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2003 Harley Davidson FXSTB/I Night Train

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Use our shopping filters to find the right 2/3/4-channel amp to power upgraded speakers properly.

Overview Upgrade your Speakers Add an Amplifier Digital Sound Processors Audio Installation & Accessories Dads & Grads Sale

Amps for Adding Speakers for 2003 Harley Davidson FXSTB/I Night Train

Some vehicles require an amp bypass module, a line-output converter like the NVX XLCA2 or AudioControl LC2i, or a DSP to integrate with your factory radio and avoid bass roll-off. Bass roll-off occurs when a factory radio's crossover is designed only for the original equipment speakers, resulting in a not complete signal being sent to your new aftermarket amp.

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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.
Amplifier Key Features
Amplifiers can offer a diverse array of features. If you select more than one feature, then you will view amplifiers that have ALL features selected. These include speaker-level inputs that facilitate seamless integration with factory audio systems, Bluetooth connectivity suitable for ATV/UTV or Classic vehicle setups, built-in DSPs that provide enhanced control over your audio signal, and a host of other functionalities to explore.
Amplifier Class

An amplifier increases the power of the signal being fed to it by taking energy from its power supply and matching the signal but increasing its amplitude. Amplifiers use many different methods for converting these electrical signals and have been categorized into classes.

Class A/B: Greater than 50% of the input signal is amplified while the other percentage is “off”. These amplifiers have a small amount of current flowing through the output transistors all the time which almost eliminates crossover distortion. Class A/B has great sound quality but is not as efficient as class D. These amps are most commonly used to drive speakers.

Class D: Also known as switching amplifiers, class D amps have output transistors that are completely turned “on” or “off”. This means that when the transistors are on, there is almost no voltage across them but when they are off there is significant voltage but no current flowing through it which makes these amplifiers very efficient at the cost of sound quality. These amps are most commonly used to drive subwoofers.

Other Classes: You may see classes such as GH, bD, X, FD, etc. by some manufactures. These amplifiers tend to be either class A/B, D or a hybrid of the two but with improvements to their designs that can make them more efficient or offer better sound quality.
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.
Total Peak Power Output
The total peak power output is measured as the wattage per channel multiplied by the number of channels, and is calculated at the lowest level of operating impedance.

It is measured during a brief musical burst, such as a sudden drum accent. Some manufacturers display peak power ratings on the face of their products to increase the appeal.

The RMS power rating is more accurate, and we recommend using it for product comparison.
Series
Many brands group their products into series or lines of products to help customers know the level of quality (good, better, best for example). You can filter by series and the brand using our guided browsing.
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ZXI Series (1)
Minimum Impedance Unbridged
The lowest impedance the amplifier will handle when it is not bridged.
Minimum Impedance Bridged
The lowest impedance the amplifier will handle when it is bridged.
Remote bass/level controller
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.
Sonic Certified Amplifier
Sonic Certified amplifiers have been tested by the experts at Sonic Electronix to meet or exceed the wattage ratings provided by the manufacturer. If this is marked as Yes, then you can trust the wattage ratings. If marked as No, then we have tested the amplifier and it did not meet the advertised wattage ratings. If marked as Not Tested, then the Sonic Electronix experts have not yet been able to test the amp.
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.
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.

Amp Bluetooth Connectivity
This feature will tell you if the amplifier has the capability to connect to a Bluetooth device.
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Rockford Fosgate Power T600-4 + NVX XKIT44 4 Gauge Amp Wiring Kit

600W Power Series Compact 4-Channel Class AB Car Amplifier

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Rockford Fosgate Power T600-4 + NVX XKIT44 4 Gauge Amp Wiring Kit

600W Power Series Compact 4-Channel Class AB Car Amplifier

• 100W x 4-Chan. @ 4 ohm
• 150W x 4-Chan. @ 2 ohm
• 300W x 2 chan. @ 4 ohm
• 600W x 4-Chan. Max
• NOMAD protection circuitry: thermal, overload or short protection
• MOSFET power supply
• Includes NVX XKIT44 4 Gauge Amp Wiring Kit

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107
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-19% $659.99

