RE Audio BT900.4M User manual

900.4M
4ch MARINE amplifier
Owner’s Manual
reaudio.com

1
THANK YOU
for purchasing RE AUDIO Bluetooth®“MARINE” amplifiers BT-900.4M.
With almost no sacrifice on sound quality, BT-900.4M easily plays the music
from your mobile phone or tablet through Bluetooth®connection.
It provides users with intelligent, convenient, safe and stable both “in-car”
and “marine” multiple sound play solution. It is carefully designed for audio
enthusiasts persuing high-fidelity sound. It is built with strong output
power, perfect sound quality, and self protection. Whether listening to
classical music or the world's loudest rock music, it will bring you an
unprecedented music experience.
BT-900.4M features both remote turn on signal output and analog audio
output. This makes it easy to connect other amplifiers and it will acts as a
host amplifier to work with other amplifiers synchronously. The intelligent
engine monitoring fucntions can automatically shutdown amplfier to
protect battery from over discharge.
All RE AUDIO products are manufactured under strict quality control
system and we only use high quality components.
Proper installation will maximize the system’s overall performance. It is
recommended that you have our product installed by an authorized RE
AUDIO dealer. However, If you decide to install it by yourself, please care-
fully read through this manual to make your installation as easy and reliable
as possible.
If you need more information, your RE Audio Dealer will be glad to help. To
locate a RE Audio Dealer near you, go to our web site and look for “Locate
Dealer”.

2
FEATURES
• Corrosion-resistant ABYC compliant connectors
• Meets or exceeds ASTM d4329 (UV exposure)
• Built-in professional Bluetooth®signal processor module
• Intelligent switching between Bluetooth®and RCA signal
• Automatic Bluetooth®on and off
• Bluetooth®audio signal and remote turn on signal can be
passed to other amplifers
• SMD dedicated audio chip device
• Full MOSFET DC-DC PWM power supply
• Overload, shortcircuit, overheat, under voltage protection
• ROHS compliant production technique
INSTALLATION
• Note that the amplifier generates heat so a well ventilated place is
necessary
• Use at least 8-gauge wire for power and ground connections
• Use at least 12-gauge wire for speaker connections
• Use at least 16-gauge wire for remote connection
• Keep the wire connections as short as possible in order to minimize
power loss and provide a higher audio out quality
• Use the shortest ground connection to the chassis of the vessel or vehicle
and make sure that the paint is removed at the connection point
• Connect the remote input to the remote/antenna output of the head unit
• Mount the fuse holder within 200mm(8”) of the vessel’s or vehicle’s
battery. Use a fuse equal to that specified for your amplifier if a large,
single +12V line is run which feeds more than one amplifier add up all
required fuse ratings and use the total rating for the fuse
• Connect the speaker to the amplifier observing the correct phasing.
• Make sure that none of the speaker connections can touch the chassis of
the vessel or vehicle
• Connect the RCA inputs to the appropriate signal source using only the
highest quality RCA cables
• Make sure that the RCA and speaker cables do not run parallel to the
+12V wiring

3
INSTALLATION (continued)
1. Choose a flat, well-ventilated place to install amplifier.
2. Fix the amplifier using included screws as shown in Figure 1.
[Figure 1]
3. Each end cap has 5 mounting pins that match 5 holes on the amplifier.
Hold the end cap by both ends and push it towards the amplifier as shown
in Figure 2.
[Figure 2]

4
INSTALLATION (continued)
4. Press the end caps downward as shown in Figure 3.
[Figure 3]
5. Attach the antenna as shown in Figure 4.
To tighten the antenna, turn it
clockwise
[Figure 4]

