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RE Audio BT900.4M

480W RMS 4-Channel BT Series Bluetooth Marine Amplifier

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RE Audio BT900.4M

480W RMS 4-Channel BT Series Bluetooth Marine Amplifier

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Bundles with this Product

50% Off NVX Universal Bluetooth Controller with Purchase!

Save $37.49 when you add an NVX XUBT3 Universal Bluetooth Controller to your Amplifier purchase. Simply click the "Add Both to Cart" button. This offer cannot be combined with any other coupons or offers.

37.50

92709

2265

RE Audio BT900.4M

$189.99

+

50% OFF

NVX XUBT3 Universal Bluetooth Controller Knob

$74.99

Special Price $37.49 ($74.99 if purchased separately)

NVX XUBT3 Universal Bluetooth Controller Knob

• iPhone, Android & Bluetooth Device Ready
• One Knob Controls it all – Track, Pause & Volume
• Flush in Dash or Under Dash Mounting options
• Add-on to any Radio or Device with AUX input

50% Off NVX Universal Bluetooth Controller with Purchase!

Save $37.49 when you add an NVX XUBT4 Universal Bluetooth Controller to your Amplifier purchase. Simply click the "Add Both to Cart" button. This offer cannot be combined with any other coupons or offers.

37.50

92709

2275

RE Audio BT900.4M

$189.99

+

50% OFF

NVX XUBT4 Universal Bluetooth Receiver and Remote Control

$74.99

Special Price $37.49 ($74.99 if purchased separately)

NVX XUBT4 Universal Bluetooth Receiver and Remote Control

• Marine Grade Bluetooth Audio Controller/Receiver
• Designed for marine and powersports applications
• Bluetooth version 4.0
• Delivers CD-like sound quality wirelessly
• Membrane Switchpad

(Offer 1 of 2)

Combined Total Price

$227.48

You Save $37.50

RE Audio Store

General Features:

  • BT Series 4-Channel Bluetooth Marine Amplifier
  • RMS Power Rating:
    • 4 ohms: 80 watts x 4 chan.
    • 2 ohms: 120 watts x 4 chan.
    • Bridged, 4 ohms: 230 watts x 2 chan.
  • Built-in professional Bluetooth® signal processor module
    • Works with most Bluetooth enabled devices
    • Bluetooth Range: Up to 30 feet (10m)
    • Intelligent switching between Bluetooth® and RCA signal
    • Automatic Bluetooth® on and off
    • Bluetooth antenna included
  • Accepts Bluetooth audio signal and RCA input
  • Intelligent switching between Bluetooth and RCA signal
  • Bluetooth audio and remote turn on signals can be passed to other amplifiers
  • Overload, short circuit, overheat and under voltage protection
  • 4 or 2 channel operation
  • Corrosion-resistant ABYC compliant connectors
  • Meets or exceeds ASTM d4329 (UV exposure)
  • SMD dedicated audio chip device
  • Full MOSFET DC-DC PWM power supply
  • ROHS compliant production technique
  • Variable high-pass filter: 50 - 500 Hz
  • Variable low-pass filter: 50 - 500 Hz
  • Input Level : 0.2 V ~ 5 V
  • Frequency Response: 10 - 3,500 Hz
  • Sampling Frequency: 44.1 KHz
  • Radio Frequency: 2.4GHz
  • Total Harmonic Distortion: < 0.1%
  • Signal to Noise Ratio: > 90dB
  • Channel Separation: > 60dB
  • Bluetooth Receiver Sensitivity: < -80dBm
  • 12 gauge OFC speaker wired recommended for installation
  • 4 - 8 gauge OFC power and ground wiring is recommended for installation
    • Contact us for information regarding a discount on select amplifier kits from our website when purchased together with this amplifier
  • Dimensions: 7.4"W x 12.6"L x 2.2"H
  • NON-marinised version available: RE Audio BT900.4
  • Authorized Internet Dealer
  • 1-year Manufacturer's Warranty


Check out the RE Audio BT900.4M Owner's Manual

Power Specifications - Full Range Channels

RMS Power @ 4 ohms

The RMS power rating is the measure of continuous power that an amplifier can output, or a speaker can handle. It is the most accurate depiction of real, continuous power that the industry has so far.

If the final impedance of your speakers or subwoofers equals 4 ohms, this is how much power this amplifier will supply at that ohm level. The higher the RMS wattage, the more clean and loud your music will sound.

80 watts x 4 channels
RMS Power @ 2 ohms

The RMS power rating is the measure of continuous power that an amplifier can output, or a speaker can handle. It is the most accurate depiction of real, continuous power that the industry has so far.

If the final impedance of your speakers or subwoofers equals 2 ohms, this is how much power this amplifier will supply at that ohm level. The higher the RMS wattage, the more clean and loud your music will sound.

120 watts x 4 channels
Bridged RMS Power

Bridging refers to combining two channels on an amplifier to create one channel with double the voltage and an increased power output. A 2-channel amplifier will bridge down to 1-channel and a 4-channel amplifier can bridge to create 2-channels. An amplifier is most commonly bridged to drive a subwoofer.

Remember, once you bridge two channels down to one its final impedance will be 4 ohms unless otherwise specified. This rating lists the RMS power created once an amplifier is bridged.

