JENSEN JA1B Power Amplifier Owner’s Manual

: June 9, 2024
: Jensen

JENSEN JA Series Power Amplifier Owner’s Manual

POWER AMPLIFIER

JA1B
JA2B
JA4B

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Designed and Engineered in USA

Namsung America Inc.
©2023 Namsung America Inc.
All rights reserved.

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 written permission of NAMSUNG AMERICA INC.

NSA1022-V01

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 Turn-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 Indicator

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 Control

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

Power/Protect LED
Ground Connection
Remote Tum On
+ 12V DC Battery Connection
Fuse(s)
Speaker Connections

Typical Wire Routing

JA1B

Typical Wire Routing JA1B

JA2B

Typical Wire Routing JA2B

JA4B

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.

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.

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.

Note: Do not use both low and high level inputs at the same time – connect only one or the other.

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 icon (1)

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. tum 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 1 B (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

****JA1B

Continuous Power Output :

290W RMS x 1 Channel at 4Ω
470W RMS x 1 Channel at 2Ω
595W RMS x 1 Channel a 1Ω (50Hz and 1 % THD+NJ

Dynamic Power :

300W x 1 Channel at 50Hz at 4Ω
545W x 1 Channel at 50Hz at 2Ω
640W x 1 Channel at 50Hz at 1Ω (1 % THD+N)

Maximum Dynamic Power :

325W x 1 Channel at 50Hz at 4Ω
565W x 1 Channel at 50Hz at 2Ω
690W x 1 Channel at 50Hz at 1Ω (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 4Ω
105W RMS x 2 Channels at 2Ω
225W RMS x 1 Channel at 4Ω BRIDGED (1 % THD+N)

Dynamic Power :

100W x 2 Channels at 1 kHz at 4Ω
110W x 2 Channels at 1 kHz at 2Ω
230W x 1 Channel at 1 kHz at 4Ω BRIDGED (1 % THD+N)

Maximum Dynamic Power :

140W x 2 Channels at 1 kHz at 4Ω
170W x 2 Channels at 1 kHz at 2Ω
310W x 1 Channel at 1 kHz at 4Ω BRIDGED (10% 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 4Ω
115W RMS x 4 Channels at 2Ω
230W RMS x 2 Channels at 4Ω BRIDGED (1% THD+N)

Dynamic Power :

1 DOW x 4 Channels at 1 kHz at 4Ω
125W x 4 Channels at 1 kHz at 2Ω
255W x 2 Channels at 1 kHz at 4Ω BRIDGED (1 % THD+N)

Maximum Dynamic Power :

125W x 4 Channels at 1 kHz at 4Ω
185W x 4 Channels at 1 kHz at 2Ω
365W x 2 Channels at 1 kHz at 4Ω 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 D)

Troubleshooting

FCC Compliance

This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions:

this device may not cause harmful interference, and
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.