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PowerPlus Amplifiers 

420,840, 900, 1150, 1302, 1304 

Installation & Operation Manual 


Contents 

Introduction.2 

Features and Specifications.3 

Installation.4 

Wiring.5 

Speaker Wiring.7 

Indicators and Controls.11 

Testing.12 

Remote Input Level Control.12 

Troubleshooting.13 

CEA Power Output.14 


























PowerPlus Amplifiers 


Introduction 

The Jensen PowerPlus series of amplifiers were designed to meet or exceed 
the CEA-2006 test standards. These new standards give all participating 
manufacturers (and many don't participate) a baseline when comparing 
amplifiers of similar power output. The CEA Power rating protects you, the 
customer. “Power is power - it doesn't matter who makes it,” is not always true. 
What does matter is whether the power can be produced in the first place. The 
RMS rating is the true power you are getting. At Jensen, to be fair to you and to 
the competition, we rate our amps in the two most popular ratings, including 
the CEA RMS rating. So feel confident that your Jensen purchase decision 
was a sound one, and remember "If it's Too Loud, You're Too Old." 

Before You Begin 

We need to get the legal stuff out of the way, so please keep reading. 
Afterwards, you’ll be armed with the knowledge to install your new hard-hitting, 
speaker-pumping Jensen amplifier. 

Exposure to loud sounds or music can permanently damage your hearing. 
Unfortunately, in many cases, the damage is not noticeable until years later. In 
addition, loud music may hinder your ability to hear traffic, police, and fire or 
emergency vehicles. Please be responsible and have respect for other people 
by listening at moderate volumes! 

Warranty Service 

If your Jensen amplifier should ever require service, you will need the original 
dated receipt. If you must return the unit for any reason, always include the 
receipt with the product. 




2 





Features and Specifications 

Your new PowerPlus Jensen mobile stereo power amplifier is the amplifier of 
choice for the high demands of auto sound reproduction. With its deep-bass 
reproduction and plenty of reserve power, low harmonic distortion and neutral 
reproduction, the PowerPlus series of amplifiers takes Mobile Hi-Fi to new 
heights. Like all Jensen products, when it comes to accurate sound 
reproduction the PowerPlus series takes a back seat to no one. Jensen will 
bring your Hi-Fi experience to new heights with the following features: 

• Low profile Aluminum extruded heat sink 

• Pass-Thru RCA's 

• Variable Bass EQ 0 - 12dB @ 45Hz 

• 12dB / octave Low Pass and High Pass filters 

• Variable Input Level 400mV - 5V 

• Encapsulated power and speaker connectors 

• Short circuit, DC-offset and Thermal Overload protection circuitry 

• Blue illuminated VU level meter(s) 

• Diagnostic LED's - Green: Power, Red: Standby / Fault 

PowerPlus 420/840/1304 

• Low Pass filter 40 - 240Hz 

• High Pass filter 40 - 400Hz 

• High Pass/Low Pass/Full Range selector switch 

• Stereo/Mono Mode switch (PowerPlus 420) 

• 2/3/4 Channel Mode switch (PowerPlus 840 and 1304) 

PowerPlus 1302 

• Low Pass filter 50 - 250Hz 

• High Pass filter 40 - 500Hz 

• High Pass / Low Pass / Full Range selector switch 

• Stereo/Mono Mode switch 

• Remote Input Level Control w/ 5 meter interface cable 
PowerPlus 900 / 1150 

• Mono subwoofer amp 

• Low Pass filter 40 - 250Hz 

• Subsonic filter 10 - 40Hz, 12dB / octave 

• Remote Input Level Control w/ 5 meter interface cable 

Specifications 

PowerPlus 420 / 840 / 1302 / 1304 


Load Impedance: 2-4ohm 


PowerPlus Amplifiers 


• Signal to Noise @ 1 kHz: >100dB (rated power) 

• Channel Separation @ 1 kHz: >60dB 

• Frequency Response: 5-60 kHz, -3dB 

• Input Impedance: 20 kHz, nominal 

• THD+N @ 5 watts: 0.02%, 1 kHz, 14.4VDC 

PowerPlus 900 / 1150 

• Signal to Noise @ 125Hz: >100dB (rated power) 