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• 100W x 4-Chan. @ 4 ohm
• 150W x 4-Chan. @ 2 ohm
• 300W x 2 chan. @ 4 ohm
• 600W x 4-Chan. Max
• NOMAD protection circuitry: thermal, overload or short protection
• MOSFET power supply
• Includes NVX XKIT44 4 Gauge Amp Wiring Kit

Diamond Audio HXM800.4D with NVX 8 Gauge Amp Kit

800W RMS HXM Series Class-D 4-Channel Full Range Amplifier

HXM8004D_XKIT84 big
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Diamond Audio HXM800.4D with NVX 8 Gauge Amp Kit

800W RMS HXM Series Class-D 4-Channel Full Range Amplifier

• 120 watts x 4 channel @ 4 ohm
• 200 watts x 4 channel @ 2 ohm
• Bridged: 400 watts x 2 channel @ 4 ohm
• Total RMS Power: 800 watts
• Class D 2 ohm Stable 4-Channel-Channel Amplifier
• Includes Amplifier Wiring Kit

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• 120 watts x 4 channel @ 4 ohm
• 200 watts x 4 channel @ 2 ohm
• Bridged: 400 watts x 2 channel @ 4 ohm
• Total RMS Power: 800 watts
• Class D 2 ohm Stable 4-Channel-Channel Amplifier
• Includes Amplifier Wiring Kit

JL Audio RD900/5 (Open Box, Great)

900W RMS Class D RD Series 5 Channel Car Amplifier

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JL Audio RD900/5 (Open Box, Great)

900W RMS Class D RD Series 5 Channel Car Amplifier

• 70 watts x 4 channel + 225 watts x 1 channel @ 4 ohm
• 100 watts x 4 channel + 500 watts x 1 channel @ 2 ohm
• Bridged: 200 watts x 2 channel @ 4 ohm + 500 watts x 1 channel @ 2 ohm
• Total RMS Power: 900 watts
• Class D 2 ohm Stable 5-Channel Amplifier

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• 70 watts x 4 channel + 225 watts x 1 channel @ 4 ohm
• 100 watts x 4 channel + 500 watts x 1 channel @ 2 ohm
• Bridged: 200 watts x 2 channel @ 4 ohm + 500 watts x 1 channel @ 2 ohm
• Total RMS Power: 900 watts
• Class D 2 ohm Stable 5-Channel Amplifier

NVX VAD10004 with Amplifier Wiring Kit

1000W RMS Full Range 4-Channel Amplifier

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NVX VAD10004 with Amplifier Wiring Kit

1000W RMS Full Range 4-Channel Amplifier

• RMS: 150 x 4 @ 4 ohm, 250W x 4 @ 2 ohm, Bridged 500W x 2 @ 4 ohm
• Total RMS Power: 1000W
• CEA-2006 Compliant
• Efficient Full Range Class D Design
• Includes Amplifier Wiring Kit

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• RMS: 150 x 4 @ 4 ohm, 250W x 4 @ 2 ohm, Bridged 500W x 2 @ 4 ohm
• Total RMS Power: 1000W
• CEA-2006 Compliant
• Efficient Full Range Class D Design
• Includes Amplifier Wiring Kit

Wet Sounds HTX-2 + 30% Off High Quality NVX Amp Kit

600W RMS 2-Channel HTX Series Class D Full-Range Marine Amplifier (WetSounds)

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Wet Sounds HTX-2 + 30% Off High Quality NVX Amp Kit

600W RMS 2-Channel HTX Series Class D Full-Range Marine Amplifier (WetSounds)

• 150 Watts RMS x 2 @ 4 ohm
• 300 Watts RMS x 2 @ 2 ohm
• 600 Watts RMS x 1 @ 4 ohm, Bridged
• Total Peak Power: 900 Watts RMS
• CEA-2006 Compliant
• Removable crossover/level control cover
• Conformal coated PCB boards
• Mono or 2 channel operation

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• 150 Watts RMS x 2 @ 4 ohm
• 300 Watts RMS x 2 @ 2 ohm
• 600 Watts RMS x 1 @ 4 ohm, Bridged
• Total Peak Power: 900 Watts RMS
• CEA-2006 Compliant
• Removable crossover/level control cover
• Conformal coated PCB boards
• Mono or 2 channel operation

