Table Of Contents; Basic Specifications - JBL LS Series Service Manual

LS120P
LS120P SPECIFICATIONS
Amplifier Power (RMS):
Peak Dynamic Power *:
Driver:
Inputs:
Low-Pass Frequency:
Frequency Response:
Dimensions (H x W x D):
(with feet, controls, grille, etc.)
Weight:
JBL continually strives to update and improve existing products, as well as create new ones. The specifications and
details in this and related JBL publications are therefore subject to change without notice.
* The Peak Dynamic Power is measured by recording the highest center-to-peak voltage measured across the
output of a resistive load equal to minimum impedance of the transducer, using a 50Hz sine wave burst, 3 cycles
on, 17 cycles off.
- CONTENTS -
BASIC SPECIFICATIONS ......................................1
DETAILED SPECIFICATIONS ................................2
PACKING.............................................................4
CONTROLS/CONNECTIONS..................................5
OPERATION ........................................................7
EXPLODED VIEW/PARTS LIST...............................8
TEST SET-UP AND PROCEDURE...........................9
AMPLIFIER BLOCK DIAGRAM...............................10
DETAILED TROUBLESHOOTING.................... ......12
P.C.B. DRAWINGS...............................................13
ELECTRICAL PARTS LIST ...................................18
IC/TRANSISTOR PINOUTS.....................................22
SCHEMATICS....................................................23
400 Watts
700 Watts
12" (305mm) PolyPlas™
Line Level (switchable to LFE)
Variable from 50Hz to 150Hz
(24dB/octave, continuously variable)
25Hz - 150Hz (or Low-pass crossover setting)
20-1/16" x 14-3/4" x 17-1/4" (510mm x 375mm x 438mm)
57 lb/25.8kg
1