• Channel Separation not applicable 

• THD+N @ 5 watts: 0.02%, 125Hz, 14.4VDC 

Power Output 

RMS Power Output @ 2% THD+N, 1kHz, 14.4VDC 

PowerPlus 420 

• 75 x 2 Watts, 4-ohm 

• 110 x 2 Watts, 2-ohm 

• 210 x 1 Watts, 4-ohm Bridged 

PowerPlus 840 

• 75 x 4 Watts, 4-ohm 

• 110 x 4 Watts, 2-ohm 

• 210x2 Watts, 4-ohm Bridged Stereo 

PowerPlus 900 

• 275 x 1 Watts, 4-ohm 

• 450 x 1 Watts, 2-ohm 

PowerPlus 1302 

• 195 x 2 Watts, 4-ohm 

• 320 x 2 Watts, 2-ohm 

• 650 x 1 Watts, 4-ohm Bridged 

PowerPlus 1304 

• 125 x 4 Watts, 4-ohm 

• 160 x 4 Watts, 2-ohm 

• 325 x 2 Watts, 4-ohm Bridged Stereo 

PowerPlus 1150 

• 350 x 1 Watts, 4-ohm 

• 575 x 1 Watts, 2-ohm 


Specifications subject to change without notice. 















PowerPlus Amplifiers 


Installation 

Before you begin the installation of your PowerPlus series amp remember, 
there are two ways to do things - right and twice! Use the proper installation 
techniques, tools and accessories to ensure that your Jensen PowerPlus 
series amp will put out all the power it was designed to. If necessary, seek a 
professional installer to have the amplifier installed correctly. Most mobile amp 
installations do not have the proper gauge wire for power and ground - do not 
let your amp be a victim of this common installation oversight! 


NOTE: This device is a high-power audio amplifier intended for 
installation in vehicles with a 12-Volt negative ground electrical system. 
Attempting to connect or operate the amplifier with another type of 
electrical system may cause damage to the amplifier or the electrical 
system. 


Installation Assistance 

For installation assistance, call 1-800-323-4815 during normal business hours, 
or visit www.jensen.com at any time. 

Supplies and Tools Needed 

To install the amplifier, you will need tools, supplies and adapters. It is best to 
make sure you have everything you need before you start. 

Supplies 

• Black electrical tape 

• Amplifier Installation Kit 

Tools 

• Cordless drill with assortment of bits 

• Flat-head and Philips screwdrivers 

• Wire cutters/strippers 

• Crimping tool 

• 12-volt test light or digital multimeter 

• Wire brush, sandpaper or scraping tool (ground connection to vehicle should 
be a clean, unpainted metal surface) 

Disconnect Battery 

Disconnect the negative (-) battery cable before starting the installation. Check 
the battery ground (there should be two (2) ground wires coming from the 
battery - one going to the starter mounting bolt or engine block and another 




going to the vehicle chassis) and make sure the battery is grounded to the 
chassis with at least a #8 gauge wire. Also check the alternator connections, 
making sure they are tight and free from corrosion, rust or dirt. 

Location and Mounting 

The amplifier’s compact design allows great flexibility in mounting. Common 
mounting locations include under the front passenger seat or in the trunk area. 

When selecting a location, remember that amplifiers generate heat. Select a 
location on a flat surface away from heat and moisture where air can circulate 
around the amplifier. 

Place the amplifier in the mounting location and mark the positions of the holes 
with a marker, pen or pencil. Carefully drill the mounting holes in the marked 
positions, then use the supplied mounting screws to securely fasten the 
amplifier to the mounting surface. 


WARNING: Do not cover the amplifier with carpets or enclose it behind 
interior trim panels, and do not mount the amplifier in an inverted or 
upside down configuration. Be sure the mounting location and the 
drilling of pilot holes will not damage any wires, control cables, fuel 
lines, fuel tanks, hydraulic lines or other vehicle systems or components. 