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Rockford Fosgate Punch P300X2 + NVX Line-Output-Converter + Amp Kit

300W RMS 2-Channel Amplifier + NVX 2-Channel + 8 Gauge Amp Kit

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Rockford Fosgate Punch P300X2 + NVX Line-Output-Converter + Amp Kit

300W RMS 2-Channel Amplifier + NVX 2-Channel + 8 Gauge Amp Kit

• 100W x 2 Chan. @ 4 ohm
• 150W x 2 Chan. @ 2 ohm
• Built In NOMAD "Real Time" Analog Computer
• 2/1 Channel Operation
• 4 Gauge Power and Ground Inputs
• MESHA3 Reduces MOSFET Temperatures for Improved Durability

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118
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• 100W x 2 Chan. @ 4 ohm
• 150W x 2 Chan. @ 2 ohm
• Built In NOMAD "Real Time" Analog Computer
• 2/1 Channel Operation
• 4 Gauge Power and Ground Inputs
• MESHA3 Reduces MOSFET Temperatures for Improved Durability

Wet Sounds SYN-DX 2 + NVX 4 Gauge Marine Amp Kit

750W RMS SYN-DX Series Bridgeable Full Range 2-Channel Class D Marine Amplifier (WetSounds)

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Wet Sounds SYN-DX 2 + NVX 4 Gauge Marine Amp Kit

750W RMS SYN-DX Series Bridgeable Full Range 2-Channel Class D Marine Amplifier (WetSounds)

• 200 watts x 2 chan. @ 4 Ohm
• 375 watts x 2 chan. @ 2 Ohm
• 750 watts x 1 chan. @ 4 Ohm
• Total power output: 750 watts RMS
• Variable low-pass filter: 50 - 250 Hz, 12 dB/octave
• Variable high-pass filter: 50 - 250 Hz, 12 dB/octave
• Fuse Rating: 30 A x 3

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125
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• 200 watts x 2 chan. @ 4 Ohm
• 375 watts x 2 chan. @ 2 Ohm
• 750 watts x 1 chan. @ 4 Ohm
• Total power output: 750 watts RMS
• Variable low-pass filter: 50 - 250 Hz, 12 dB/octave
• Variable high-pass filter: 50 - 250 Hz, 12 dB/octave
• Fuse Rating: 30 A x 3

Rockford Fosgate R2-200X2 + Belva BAK42 4 Gauge Amp Kit

Prime Series 200W RMS Class D 2-Channel Amplifier + Belva 4 Gauge Wiring Kit

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Rockford Fosgate R2-200X2 + Belva BAK42 4 Gauge Amp Kit

Prime Series 200W RMS Class D 2-Channel Amplifier + Belva 4 Gauge Wiring Kit

• 50 Watts RMS x 2 @ 4 ohm
• 100 Watts RMS x 2 @ 2 ohm
• 200 Watts RMS x 1 Bridged @ 4 ohm
• CEA-2006 Compliant/Preamp Outputs/LPF
• On Board Punch EQ

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171
List price $299.98
-20% $239.99

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• 50 Watts RMS x 2 @ 4 ohm
• 100 Watts RMS x 2 @ 2 ohm
• 200 Watts RMS x 1 Bridged @ 4 ohm
• CEA-2006 Compliant/Preamp Outputs/LPF
• On Board Punch EQ

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Crunch GP-2000.4 with Belva 4 Gauge Amp Kit

Crunch 2000 Watts Ground Pounder Four Channel Car Audio Amplifier

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Crunch GP-2000.4 with Belva 4 Gauge Amp Kit

Crunch 2000 Watts Ground Pounder Four Channel Car Audio Amplifier

• Variable Electronic Crossover
• Class A/B Amplifier
• Switchable Bass Boost
• Includes Belva BAK44 4 Gauge Amp Wiring Kit

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• Variable Electronic Crossover
• Class A/B Amplifier
• Switchable Bass Boost
• Includes Belva BAK44 4 Gauge Amp Wiring Kit

Hifonics ZD-1350.4D with Amplifier Wiring Kit

1350W RMS Zeus Delta Series Class-D 4-Channel Car Amplifier

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Hifonics ZD-1350.4D with Amplifier Wiring Kit

