JBL BASS-16 Service manual
SERVICE MANUAL
BASS15/16
Powered Subwoofer
SERVICE MANUAL
JBL Consumer Products Inc.
80 Crossways Park West
Woodbury, N.Y. 11797
1-800-336-4JBL in the USA
A Harman International Company
Part No.: 1112-JBLBASS15/16
Powered Subwoofer BASS15/16
TABLE OF CONTENTS
Specifications .................................................................1
Features..........................................................................1
Powered Sub Test Setup...............................................2
Test Procedure ...............................................................3
Bass15 Block Diagram...................................................4
Bass16 Block Diagram...................................................5
Bass15 (120V) Amplifier Exploded View.......................6
Bass16 (120V) Amplifier Exploded View .....................7
Bass16 (230V) Amplifier Exploded View .....................8
Bass15/16 Speaker Cabinet Ass’y Exploded View.......9
SPECIFICATIONS
BASS 15/16
Amplifier Power (RMS) ...............100Watts
Low Frequency Woofer (2).............61/2"drivers,polypropylene
Design...........................Bass reflex enclosure, Grey or White
Inputs ...........................Speaker Level input
Outputs..........................FullRange Speaker
Crossover Frequency ................150Hz
Frequency Response ................40Hz - 150Hz (+/-3dB)
External Dimensions (Inches)
Height...........................15-3/4"
Width............................8-1/2"
Depth ...........................19-3/4"
External Dimensions (mms)
Height...........................400
Width............................216
Depth ...........................502
Weight...........................35lbs(15.9kg)
Bass15 Parts Lists .......................................................10
Bass16 Parts Lists .......................................................12
SCS115 & MUSIC 15 Packaging Views .....................14
Bass15 Printed Circuit Boards ...................................15
Bass16 Printed Circuit Boards ...................................17
Integrated Circuit Diagram...........................................19
Bass15 (120v version) Schematic Diagram ...............20
Bass16 (120v version) Schematic Diagram ...............21
Bass16 (230v version) Schematic Diagram ...............22
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The Bass15/16 powered subwoofer is part of the SCS
115 or MUSIC 15 System.
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100 watt output.
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Variable level control.
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Speaker level inputs, outputs for full range satellite
speakers.
FEATURES
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User friendly “auto on” circuit. Signal sensing
automatically turns the subwoofer on so you don't have
to; the subwoofer is meant to be left “on” without
continual use of the power switch.
1
Powered Subwoofer BASS15/16
BASS 15 POWERED SUB WOOFER TEST SETUP
(setup for Bass 15 & 16 are the same)
JBL continually strives to improve its products. New materials, production methods and design refinements are introduced into
existing models without notice as a routine expression of our design philosophy. For this reason, Bass Series loudspeakers
may differ in some respect from their published specifications and descriptions, but will always equal or exceed the original
specifications unless otherwise stated.
2
Powered Subwoofer
BASS15/16
TEST PROCEDURE
Equipment Needed:
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Function generator/signal generator/sweep generator
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Integrated Ampilfier
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Multimeter
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Speaker cables
UUT = Unit Under Test
General Function:
1. Connect two pairs of speaker cables to high level input terminal on UUT. Cables should be connected to an
integrated amplifier fed by the signal generator. Observe polarity of speaker cables.
2. Turn on generator and adjust so that speaker level output is 2.5V, 50 Hz.
3. Plug in UUT; red LED should be ON. Turn power switch to the ON or AUTO position and turn LEVEL control
full clockwise.
4. Green LED should light, immediate bass response should be heard and felt from port tube opening.
Sweep Function:
1. Follow steps 1-4 above, using a sweep generator as a signal source.
2. Sweep generator from 20Hz to 300Hz. Listen to the cabinet and drivers for any rattles, clicks, buzzes or any
other noises. If any noises are heard, remove driver and test.
Driver Function:
1. Remove one or both drivers from cabinet; remove + and - wire clips.
2. Check DC resistance of driver.
Bass 15 should be approximately 5.5 ohms.
Bass 16 should be approximately 5.8 ohms.
3. Connect a pair of speaker cables to driver terminals. Cables should be connected to an integrated amplifier
fed by a signal generator. Turn on generator and adjust so that speaker level is 5.0V.
4. Sweep generator from 20Hz to 1kHz. Listen to driver for any rubbing, buzzing or other unusual noises.
SERVICE NOTE (120v Version only)
Even though the Bass15 and 16 seem to have an on/off power switch, in fact the switch does not switch
the main power off to the amp assembly, even in the OFF position. All AC and DC voltages within the
amplifier are still active, so for safety concerns the AC power cord should be unplugged before any
servicing begins.
3
Powered Subwoofer BASS15/16
BASS 15 (120v US Version) BLOCK DIAGRAM
4
Powered Subwoofer BASS15/16
BASS 16 (120v US & 230v European Versions) BLOCK DIAGRAM
5
Powered Subwoofer BASS15/16
BASS 15 AMPLIFIER EXPLODED VIEW
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Powered Subwoofer BASS15/16
BASS 16 (120v version) AMPLIFIER EXPLODED VIEW
7
Powered Subwoofer BASS15/16
BASS 16 (230v version) AMPLIFIER EXPLODED VIEW
8
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