Routing Wires 

Proper wiring connections are illustrated on the following pages. If wiring 
connections are made incorrectly, the unit will not operate properly and could 
become permanently damaged. Follow the installation instructions carefully, or 
have the amplifier installed by an experienced technician. 










Power Wiring 

Charging System 

In some cases, the installation of just one (1) amplifier could be enough to 
overload your factory electrical system (i.e., alternator). Depending on the 
state of your electrical system and overall condition of your vehicle, you may 
need to upgrade your alternator and battery. After the vehicle is started, the 
alternator provides the power to your electrical system, not the battery. When 
the engine is running, the alternator is your main source of power. Upgrading 
the alternator should be your first consideration if you should experience a 
voltage drop in the system when operating your audio system. Adding 
capacitors and/or batteries without upgrading the alternator will only make the 
problem worse because these devices put an extra load on the alternator. After 
upgrading the alternator, capacitors and/or batteries can be installed if desired. 


Use the following recommended wire gauge as a guide when installing your 
amplifier(s): 


MODEL NUMBER 

MAX CURRENT DRAW 

MIN WIRE GAUGE 

420 

30A 

#8 

840 

50A 

#8 

900 

90A 

#4 

1150 

120A 

#4 

1302 

60A 

#6 

1304 

80A 

#8 


PowerPlus Amplifiers 


Power Terminal (+12V/B+) 

Connect the main power wire to the battery, within 18 inches from the positive 
(+) battery post, using an adequate size fuse or circuit breaker capable of 
handling the current of the selected power wire. A fuse or circuit breaker must 
be installed to prevent a possible electrical fire should the main power wire 
short to ground. 


[ POWER INPUT I 



Remote Terminal (REM) 

Connect the power antenna or amplifier turn-on lead from the receiver to the 
amplifier remote terminal. 



+12V 


GND 







































































PowerPlus Amplifiers 


Ground Terminal (GND) 

Make the ground lead as short as possible, leaving enough length to complete 
the installation and to allow for any service that may be needed at a later date. 
To ensure a good ground, scrape away any paint or undercoating to expose 
bare metal. Use a "ring" terminal of the proper gauge and an "outside star 
washer" (between the chassis and ring terminal) when making your ground 
connection. Although you’ve scraped away the paint to expose bare metal, the 
outside star washer will help to "bite into" the chassis for a tight, secure 
ground. 


[ POWER INPUT j 



Replacement Fuse Requirements (FUSE) 


Model 

Quantity 

Amps 

Type 

420 

2 

15 

ATO 

480 

2 

25 

ATO 

900 

3 

30 

ATO 

1150 

4 

30 

ATO 

1302 

1 

60A 

MAXI 

1304 

1 

80A 

MAXI 




6 










































Speaker Wiring 

The Speaker Wiring diagrams illustrate options for connecting one or two 
speakers. Observe the proper speaker polarity. 


NOTE: PowerPlus amplifiers can drive speakers with a nominal 
impedance range of 2~ 4-ohms. For maximum power, configure your 
speakers for a nominal 2-ohm load. 


NOTE: Do not overlook the use of the proper gauge speaker wire. The 
PowerPlus series of amplifiers require a minimum of 12-gauge wire. 


PowerPlus 900/1150 

Two Subwoofers One Subwoofer 



PowerPlus Amplifiers 


PowerPlus 420/1302 

Two Speakers One Subwoofer 


f SPEAKER OUTPUT) 

o 



2 ohm nominal 


MODE X-OVER 



ST MO HPF LPF FULL 


[SPEAKER OUTPUT) 

o 



4 ohm nominal 


MODE X-OVER 

m i m 

ri c_ _i 11 ! 