1350W RMS Zeus Delta Series Class-D 4-Channel Car Amplifier

• 170 watts x 4 channel @ 4 ohm
• 335 watts x 4 channel @ 2 ohm
• Bridged: 675 watts x 2 channel @ 4 ohm
• Class D 2 ohm Stable 4-Channel-Channel Amplifier
• Includes Amplifier Wiring Kit

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61
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-39% $199.99

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• 170 watts x 4 channel @ 4 ohm
• 335 watts x 4 channel @ 2 ohm
• Bridged: 675 watts x 2 channel @ 4 ohm
• Class D 2 ohm Stable 4-Channel-Channel Amplifier
• Includes Amplifier Wiring Kit

Crunch DR-1325.4D with Belva 4 Gauge Amp Kit

1325W Peak Class D V-Drive Series 4-Channel Full Range Car Amplifier

DR13254D_BAK44 big
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Crunch DR-1325.4D with Belva 4 Gauge Amp Kit

1325W Peak Class D V-Drive Series 4-Channel Full Range Car Amplifier

• 165 watts x 4 channel @ 4 ohm
• 330 watts x 4 channel @ 2 ohm
• Bridged: 660 watts x 2 channel @ 4 ohm
• Total peak power output: 1325 watts
• Class D 2 ohm Stable 4-Channel-Channel Amplifier
• Includes Amplifier Wiring Kit

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61
List price $216.98
-25% $163.49

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• 165 watts x 4 channel @ 4 ohm
• 330 watts x 4 channel @ 2 ohm
• Bridged: 660 watts x 2 channel @ 4 ohm
• Total peak power output: 1325 watts
• Class D 2 ohm Stable 4-Channel-Channel Amplifier
• Includes Amplifier Wiring Kit

Deaf Bonce MFA 4.180 with Belva 4 Gauge Amp Kit

1080W RMS Machete Series Class D 4-Channel Car Amplifier

MFA4180_BAK44 big
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Deaf Bonce MFA 4.180 with Belva 4 Gauge Amp Kit

1080W RMS Machete Series Class D 4-Channel Car Amplifier

• 180 watts x 4 channel @ 4 ohm
• 270 watts x 4 channel @ 2 ohm
• Bridged: 540 watts x 2 channel @ 4 ohm
• Total RMS Power: 1080 watts
• Class D 2 ohm Stable 4-Channel Amplifier
• Includes Amplifier Wiring Kit

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61
List price $339.89
-13% $294.89

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• 180 watts x 4 channel @ 4 ohm
• 270 watts x 4 channel @ 2 ohm
• Bridged: 540 watts x 2 channel @ 4 ohm
• Total RMS Power: 1080 watts
• Class D 2 ohm Stable 4-Channel Amplifier
• Includes Amplifier Wiring Kit

Deaf Bonce MFA 2.220 with Belva 4 Gauge Amp Kit

700W RMS Class D Machete Series 2-Channel Full Range Car Amplifier

MFA2220_BAK42 big
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Deaf Bonce MFA 2.220 with Belva 4 Gauge Amp Kit

700W RMS Class D Machete Series 2-Channel Full Range Car Amplifier

• 220 watts x 2 channel @ 4 ohm
• 350 watts x 2 channel @ 2 ohm
• Bridged: 700 watts x 1 channel @ 4 ohm
• Total RMS Power: 700 watts
• Class D 2 ohm Stable 2-Channel-Channel Amplifier

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169
List price $249.89
-14% $214.39

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• 220 watts x 2 channel @ 4 ohm
• 350 watts x 2 channel @ 2 ohm
• Bridged: 700 watts x 1 channel @ 4 ohm
• Total RMS Power: 700 watts
• Class D 2 ohm Stable 2-Channel-Channel Amplifier

DS18 SXE-3000.4D/BK (Black) with Belva 4 Gauge Amp Kit

3000W Peak (1000W RMS) Class D SXE Series 4-Channel Car Amplifier

SXE30004DBK_BAK44 big
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DS18 SXE-3000.4D/BK (Black) with Belva 4 Gauge Amp Kit

