoofers,
choose the highest frequency that will
remove vocal information from the
sound of the subwoofer.
SETTING INPUT
SENSITIVITY
NOTE: For BPx models, you can use the
supplied REMOTE LEVEL CONTROL
instead of the amplifier's INPUT LEVEL
control to set input sensitivity. Connect
the remote module's attached cable to
the REMOTE LEVEL CONTROL (RJ-11)
jack on the amplifier's input panel.
1. Initially, turn the INPUT LEVEL
control(s) to the minimum
(counterclockwise) position(s).
2. Reconnect the (–) negative lead to
your vehicle's battery. Apply power to
the audio system and play a dynamic
music track from CD or tape.
NOTE: After the source unit is on, blue
control(s) midway. Later, when
LEDs (on the top panel) will illuminate,
listening to music (in the next
indicating the amplifier is on. If not,
section), adjust them for least-
check the wiring, especially the
perceived distortion from midrange
remote connection from the source
and high-frequency speakers, while
unit. Also refer to "Troubleshooting"
allowing them to reproduce as much
on the next page.
bass as possible.
3. On the source unit, increase the
volume control to maximum position.
the X-OVER MODE switch(es) to LP
Slowly increase the INPUT LEVEL
(low-pass), HP (high-pass), or FLAT.
control(s) (clockwise) towards three
o' clock and observe the I-E/OPT LED
switch(es) to 24dB to limit bass and
(on the amplifier top). At the ideal set-
provide increased system volume
ting, it should flash on musical peaks,
with less distortion.
signifying maximum voltage is being
delivered in the 2-channel or bridge
modes, or maximum current is being
delivered in the parallel mode. If the
I-E/OPT LED is on steadily, the
amplifier is being overdriven. Turn the
INPUT LEVEL control(s) back slightly
until the I-E/OPT LED flashes on
musical peaks.
SETTING DBO
(ALL MODELS
EXCEPT PX600.2)
Dynamic Bass Optimizer™ (DBO) is
a new approach to enhancing low-
frequency reproduction in a vehicle.
Conventional bass boost controls add
bass at a fixed frequency and cause the
amplifier to consume considerable
power. DBO conserves valuable power
at the lowest frequencies and allows
you to adjust the level and "character"
of the bass sound, instead of just the
amount of boom.
Since a subwoofer in a vented box is
given to overexcursion below the tuned
frequency, set the HP FREQ control 10Hz
below the box's resonant (tuned)
frequency (e.g., 30Hz for a vented box
tuned to 40Hz). Power typically wasted
in this region will now be conserved and
be available for frequencies the
enclosure will reproduce. Use the
BOOST Installation and setup control to
boost the bass at the set frequency by
as much as 12dB, as shown in Figure 8.
DBO HP FREQ Control HP FREQ
(adjusts cut-off
frequency)
dB 20Hz 100Hz
0
-3
-6
-9
-12
20 80 Freq. (Hz)
DBO BOOST Control
BOOST
(adjusts boost amount
at cut-off frequency)
dB MIN MAX
12
6
0
-6
-12
20 80 Freq. (Hz)
Figure 8. Frequency response curves
show typical DBO control ranges for
selected JBL Power Series amplifiers.