ST MO HPF LPF FULL 


Tri-Mode 


L 

Inductor 





n 



HPF LPF FULL 


c 

Capacitor 

-n- 



7 
















































































































































































































PowerPlus Amplifiers 


PowerPlus 840/1304 

Four Speakers 


3 



HPF LPF OFF 

X-OVER 



HPF LPF OFF 

X-OVER 


f SPEAKER OUTPUT ] 



4 ohm nominal 4 ohm nominal 

2 ohm minimum 2 ohm minimum 


Two Speakers and Bridged Subwoofer 




HPF LPF OFF 

X-OVER 


HPF LPF OFF 

X-OVER 


SPEAKER OUTPUT 



4 ohm nominal 


Two Subwoofers 


HPF LPF OFF HPF LPF OFF 

X-OVER X-OVER 


( SPEAKER OUTPUT ) 



4 ohm nominal 4 ohm nominal 


8 


















































































































































































































Input Wiring 

Most trunk/hatchback installations will require a 15-20 foot RCA cable, while 
pickup trucks and under-seat mounting will require a 6-12 foot RCA cable. 
Connect an RCA cable from your receiver to the RCA input on your amplifier. 

PowerPlus 420/900/1150/1302 



PowerPlus Amplifiers 


PowerPlus 840/1304 

The PowerPlus 1304 and 840 can be configured for three different input 
modes: 2 channel, 3 channel or 4 channel. 






2 Channel 

MODE 

n■ 








3 Channel 

MODE 

HE 

4 3 2 










X-OVER LPF HPF B 


- — ^ biTT 

1/2 INPUT GAIN BASSEQ HPF LPF X-OVER 




9 





















































PowerPlus Amplifiers 



4 Channel 

MODE 

cm 

4 3 2 




NOTE: The use of good quality RCA cables is just as important as power 
and speaker wire. Choose a high quality low capacitance cable for the 
best results. 


Connecting Additional Amplifiers 

Pass-Thru RCA connectors are provided to connect additional amplifiers 
without the need to purchase "Y" adapters. 


10 





























PowerPlus Amplifiers 


Indicators and Controls 

Power Indicator (POWER) 

The power indicator provides a visual indication that the amplifier is turned on. 

Input Level Control (LEVEL/GAIN) 

The INPUT LEVEL control (or GAIN) matches the output of your radio to the 
input of the amplifier. After the installation is complete, make sure the input 
level control on the amplifier is turned down all the way (counter-clockwise or 
all the way to the left). Play a tape or CD (make sure bass and treble settings 
or Bass EQ are flat) and turn the volume up slowly until you just start to hear 
distortion. Back the volume down just a bit. On the amplifier, slowly turn up the 
input level control (clockwise or to the right) until you just start to hear 
distortion, then back it down a bit. Now your radio and amplifier levels are 
matched. 

BASS EQ 

The Bass EQ is continuously adjustable from 0 to +12dB @ 45Hz. Adjusting 
the Bass Boost level allows different subwoofer/enclosure combinations to be 
equalized. Use this control to increase the level of low bass available from your 
subwoofer/enclosure combination. Ported and Band Pass enclosures should 
be limited to about +6dB to +9dB of boost. Sealed enclosures should be able 
to accept the full +12dB of boost, if necessary. The full +12dB of boost should 
be reserved for special applications since improper use of the Bass Boost 
could damage your subwoofers at high volumes. 

Low Pass Filter (LPF) 

The Low Pass Filter controls adjust the crossover point. Typical crossover is 
between 60Hz and 80Hz for ported and sealed enclosures. Bandpass boxes 
will typically use a higher crossover setting between 125Hz and 150Hz. Since 
musical tastes vary, you should play music that you would normally listen to in 
your vehicle, with the above settings as a starting point. If necessary, set the 
crossover by ear. 

High Pass Filter (HPF) 

The high pass filter will limit the low frequencies being transmitted to your 
speakers. This can be useful in number of situations. For example, if you 
selected the high pass filter and set the crossover to 40Hz, then you would 
have an infra-sonic (sub-sonic) filter at 40Hz, which would be useful with 
certain enclosure/subwoofer combinations that were tuned between 45Hz and 
50Hz. Other uses might include limiting the low frequencies to smaller 


speakers (6 1/2", 6 X 9", etc.) by adjusting the crossover to a higher setting 
(80-100Hz). 

Crossover (X-OVER) 

The Jensen PowerPlus series of amplifiers have built-in low-pass and high- 
pass crossover filters for bi-amplifying the system. Adjust the crossover to 
accommodate your chosen installation method. Select LPF (low pass filter) 
when the amplifier will be driving woofers or subwoofers. Choose FULL or OFF 
when crossover mode is not active and the amplifier is in “full range” mode. 
Select HPF (high pass filter) when the amplifier will be driving full-range or 
separate speakers, and you want to limit the “bass” being transferred to these 
speakers. 

