NavAtlas BMA476BT Waterproof Digital 4 Channel Amplifiers Owner’s Manual

BMA476BT Waterproof Digital 4 Channel Amplifiers
Owner’s Manual IP66 Rated

Preparation

Amplifier Features

• Meets or exceeds ASTM d4329 (UV exposure)
• Built-in professional Bluetooth® signal processor module(BMA476Bn
• Intelligent switching between Bluetooth® and RCA signal(BMA476Bn
• Automatic Bluetooth® on and off(BMA4768T)
• SMD dedicated audio chip device
• Full MOSFET DC-DC PWM power supply
• Overload. short circuit. overheat. under voltage protection

Please read the 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 the negative battery terminal (consult a qualified technician for instructions).
• Avoid installing the amplifier where it will be subject to high temperatures (such as from direct sunlight) or subject to dust. dirt or excessive vibration.
• Use extreme caution when drilling holes to avoid damaging fuel lines or existing 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.
• 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.
• The optimum mounting location varies. 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 wiring.
• The + 12V wire MUST be fused within 18″ of the battery for the 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) outputs.

CAUTION

• Keep low-level inputs away from any power wires to avoid engine noise.
• Never run any wires underneath or outside the vehicle

Audio Inputs

1. Audio Input
2. Bluetooth Antenna

Amplifier Controls

1. Bluetooth Pairing LED (ONLY BMA4768T) Protection Mode LED
2. Power
3. Gain
4. High Pass Filter

Power and Speaker Connections

1. Speaker Outs
2. Power Input

Typical Wire Routing

Main Power Connections
Connect+ 12V. GND and REM wires accordingly. A suitable fuse MUST be installed on the+ 12V lead within 18″ of the battery for protection of the vehicle’s electrical system.

Fuse Rating
When replacing fuses. make sure the new fuse is the correct type and amperage. Using an incorrect fuse could damage the amplifier.
BMA475 30Ax1
BMA476BT 30Ax1

Power/Ground Wire Size
For optimum performance. use only the wire size listed below or larger. Make sure to use the same size power and ground wire.
BMA475 AWG12
BMA4768T AWG12

Amplifier Connections

Speaker Connections
Connect speaker wires observing polarity. The minimum impedance is 2 ohms. (4ohms only for bridge mode.)

Input Signal Connections
Low-Level Input (RCA)
A Low-level (RCA) input signal is preferred for best performance. Using twisted pair construction RCA cables will minimize noise.

Configuration/Setup

Input level Control| 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 the audible distortion is heard. then slightly counterclockwise to provide the best match. Repeat for all input level controls.
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Hi-Pass Frequency
Control| This control allows precise adjustment of the crossover frequency (35Hz – 250Hz).
LED Indicators
(at the top panel
of amplifier)| The green LED indicator illuminates during normal operation (POWER) and the red LED indicator 0is visible when the amplifier detects a fault (PROTECTION). The Blue LED indicator is visible when BMA476BT is paired with a Bluetooth device (PAIRING).

*Note: Loosen/tighten the screws to open/close the control panel at top of the amplifier.

Bluetooth Operation (BMA476BT)

Pairing a Device

Preparation| Before you can use a Bluetooth device. it must be paired and connected. Make sure that Bluetooth is activated on your device before you begin the pairing process.
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Pairing a New Device| The BMA476BT broadcasts the pairing signal constantly when no devices are currently connected.  Complete the pairing sequence from your Bluetooth device.

The device name is ··NA300BT”

Streaming Audio Operation

The BMA4768T supports A2DP (advanced audio distribution profile) wireless streaming audio from your Bluetooth mobile device directly.
When paired. you can also control your music from your Bluetooth mobile device.
Note before you use Bluetooth:

1. Once your device has been paired to the BMA476BT. it will automatically connect when the device is in range. there will not be a need to manually connect once the amplifier is powered off and on.