5
BASIC WIRING
RCA Connection
5V Max signal input
Power & Speaker Connection

6
BRIDGED WIRING
RCA Connection
5V Max signal input
Power & Speaker Connection

7
ADD-ON WIRING
You could add an external amplifier for bass as shown below.
RCA Connection
Remote Output Connection

8
Paring with a Bluetooth®Device
SPECIFICATION
• Turn on your Bluetooth®enabled mobile phones or tablets
• Refering to your device’s manual, go to “Bluetooth”(or similar) menu
and enable it
• “Search” for Bluetooth®device to add a new device
• Choose “RE AUDIO” among found devices
• Your device will be paired with BT-900.4M automatically
• You’ll hear a beep from the speaker when your device is connected to
BT-900.4M for the first time
• The LED on top of BT-900.4M enters into “slow flashing” mode when you
play music throught Bluetooth®audio sigmal connection
NOTE:
1. When BT-900.4M’s remote is on and the battery voltage is higher than 11V,
your device can connect to BT-900.4M. On the other hand, when the battery voltage is
lower than 10V, BT-900.4M enters into low-voltage protection and disconnect with your
device automatically.
2. Make sure the engine is on when you use Bluetooth device to turn on or off
BT-900.4M.
3. For some Bluetooth enabled phones or tablets, you will be asked to enter a Passcode or
PIN. Enter “0000” to pair up with BT-900.4M.
Sampling Frequency 44.1KHz
Distance Range > 10m/30ft Bluetooth® SIG Class II
Radio Freque nc y 2. 4GHz
Bluetooth Receiver Sensitivity < -80dBm
4Ω4 x 80W
2Ω4 x 120W
4Ω, Bridged 2 x 230W
Input Level 0.2 ~ 5V
Crossover Frequency Low Pass 50~500Hz
High Pass 50~500Hz
Frequenc y Response 10~35KHz
Total Harmonic Distortion 4Ω< 0.1%
Signal to Noise Ratio > 90dB
Channel Separation > 60dB
M in imu m L o a d 2 Ω
Bluetooth Transmission Yes
Remot e Out put Y es
2.4G External Antenna Yes
Overload Protec tion Yes
Overheating Protection
10°C/176°F
Dimensions (L x W x H ) [in/mm] 12.6 x 7.4 x 2.2 / 320 x 188 x 56
RMS Power @ 14.4V

9
TROUBLESHOOTING
Before removing your amplifier, refer to the list below
and follow the suggested procedures. Always test the
speakers and their wires first.
• Make sure you have a good ground connection
• Check that battery is connected to (+) terminal
• Check all fuses. Replace it if necessary
• Make sure the protection LED is not illuminated
No Power
• Check for short circuits on speaker leads
• Check the speaker load if it’s not below the minimum load
• Remove speakers and reset the amplifier
• If the protection LED is still on, the amplifier needs servicing
Protection LED is on
• Check that the RCA audio cables are correctly plugged in
• Check all the speaker load wiring
• Check the headunit output and the amplifier level setting
No Output
• Check that the RCA audio cables are correctly plugged in
• Check all the speaker load wiring
• Check the headunit output and the amplifier input level setting
Low Output
• Check the RCA cables if they are not shorted to power ground at the
amplifier side
High “Hissing” Sound
• Check that the input level control is set to match the signal level of the head
unit. Always try to set the input level as low as possible.
• Check all the crossover frequencies are properly set
• Check for short circuits on the speaker leads
Distorted Sound
• Check that the minimum load impedance is correct
• Check that there is good air circulation around the amplifier. In some cases,
it may be necessary to add an external cooling fan
Overheat
If the above steps fail to remedy the situation, the system should be checked by
an authorized RE Audio Dealer.

10
Limited Warranty:
RE Audio warrants all manufactured electronic products to be free from
defects in material and workmanship for a period not to exceed ONE YEAR
from the date of purchase.
IMPORTANT WARRANTY NOTICE: RE Audio will only warrant and
service products displaying valid RE Audio serial numbers. WARRANTY
SERVICE WILL ONLY BE PERFORMED WHEN THE UNIT IS ACCOM-
PANIED BY A COPY OF THE ORIGINAL SALES RECEIPT FROM AN
AUTHORIZED DEALER. All product returned to RE Audio for service
MUST be accompanied by a Return Authorization Number, issued by RE
Audio in advance of shipment. The Return Authorization Number must be
clearly and conspicuously displayed on the shipping carton or RE Audio
will refuse delivery.
For Return Authorization Numbers, first call your RE Audio dealer you purchased
the products from. The dealer will help you to obtain Return Authorization Num-
bers.
This warranty extends only to the original purchaser and is not transferable.
Defective equipment must be returned within the warranty period, freight prepaid,
to the RE Audio Factory or an Authorized RE Audio Warranty Station.
This warranty covers only detects in materials and workmanship of manufactured
electronic products(amplifiers). Incidents of misuse, abuse, neglect, or unautho-
rized modification will not be covered within the terms of this warranty.
RE Audio reserves the right to refuse warranty service under such conditions.
RE Audio WILL NOT BE RESPONSIBLE FOR ANY DAMAGES, WHETH-
ER INCIDENTAL OR CONSEQUENTIAL, RELATED TO THE USE OF
THIS OR ANY OTHER PRODUCT BEARING OR SOLD UNDER THE RE
Audio BRAND NAME. USE THIS PRODUCT AT YOUR OWN RISK.
IMPROPER USE OF THIS PRODUCT CAN RESULT IN PROPERTY
DAMAGE, BODILY HARM, AND OR OTHER DAMAGE. RE Audio
ASSUMES NO RESPONSIBILITY FOR YOUR HEALTH OR SAFETY.