Mode Switch 

PowerPlus 420 and 1302 

The 420 and 1302 come equiped with a ST/MO (stereo/mono) MODE switch. 
Use STEREO mode when you have a 2-channel input from the source unit. 
Use MONO mode when you have a single input from the source unit. See 
“Input Wiring” on page 9. 

PowerPlus 840 and 1304 

The 840 and 1304 come equiped with a 4/3/2 MODE switch and can be 
configured for three different input modes: 2 channel, 3 channel or 4 channel. 


11 





PowerPlus Amplifiers 


Testing 

Before finishing the installation, perform the following tests to make sure the 
wiring is correct and everything is operating properly. 

Reconnect Battery 

When wiring is complete, reconnect the battery negative terminal. 

Test Power Wiring 

Turn on the receiver, but do not turn up the volume. The amplifier power light 
should come on. If not, check the REM and +12V (B+) wires. Turn up the 
receiver volume slightly. All speakers should operate. If not, check wiring 
connections at amplifier and speakers. 

Test Speaker Connections 

These tests make sure the speakers are connected properly. If speakers don’t 
play at all, one (or both) speaker wires may be disconnected. 



Remote Input Level Control 

The PowerPlus 900,1150 and 1302 come equipped with a Remote Input 
Level Control. The Remote Input Level Control allows the input level to be 
adjusted from an alternate location. It can be mounted under-dash or in-dash. 
When the amplifier is used to drive subwoofers and the low pass crossover is 
activated, the Remote Input Level Control can be used as a “remote bass level 
control”. This enables you to control the bass level independent from the rest 
of the system. This is convenient for system tuning and/or when playing many 
different types of music. 

The Remote Input Level Control uses a 6-pin modular cable for connectivity. 
Simply plug the 6-pin modular cable into the amplifier and then into the 
Remote Input Level Control to activate the circuit. 

























































Troubleshooting 


Problem 

Possible Cause 

Corrective Action 

Amplifier does not 
turn on 

No power to +12V 
terminal 

Check fuse(s) 

No power to REM 
terminal 

Check head unit fuse(s) and 
wiring 

Blown main fuse at 
battery 

Replace fuse and identify 
cause of failure 

Blown fuse at amplifier 

Replace fuse and identify 
cause of failure 

Faulty ground 

Re-ground main power 
ground to bare metal 
chassis 

Volume control too 
sensitive 

Input level control 
adjusted too high 

Re-adjust the input level 
(refer to page 8) 

Distorted sound 

Input level control 
adjusted too high 

Re-adjust the input level 
(refer to page 8) 

Blows fuse(s) at amp 

Power wires connected 
backwards 

Reconnect power wires 
properly 

Internal problem with 
amp 

Take unit for service 

Engine noise / 
Alternator whine 

Ground loop(s) 

Use good quality shielded 
RCA cables 

Faulty ground at amp 

Re-ground amp to clean 
bare metal chassis 

Faulty ground at head 
unit 

Re-ground head unit to 
clean bare metal chassis 

Inductive coupling 

Re-route RCA and/or 
speaker wires away from 
factory harnesses 

Input level on amp set 
too high 

Re-adjust input level (refer 
to page 8) 

Thermal protection 
activated 

Amplifier driving 2 ohm 
load for long durations 

If the amplifier “thermals” 
frequently while driving 
subwoofers, install fan to 
keep amp cool. 


PowerPlus Amplifiers 


Short circuit 
protection activated 

Blown speakers 

Check all speakers 

Speaker wire(s) shorting 
to ground 

Check for faulty wiring 

Defective crossover 

Faulty passive crossover 

Low impedance 
protection activated 

Amp connected to 
improper load 

Check speaker connections 

Amp will not drive a 1 
ohm mono load, 2 ohm 
minimum in mono 
configuration 

Verify that speakers are 
connected properly 

Speakers defective/ 
blown 

Check speakers 

Faulty passive 
crossovers 

Check crossovers 

Poor bass response 

Speakers out of phase 

Check speaker polarity; 
reverse the connection to 
one speaker only if two 
subwoofers are connected 
to the amplifier. 