230 watts x 2 channels

Amplifier Specifications

Marine Certified
Marine certified means that the unit has been designed and manufactured with a marine use in mind. It will withstand the harsh conditions that come from marine use. Generally, they are treated against UV rays and treated with special protective coatings.
Yes
Number of Channels
Each channel on an amplifier will power one speaker using a positive and negative cable. There are various types of amplifiers, each designed to power a certain number of speakers. Monoblock amplifiers, also known as single channel, are designed to power one or more subwoofers. These amplifiers often have very high power ratings. On the other hand, multi-channel amplifiers power multiple speakers, usually at lower power ratings. 2-Channel and 4-Channel amplifiers can power car speakers or low powered subwoofers. Occasionally you might see a 5 or 6-channel amplifier that can power speakers and subwoofers at the same time. The most common setup is a monoblock amp to run subwoofers and a 4-channel amp to run door speakers. Check out our Knowledge Base for more information.
4
Total RMS Power Output
Total RMS power is measured by multiplying RMS power per channel by the number of channels, and is calculated at the lowest level of operating impedance.

RMS power is the amount of continuous power, measured in watts, that an amplifier produces is called RMS power. The higher the RMS figure, the louder and cleaner your music sounds.

The RMS output figure is much more accurate than the peak rating when comparing products.

480 watts
Maximum Input Gauge Size
This is the largest gauge wire that will fit into the power and ground terminals of this device. The lower the gauge number, the thicker the wire is. For example, a 4 gauge wire is thicker than an 8 gauge wire and thus has higher current carrying capacity. Always do your best to get this size wire to reduce the risk of damage to your components.
4 AWG
Minimum Impedance Unbridged
The lowest impedance the amplifier will handle when it is not bridged.
2 ohms
Minimum Impedance Bridged
The lowest impedance the amplifier will handle when it is bridged.
4 ohms
THD at Rated RMS Power
The amount of change in harmonic content of the signal as it is amplified. A lower figure indicates less change and a more accurate amp. THD below 0.10% is inaudible.
<0.1%
Speaker Level Inputs
Speaker level inputs are commonly referred to as high-level inputs and vice versa. This input type allows you to get your audio signal directly from the speaker wire in your vehicle, instead of using RCA cables. The advantage of this is factory integration, as most stock radios do not have RCA outputs to run amplifiers.
No
Preamp Outputs
Many amplifiers are equipped with RCA preamp outputs which pass the original music signal from the source to additional amplifiers. This is known as daisy chaining because the source connects to the first amp, and the first amp connects to the second amp, etc. The advantage to daisy chaining is you only need one 2-channel RCA cable to transfer the signal from the head-unit to the amplifier, and then one additional cable for each amp being daisy chained.
1 pair
Built-in Crossover

A crossover is a type of filtering system that permits only certain frequencies to play. A Low-Pass (LP) crossover allows only frequencies below its setting to get through which is good in the case of some subwoofers. A High-Pass(HP) filter allows frequencies above its setting to pass through, this is normally used on speakers.

When a crossover is set to FULL it means no filtering is added and the full frequency spectrum is allowed through the amplifier. Filtering is important because feeding a speaker frequencies it cannot reproduce effectively creates distortion.

Low-Pass (LP)
High-Pass (HP)
Full (AP)
High-Pass Crossover Frequency
The high-pass crossover frequency can be a fixed crossover point or a variable crossover range. A variable high-pass crossover allows you to select a specific crossover point which allows frequencies above the set crossover point to pass, while making frequencies below the set point gently or harshly roll-off, depending on the steepness of the slope.

The steepness of the roll-off slope is measured in dB/octave and refers to the rate of attenuation (lowering of volume) outside their pass bands.

50 - 500 Hz
Low-Pass Crossover Frequency
The low-pass crossover frequency is typically used for subwoofers. It can be a fixed crossover point or a variable crossover range. A variable low-pass crossover allows you to select a specific crossover point which allows frequencies below the set crossover point to pass, while making frequencies above the set point gently or harshly roll-off, depending on the steepness of the slope.

The steepness of the roll-off slope is measured in dB/octave and refers to the rate of attenuation (lowering of volume) outside their pass bands.

50 - 500 Hz
Signal-to-Noise Ratio
This spec compares the strength of the signal to the level of background noise. A higher value indicates less background noise.
>90 dB
Channel Separation
Also referred to as crosstalk. The amount of interference on one stereo channel caused by the leaking of the other stereo channel. The higher the rating in decibels (dB), the better the Channel Separation.
>60 dB
Bass/Gain Remote
If the amp comes with a bass/gain remote you will be able to control the level of your bass from your dashboard. Typically bass remotes also include a 16-20 ft. wire for installation.
No
Amp Bluetooth Connectivity
This feature will tell you if the amplifier has the capability to connect to a Bluetooth device.
Yes

Warranty and Return Policy

Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider
Manufacturer

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Product Summary

Manufacturer

Model Number

BT900.4M

UPC

611892980730

Weight

11.00lbs

Internal SKU

bt9004m

Internal Product ID

92709

Sonic Electronix Wiring Guide

Wiring Diagram Legend

Warning: The image depicted shows the resistance change when wiring multiple subwoofer terminals. Please refer to your subwoofer's owner's manual for the proper wiring of its terminals. Sonic Electronix, Inc. is not responsible for damage caused to your audio system or vehicle due to improper installation. Please call tech support at 1-877-289-7664 if you require additional assistance.

Product Name: RE Audio BT900.4M