TUNING BASSPRO
BassPro provides several controls that simplify sonic integration
with virtually any vehicle’s unique acoustic properties. Please read
the following section carefully to familiarize yourself with the
function of each control.
Phase Switch:
This switch will reverse the phase of BassPro’s
output with respect to its input. When installing BassPro with an
existing factory or aftermarket system, depending on BassPro’s
location in the vehicle and the distance between it and the other
speakers in the car, changing the setting of the phase switch may
produce a discernable increase or decrease in the amount of
upper bass reproduced. Although the position that yields the
most upper bass is technically correct, you may choose the
position that best suits your taste.
Level Control:
This control will adjust the input sensitivity of
BassPro. Use this control to adjust the relative volume (loudness)
of BassPro with respect to the other speakers in the vehicle.
Crossover Control:
The crossover control adjusts the amount of
upper bass and midbass information present in BassPro’s output.
After listening to music on the system for a time, fine-tune the
Crossover control setting to achieve a smooth transition from the
BassPro to the rest of the system’s speakers while avoiding a
“hole,” where the sounds that occur between the BassPro and
other speakers seem to drop out.
Bass Boost Control:
BassPro’s interaction with the acoustics of
your vehicle may produce a peak or dip in BassPro’s response.
For the vast majority of vehicles, these peaks or dips occur at
about 40Hz – around the frequency of the lowest bass guitar
note. Use the Bass Boost control to correct that peak or dip.
Adjustment between 0dB and +9dB is possible. Although
response without any sharp peaks or dips is technically correct,
you may choose the position that best suits your taste.
Audio Sense Switch:
If you have used the High-Level inputs to
connect the BassPro to your system’s radio/head unit (see Input
Connections, above), set the Audio Sense switch in the “On”
position. This will allow the BassPro to sense voltage on the
speaker inputs and turn itself on when the rest of the audio
system turns on.
Input Load Switch:
This switch has an effect only when you
Power
Connections
Fuse
(20A)
High-Level
Input
Remote
Connection
Line-
Level
Inputs
Audio
Sense
Switch
Crossover
Control
Input
Load
Switch
Level
Control
Phase
Switch
Bass
Boost
Control
have used the High-Level inputs to connect the BassPro to your
system’s radio/head unit. For the lowest noise in most
applications, set the Input Load switch in the “High” position. In
some cases, (such as when using the radio’s power fader), the
“Low” position may produce better results.
Remote Connection:
This connector is compatible with the
RBC remote volume control (sold separately).
Adjustment sequence
1. Start with Level control set to minimum, the Phase switch set
to “0” and the Crossover and Bass Boost controls rotated to
the 3 o’clock position.
2. Choose program material with substantial bass content and
turn the volume control on your head unit to three-quarters of
its total output (approximately 3 o’clock on rotary controls).
3. Adjust the gain control clockwise until the BassPro’s volume
sounds balanced with the rest of the system.
4. Continue listening, making a mental note of the amount of
upper bass present in your system.
5. Switch the Phase switch to “180” and recheck for upper bass
content. There may be more upper bass, less upper bass, or
there may be no change. The position that provides the most
upper bass is correct, but you may choose either setting
according to your taste.
6. Adjust the Crossover control clockwise or counterclockwise
until the perceived output from BassPro, as heard at the
listening position, contains only low-frequency information;
i.e., you should NOT hear any vocals coming from BassPro
when you are seated in the normal listening position.
7. Adjust the Bass Boost control clockwise or counterclockwise
to suit your taste.
Note:
Although this adjustment sequence will in most cases
provide satisfactory tuning, the actual process may include
several readjustments of each of the controls since their settings
will interact with each other. If necessary, consult your authorized
JBL car audio dealer for help in tuning your system.
SPECIFICATIONS
Amplifier Power
: 125W RMS
Frequency Response
: 35Hz – 120Hz
Fuse
: 20A
Maximum Current Draw : 12A
Quiescent Current Draw : <800mA
Input Sensitivity
: 0.2V – 2V Line-Level Input
2V – 20V High-Level Input
Crossover Frequency
: 50Hz – 120Hz
Crossover Slope
: 12dB/octave
Bass Boost
: 0dB to +9dB @ 70Hz
Dimensions (W x H x D) : 13-9/16" x 9-7/8" x 2-13/16"
(344mm x 250mm x 71mm)
HARMAN International Industries, Incorporated
8500 Balboa Boulevard, Northridge, CA 91329 USA
© 2015 HARMAN International Industries, Incorporated. All rights reserved.
JBL is a trademark of HARMAN International Industries, Incorporated, registered in the
United States and/or other countries. All Rights Reserved. Features, specifications and
appearance are subject to change without notice.