NOTE: If the protection light is activated with no speakers connected to 
the amplifier, and all the power connections are correct, this would 
indicate an internal problem with the amplifier. 

































PowerPlus Amplifiers 


CEA Power Output 







RMS Power Output @ 1% THD+N, 14.4VDC 

PowerPlus 420 

Power Output: 65 watts RMS X 2 channels into 4-ohms @ < 1% THD+N 
Signal to Noise Ratio: lOOdBA below reference (Reference: 1 watt, 4-ohms) 

Additional Power Output: 

90 watts RMS X 2 channels into 2-ohms @ < 1% THD+N 
170 watts RMS X 1 channels (Bridged Mono) into 4-ohms @ < 1 % THD+N 
Frequency Response: 10Hz to 60 kHz, -3dB (Reference: 1 watt) 
Dimensions: LI 0.5" x H2.5” x W11.75" 

PowerPlus 840 

Power Output: 70 watts RMS X 4 channels into 4-ohms @ < 1% THD+N 
Signal to Noise Ratio: lOOdBA below reference (Reference: 1 watt, 4-ohms) 

Additional Power Output: 

100 watts RMS X 4 channels into 2-ohms @ < 1% THD+N 
175 watts RMS X 2 channels (Bridged Stereo) into 4-ohms @ < 1% THD+N 
Frequency Response: 10Hz to 60 kHz, -3dB (Reference: 1 watt) 
Dimensions: LI4” x H2.5" x W11.75" 

PowerPlus 900 

Power Output: 260 watts RMS X 1 channels into 4-ohms @ < 1% THD+N 
Signal to Noise Ratio: lOOdBA below reference (Reference: 1 watt, 4-ohms) 

Additional Power Output: 

430 watts RMS X 1 channels into 2-ohms @ < 1% THD+N 
Frequency Response: 10Hz to 240Hz, -3dB (Reference: 1 watt) 
Dimensions: LI 7.25" x H2.5" x W11.75" 

PowerPlus 1150 

Power Output: 330 watts RMS X 1 channels into 4-ohms @ < 1% THD+N 
Signal to Noise Ratio: lOOdBA below reference (Reference: 1 watt, 4-ohms) 

Additional Power Output: 

550 watts RMS X 1 channels into 2-ohms @ < 1% THD+N 
Frequency Response: 10Hz to 240Hz, -3dB (Reference: 1 watt) 
Dimensions: LI9" x H2.5" x W11.75" 


PowerPlus 1302 


Power Output: 175 watts RMS X 2 channels into 4-ohms @ < 1% THD+N 
Signal to Noise Ratio: lOOdBA below reference (Reference: 1 watt, 4-ohms) 

Additional Power Output: 

280 watts RMS X 2 channels into 2-ohms @ < 1% THD+N 
570 watts RMS X 1 channels (Bridged Mono) into 4-ohms @ < 1% THD+N 
Frequency Response: 10Hz to 60 kHz, -3dB (Reference: 1 watt) 
Dimensions: LI 5.5" x 2.5” x 11.75” 

PowerPlus 1304 

Power Output: 117 watts RMS X 4 channels into 4-ohms @ < 1% THD+N 
Signal to Noise Ratio: lOOdBA below reference (Reference: 1 watt, 4-ohms) 

Additional Power Output: 

145 watts RMS X 4 channels into 2-ohms @ < 1% THD+N 
290 watts RMS X 2 channels (Bridged Stereo) into 4-ohms @ < 1% THD+N 
Frequency Response: 10Hz to 60 kHz, -3dB (Reference: 1 watt) 
Dimensions: LI 5.5" x 2.5” x 11.75" 


if it's too 

LOUD 


you're too 

OLD! 1 


•JENSEN' 


Audiovox Electronics Corporation 
Hauppauge, NY 11788 

1-800-323-4815 

www.jensen.com 

© 2006 Audiovox 
v. 111806 


14