3000W Peak (1000W RMS) Class D SXE Series 4-Channel Car Amplifier

• 200 watts x 4 channel @ 4 ohm
• 320 watts x 4 channel @ 2 ohm
• Bridged: 500 watts x 2 channel @ 4 ohm
• Total RMS Power: 1,000 watts
• Class D 2 ohm Stable 4-Channel-Channel Amplifier (Black)
• Includes Amplifier Wiring Kit

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61
List price $367.94
-12% $322.94

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• 200 watts x 4 channel @ 4 ohm
• 320 watts x 4 channel @ 2 ohm
• Bridged: 500 watts x 2 channel @ 4 ohm
• Total RMS Power: 1,000 watts
• Class D 2 ohm Stable 4-Channel-Channel Amplifier (Black)
• Includes Amplifier Wiring Kit

Rockford Fosgate R2-300X4 with NVX 4 Gauge Amp Kit

300W RMS Prime Series Class D 4-Channel Amplifier

R2300X4_XKIT44 big
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Rockford Fosgate R2-300X4 with NVX 4 Gauge Amp Kit

300W RMS Prime Series Class D 4-Channel Amplifier

• 50 watts x 4 channel @ 4 ohm
• 75 watts x 4 channel @ 2 ohm
• Bridged: 150 watts x 2 channel @ 4 ohm
• Total RMS Power: 300 watts
• Class D 2 ohm Stable 4-Channel Amplifier
• Includes Amplifier Wiring Kit

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• 50 watts x 4 channel @ 4 ohm
• 75 watts x 4 channel @ 2 ohm
• Bridged: 150 watts x 2 channel @ 4 ohm
• Total RMS Power: 300 watts
• Class D 2 ohm Stable 4-Channel Amplifier
• Includes Amplifier Wiring Kit

Cerwin Vega SRPM700.4DW with NVX 8 Gauge Amp Kit

700W RMS Class-D 4-Channel 2-Ohm Stable Marine Amplifier - White

SRPM700.4DW, XKIT84 big
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Cerwin Vega SRPM700.4DW with NVX 8 Gauge Amp Kit

700W RMS Class-D 4-Channel 2-Ohm Stable Marine Amplifier - White

• 100 Watts RMS x 4 @ 4 ohm
• 150 Watts RMS x 4 @ 2 ohm
• Conformal Coating Protects Against Moisture
• Aluminum Heatsink
• Includes Amplifier Wiring Kit

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List price $623.98
-31% $429.99

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• 100 Watts RMS x 4 @ 4 ohm
• 150 Watts RMS x 4 @ 2 ohm
• Conformal Coating Protects Against Moisture
• Aluminum Heatsink
• Includes Amplifier Wiring Kit

Rockford Fosgate Punch PM600X4 + FREE $100 Gift Card

600W 4-Channel Punch Series Class AB Marine Amplifier

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Rockford Fosgate Punch PM600X4 + FREE $100 Gift Card

600W 4-Channel Punch Series Class AB Marine Amplifier

• RMS: 75W x 4 @ 4 ohm, 150W x 4 @ 2 ohm, Bridged 300W x 2 @ 4ohm
• CEA-2006 Compliant
• Features C.L.E.A.N. Set-up
• Protected against Dust, UV, & Corrosion
• Marine grade two part epoxy coating on circuit boards

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• RMS: 75W x 4 @ 4 ohm, 150W x 4 @ 2 ohm, Bridged 300W x 2 @ 4ohm
• CEA-2006 Compliant
• Features C.L.E.A.N. Set-up
• Protected against Dust, UV, & Corrosion
• Marine grade two part epoxy coating on circuit boards

Infinity Reference 7005A (AMPRF7005AAM) + Free NVX Premium Amp Kit

Reference Series High Performance Class AB+D 5-Channel Amplifier + XKIT46

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Infinity Reference 7005A (AMPRF7005AAM) + Free NVX Premium Amp Kit

Reference Series High Performance Class AB+D 5-Channel Amplifier + XKIT46

• 5-Channel Amplifier
• Phase Switch on Sub Channel
• Full Board Protection
• Variable High and Low Pass Filter
• Class AB + D Technology

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• 5-Channel Amplifier
• Phase Switch on Sub Channel
• