JENSEN 110JA1B Mono Amplifiers Owner’s Manual
- June 9, 2024
- Jensen
Table of Contents
JA SERIES
OWNER’S MANUAL
POWER AMPLIFER
JA 1 B JA2B JA4B
INSTALLATION / OWNER’S MANUAL
The Bluetooth® word mark and logos are owned by the Bluetooth® SIG, Inc.
Other trademarks and trade names are those of their respective owners.
Preparation
Please read entire manual before installation. Due to the technical nature of
amplifiers. it is highly recommended that your amplifier is installed by a
professional installer or an authorized dealer.
Before You Start
- Disconnect negative battery terminal. (consult a qualified technician for instructions)
- Avoid installing the amplifier where it would be subject to high temperatures. such as from direct sunlight. or where it would be subject to dust. dirt or excessive vibration.
- Use extreme caution when drilling holes to avoid damaging fuel lines or existing vehicle wiring.
- All amplifier installations require power. signal and speaker wires (not included).
- An amplifier installation kit (sold separately) is highly recommended to facilitate the installation. Consult your dealer for recommendations.
Mounting Location
- Choose a mounting location for the amplifier. Suggested locations include under a seat or in the trunk.
- The amplifier can be mounted horizontal (recommended) or vertical. For optimum performance. make sure to provide at least 1″ of space around all sides. Do not mount the amplifier under carpets or where airflow is restricted.
- Do not install the amplifier where it may be exposed to moisture.
- The optimum mounting location varies between vehicles. Remember to test all amplifier functions before completing the final mounting procedure.
Connection Descriptions
NOTE:
Be sure to follow specific instructions included with your amplifier
installation kit (not included with this amplifier). The information below
should be used as a general guideline only.
Power Wire (+ 12V)
-
Disconnect negative battery terminal before proceeding. Consult a qualified technician for instructions if you are unsure.
-
Plan wire routing before cutting any wires to length. Begin by routing the power + 12V wire from the battery to the amplifier location. Use a grommet when running wires through the firewall or metal openings. Avoid running the power wire near existing vehicle wiring to prevent induced noise from entering the audio system.
-
Use extreme caution when drilling holes to avoid damaging fuel lines or existing vehicle wiring.
-
The + 12V wire MUST be fused within 18″ of the battery for protection of the vehicle’s electrical system.
Ground Wire (GND) -
The amplifier ground wire should be as short as possible (no more than 36″ or 1 meter). Choose a clean unpainted section of metal or the vehicle chassis when attaching the ground connection. Be sure to clean the area of any dirt or grease.
Remote Tum-on Wire (REM) -
The remote turn-on wire connects to the head unit’s amplifier turn-on lead or power antenna output.
Speaker Wires
- Choose adequate gauge speaker wire depending on your exact amplifier/speaker combination. Be sure to observe polarity when connecting.
- Do not ground any speaker wires or connect any speaker wires together.
Input Signal
- The amplifier’s input signal connects to the head unit’s low level (RCA) or high level (speaker wire) outputs.
- Low level input signals deliver the best performance. If unavailable. use the high level inputs – when interfacing with factory head unit for instance.
Power/ Protect Indicators
- Colored LED indicators illuminate from the plastic power terminal.
- The blue LED illuminates during normal operation (POWER) and the red LED indicator is visible when the amplifier detects a fault (PROTECT).
CAUTION
- Do not use both low and high level inputs at the same time. Connect only one or the other.
- Keep low level inputs away from any power wires to avoid engine noise.
- Never run any wires underneath or outside the vehicle.
Audio Inputs and Controls
- Line Output
- Line Input
- High Level Input
- Reset
- Do not place anything in this area that could block the radio waves. as this may be a problem with your Bluetooth connection.
Power and Speaker Connections
1. Power/Protect LED
2. Ground Connection
3.Remote Turn On| 4. + 12V DC Battery Connection
5. Fuse(s)
6. Speaker Connections
---|---
Typical Wire Routing JA1B
Typical Wire Routing JA2B
Typical Wire Routing JA4B
Amplifier Connections
Speaker Connections
Connect speaker wires observing polarity. The minimum impedance load for the
amplifiers is 2 ohms stereo and 4 ohms bridged. Use of loads lower than these
is not recommended and may cause amplifier damage. The amplifiers can be
wired for stereo, bridged or stereo/ bridged simultaneous operation.
Typical speaker connections shown
Input Signal Connections
Low Level Input (RCA)
Low level (RCA) input signal is preferred for best performance. Typical trunk-
mount amplifier installations require a 17-20 foot RCA cable. Most trucks and
under-seat applications require a 6-9 foot RCA cable. Using twisted pair
construction RCA cables will minimize noise. 
Note: Do not use both low and high level inputs at the same time – connect only one or the other.
High Level Input
(Speaker Wire)
High level inputs should only be used when RCA outputs are not available from
the head unit. Connect the head unit speaker outputs to the high level input
connector as shown below. The black wire (signal reference ground) may or may
not require a connection to chassis ground depending on your particular
installation.
Controller App Download/Installation
Scan the above QR Code to download the Jensen DSP Amplifier Controller app
from the Apple App Store or Google Play Store onto your smartphone or tablet.
Use the app to control features including: X-Over. EQ, RGB Light
Customization. Volume and other amp settings directly from your smartphone or
tablet via Bluetooth.
Note:
JA amp series do not support audio streaming and hands free calls via
Bluetooth.
Bluetooth Pairing with App and AMP
Step 1 : Touch the BT icon1.
Step 2 : Touch the Scan icon 2 to search the Bluetooth amp.
Step 3 : Bluetooth amp list 3 to show what amp is paired. (If only one amp
is installed, one amp model number is displayed.)
Step 4: Select the amp model number you want to install from the device list
3.
Step 5 : Touch the drop down Icon 4 to show the version number of App and
amp and to see if the Bluetooth paring is completed successfully 5.
Step 6 : Touch Disconnect 6 to disconnect the amp from the App.
JENSEN DSP AMP App Operation
Input level Control
(Master Level at HOME Mode)| The input level control (gain) is used to obtain
the best possible match between the head unit audio output and the amplifier
input. Begin by turning the input level control fully counterclockwise. Next.
turn up the head unit volume control around 3/4 of the way up. Adjust the
input level control clockwise until audible distortion is heard, then slightly
counterclockwise to provide the best match. Repeat for all input level
controls.
---|---
X-OVERMode
( JA2B and JA4B )| The crossover is used to filter out frequencies above or
below a certain point. Choose LPF when using the amplifier with subwoofers,
HPF when using with midrange/tweeter combinations and FULL when using with
coaxial-type speakers.
Note: Choose FULL when using the amplifier in stereo/bridged simultaneous
mode. In this mode, passive crossovers are required. Failure to use the
correct passive components may damage the amplifier and/ or speakers. Consult
a qualified professional for recommendations.
X-OVER Mode
(JA1B)| JA 18 (Mono) amp works only with LPF.
X-OVER Control| This control allows precise adjustment of the crossover
frequency.
Bass Boost| This control provides additional boost@ 45Hz when used with
subwoofers. Adjust this control with caution – as improper use can damage
speakers!
EQ Presets| Select between the following EQ presets: Classic. Pop, Rock, Jazz.
Custom (allows user to enter custom EQ settings).
Custom EQ| Custom EQ from EQ Presets is selected to make the customized audio
settings and each gain per frequency can be adjusted at EQ Mode of the App.
RGB Color| It allows the amp illumination to be turned off or on at RGB mode
of the App. One color or multiple colors can be controlled.
Specifications
Continuous Power Output :| 290W RMS x 1 Channel at 40
470W RMS x 1 Channel at 20
595W RMS x 1 Channel at01(50Hz and 1% THD+N)
---|---
Dynamic Power :| 300W x 1 Channel at 50Hz at 4 0
545W x 1 Channel at 50Hz at 20
640W x 1 Channel at 50Hz at 10 (1% THD+N)
Maximum Dynamic Power :| 325W x 1 Channel at 50Hz at 40 565W x 1 Channel at
50Hz at 20 690W x 1 Channel at 50Hz at 10 (10% THD+N)
Signal to Noise :| 68dBA reference 1 Watt RMS
THD+N :| <0.09% at 1 Watt RMS from 20Hz to 300Hz
Amplifier dimensions:| 2.16″x 9.56″x 5.59″(H x W x D)
JA2B
Continuous Power Output :| 95W RMS x 2 Channels at 40
105W RMS x 2 Channels at 20
225W RMS x 1 Channel at 40 BRIDGED (1% THD+N)
---|---
Dynamic Power| 100W x 2 Channels at 1 kHz at 40 110W x 2 Channels at lkHz at
20 230W x 1 Channel at 1kHz at 40 BRIDGED (1°/0 THD+N)
Maximum Dynamic Power| 140W x 2 Channels at 1kHz at 40 170W x 2 Channels at
1kHz at 20 310W x 1 Channel at 1kHz at 40 BRIDGED (10°/0 THD+N)
Signal to Noise :| 72dBA reference 1 Watt RMS
THD+N :| <0.14% at 1 Watt RMS from 20Hz to 20kHz
Amplifier dimensions :| 2.16″x 6.57″x 5.59″(H x W x D)
JA4B
Continuous Power Output :| 90W RMS x 4 Channels at 40
115W RMS x 4 Channels at 20
230W RMS x 2 Channels at 40 BRIDGED (1% THD+N)
---|---
Dynamic Power :| 100W x 4 Channels at 1 kHz at 40 125W x 4 Channels at 1 kHz
at 20 255W x 2 Channels at 1kHz at 40 BRIDGED (1% THD+N)
Maximum Dynamic Power :| 125W x 4 Channels at 1kHz at 40 185W x 4 Channels at
1 kHz at 20 365W x 2 Channels at 1 kHz at 40 BRIDGED (10% THD+N)
Signal to Noise :| 70dBA reference 1 Watt RMS
THD+N :| <0.15% at 1 Watt RMS from 20Hz to 20kHz
Amplifier dimensions:| 2.16″x 8.38″x 5.59″(H x W x DI
Troubleshooting
| Problem | Cause | Action |
|---|
Unit will not turn on
(no power LED
indicator)| +12V wire not connected or incorrect voltage. REM wire not
connected or incorrect voltage| Check connections for proper voltage
(11-16VDC)
GND wire not connected| Check connection to ground
Fusels) blown| Replace fuse(s)
Unit has power –
LED is green (but
no sound)| Speaker wires not connected| Check connections at speakers
Volume turned all the way down| Increase volume level at head unit
One or more speaker wires touching each other or touching chassis ground|
Insulate all bare speaker wires from each other and chassis ground
Speaker(s) defective or damaged| Check/replace speaker(s)
Input signal not connected| Check high or low level inputs for proper
connection
Unit blows fuse(s)| Incorrect fuse rating| Use fuse(s) with correct rating
+12V wire touching chassis ground| Check for pinched wire
Speaker(s) defective or damaged| Check/replace speaker(s)
Engine noise| Bad ground connection| Make sure amplifier is grounded to clean
bare metal
Signal ground loop or RFI (radio frequency interference)| Re-route RCA cables
from existing high current wiring
LED illuminates red
(protect mode)| One or more speaker wires touching each other or touching
chassis ground| Insulate all bare speaker wires from each other and chassis
ground
Speaker(s) defective or damaged internally (shorted)| Check/replace speaker(s)
Speaker toad less than 2 ohms (stereo). Speaker load less than 4 ohms
(bridged)| –
Adjust speaker load amplifier will
not operate at less than 4 ohms whenbridged
Distorted audio
output| Incorrect input signal type or input level too high| Check connections
and reduce/adjust input level
Low audio output| Incorrect input signal type or input level too low| Check
connections and increase/adjust input level
One-Year (or Three-Yea~) Limited Warranty
This warranty gives you specific legal rights. You may also have other rights
which vary from state to state. Namsung America Inc warrants this product to
the original purchaser to be free from defects in material and workmanship
for a period of one year (or two years) from the date of the original
purchase.
Namsung America Inc agrees, at our option, during the warranty period, to
repair any defect in material or workmanship or to furnish an equal new,
renewed or comparable product (whichever is deemed necessary) in exchange
without charges. subject to verification of the defect or malfunction and
proof of the date of purchase. Subsequent replacement products are warranted
for the balance of the original warranty period.
Who is covered? This warranty is extended to the original retail
purchaser for products purchased from an authorized JENSEN dealer and used in
the U.S.A.
What is covered? This warranty covers all defects in material and workmanship
in this product. The following are not covered: software, installation/
removal costs, damage resulting from accident.misuse. abuse, neglect, product
modification, improper installation, incorrect line voltage, unauthorized
repair or failure to follow instructions supplied with the product, or damage
occurring during return shipment of the product. Specific license conditions
and copyright notices for the software can be found via
www.jensenmobile.com.
Warranty Coverage
Limited 1-year warranty when purchased from an authorized Jensen dealer.
or
Limited 3-year warranty when purchased from and professionally installed by an authorized Jensen dealer. (Proof of purchase and Installation required)
What to do?
- Before you call for service, check the troubleshooting guide in your owner’s manual. A slight adjustment of any custom controls may save you a service call.
- If you require service during the warranty period, you must carefully pack the product (preferably in the original package) and ship it by prepaid transportation with a copy of the original receipt from the retailer to an authorized service center.
- Please describe your problem in writing and include your name. a return UPS shipping address (P.O. Box not acceptable). and a daytime phone number with your shipment.
- For more information and for the location of the nearest authorized service center please contact us by one of the following methods:
• Call us toll-free at 888-921-4088 Monday-Friday, 9:00 a.m. to 5:00 p.m. ESTI
• E-mail us at [email protected]
Exclusion of Certain Damages: This warranty is exclusive and in lieu of any and all other warranties, expressed or implied, including without limitation the implied warranties of merchantability and fitness for a particular purpose and any obligation, liability, right. claim or remedy in contract or tort, whether or not arising from the company’s negligence, actual or imputed. No person or representative is authorized to assume for the company any other liability in connection with the sale of this product. In no event shall the company be liable for indirect, incidental or consequential damages.
FCC Compliance
This device complies with Part 15 of the FCC Rules. Operation is subject to
the following two conditions:
(1) this device may not cause harmful interference. and
(2) this device must accept any interference received. including interference
that may cause undesired operation.
Warning: Changes or modifications to this unit not expressly approved by
the party responsible for compliance could void the user’s authority to
operate the equipment.
Note: This equipment has been tested and found to comply with the limits
for a Class B digital device. pursuant to Part 15 of the FCC Rules. These
limits are designed to provide reasonable protection against harmful
interference in a residential installation. This equipment generates. uses and
can radiate radio frequency energy and. if not installed and used in
accordance with the instructions. may cause harmful interference to radio
communications. However. there is no guarantee that interference will not
occur in a particular installation. If this equipment does cause harmful
interference to radio or television reception. which can be determined by
turning the equipment off and on. the user is encouraged to try to correct
the interference by one or more of the following measures:
- Reorient or relocate the receiving antenna.
- Increase the separation between the equipment and receiver.
- Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
- Consult the dealer or an experienced radio/amp technician for help.
~
Customer Support
1-888-921-4088
(Monday-Friday, 9AM-5PM EST)
Visit https://www.jensenmobile.com
Designed and Engineered in USA
All rights reserved. No part of this publication may be reproduced.
distributed,
or transmitted In any form or by any means, including photocopying, recording.
or other electronic or mechanical methods,
without the prior wntton permission,
of NAMSUNG AMERICA INC.
NSA1022-V01
JENSEN®
Namsung America Inc.
©2023 Namsung America Inc.
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