JBL P-4020 Stereo Amplifier User Manual


 
2
Amplifier Features
4-, 3- or 2-channel operation (P-4040)
2- or 1-channel operation (P-4020)
Simultaneous stereo and mono
operation
Built-in 12dB/oct electronic crossover
Balanced differential input
Pre-amp outputs (filtered on P-4040)
Oversized Floating Rail Mosfet Power
Supply
Universal Interface
Common Sense turn-on
Variable input sensitivity (250mV–4V)
Fully complementary, direct coupled
discrete power amplifier circuitry
Gold-plated power, input and output
connectors
2-Ohm stable (stereo)
JBL badge lights when amp is operat-
ing and flashes when protection circuit
is activated
Made in USA
About This Manual
To attain maximum amplifier perfor-
mance, we encourage you to read the
remaining pages before installing and
operating your new JBL Power Series
amplifier. Especially review the
Applications section for ideas on design-
ing and expanding your system. Also,
save these instructions for future refer-
ence. Important: Installation of automo-
tive stereo components can require
extensive experience in performing a
variety of electrical and mechanical pro-
cedures. Although these instructions
explain how to install a JBL Power Series
amplifier in a general sense, they do not
show the exact installation methods for
your particular vehicle. If you do not
have the experience necessary, do not
attempt the installation yourself; instead
ask your Authorized JBL Car-Audio Dealer
about professional installation options.
Installation Precautions and Notes
The JBL P-4020 (or P-4040) has five
levels of circuit protection that monitor
the amplifier and will shut it down if
the electrical system voltage drops
below 5Vdc or exceeds 18Vdc, temper-
atures are above 194° F (90° C), short
circuits occur, or current draw exceeds
product specifications. For best perfor-
mance, check the intended mounting
site to make sure the operating envi-
ronment does not create conditions
that will trigger the protection circuit.
Prior to installation, turn off all audio
systems and other electrical devices.
Also disconnect the (–) negative lead
from the vehicle’s battery.
At the installation site, locate and make
a note of all fuel lines, hydraulic brake
lines and electrical wiring. Use extreme
caution when cutting or drilling in and
around these areas.
Check clearances on both sides of a
planned mounting surface before
drilling any holes or installing any
screws. Remember that mounting
screws can extend behind the mount-
ing surface.
Thank you for purchasing your new
JBL Power Series™ amplifier. Power
Series amplifiers feature the latest
advances in discrete-circuit topology,
ensuring low distortion and superbly
clean and clear sound quality. In addition
to RCA-type pre-amp inputs, Power
Series amplifiers feature Universal
Interface™, designed to facilitate integra-
tion with factory-installed audio systems
for distortion-free performance that rivals
conventional pre-amp connections.
Included in the Universal Interface circuit
is Common Sense™ turn-on. Common
Sense turn-on senses the common-mode
voltage present on the speaker outputs of
factory and aftermarket radios, turning on
the amplifier without a separate remote
wire. All Power Series amplifiers feature
built-in electronic crossovers and pre-amp
outputs for easy system expansion with-
out requiring outboard processors.
P-4020/4040 OM. 7/14/98 11:42 AM Page 2