2. When your device and the BMA476BT are connected. the amplifier will automatically switch from Line-in (RCA) to BT streaming once a music app is started (Music  player. Internet radio. ECT … )

3. When an incoming phone call is received. the music will pause and resume once the call has ended. incoming calls will not be transmitted to the amplifier
   (Hands-free mode is not supported. only A2DP streaming)

4. To switch back to Line-in (RCA) on the amplifier. all music apps on your device must be stopped and terminated.

Specifications

BMA475
Power Output:

• 75 Watts x 4 channels @ 4 Ohms
• 98 Watts x 4 channels @ 2 Ohms
• 140 Watts x 2 channels @ 4 Ohms
• 300 Watts total RMS Power

Peak Music Power Output: 1200 Watts
Signal to noise ratio: > 80dB (THD < 0.5°/o @ 40, 14.4V)
Frequency response: 10Hz- 25kHz (4 Ohms)
Amplifier dimensions: 1 0″ W x 3″ H x 1.5″ D

BMA476BT
Power Output:

• 75 Watts x 4 channels @ 4 Ohms
• 98 Watts x 4 channels @ 2 Ohms
• 140 Watts x 2 channels @ 4 Ohms
• 300 Watts total RMS Power

Peak Music Power Output: 1200 Watts
Signal to noise ratio: > 80dB (THD < 0.5°/o @ 40, 14.4V)
Frequency response: 10Hz- 25kHz (4 Ohms)
Amplifier dimensions: 1 0″ W x 3″ H x 1.5″ D

Bluetooth

• A2DP, AVRCP
• Bluetooth 4.0+ EDR
• iDS and Android support

CEA-2006 Power Standard Specifications (reference: 14.4VDC +1- 0.2V. 20Hz- 20kHz)

Power Output:
75 Watts RMS x 4 channels at 4 ohms and~1% THD+N
Signal to Noise Ratio: 85dBA (reference: 1 watt into 4 ohms)

Troubleshooting

Problem

| Cause|

Action

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The 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 connectedw| Check connection to ground
Fuse(s) blown| Replace fuse(s)
Unit has power -LED is green  (but no sound)| Speaker wires are not connected| Check connections at speakers
Volume turned all the way down| The increase volume level at the head unit
One or more speaker wires touching each other or touching the 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 the 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 the 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 the 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 load less than 2 ohms (stereo). Speaker load less than 4 ohms (bridged)| Adjust speaker load – amplifier will not operate at less than 4 ohms when bridged
Distorted audio
output| Incorrect input signal type or input level too high| Check connections and reduce/ adjust the input level
Low audio output| Incorrect input signal type or input level too low| Check connections and increase/ adjust the input level
Unstable
Bluetooth signal| BT signal needs improvement| Extend Bluetooth antenna wire

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 8 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/TV technician for help.
• Only shielded interface cable should be used.

Finally. any changes or modifications to the equipment by the user not expressly approved by the grantee or manufacturer could void the user’s authority to operate such equipment.

One-Year Limited Warranty

This warranty gives you specific legal rights. You may also have other rights which vary from state to state.
Namsung America Corp. warrants this product to the original purchaser to be free from defects in material and workmanship for a period of one year from the date of the original purchase.
Namsung America Corp. 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 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 an 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 the return shipment of the product.

What to do?

1. 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.
2. 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.
3. Please describe your problem in writing and include your name. and a return UPS shipping address (P.O. Box not acceptable). and a daytime phone number with your shipment.
4. For more information and for the location of the nearest authorized service center please contact us:
   • Call us toll-free at 1-844-NAVATLAS.
   1-844-628-2852

Exclusion of Certain Damages: This warranty is exclusive and in lieu of any and all other warranties. expressed or implied. 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.

Customer Service Toll-Free: 1-844-628-2852
The Bluetooth® word mark and logos are owned by the Bluetooth SIG. Inc.
and any use of such marks by Namsung is under license.
Details and specifications mentioned in this document may be updated and subject to change without notice.
©2016 Namsung America Corp. All rights reserved.
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| NavAtlas BMA476BT Waterproof Digital 4 Channel Amplifiers [pdf] Owner's Manual
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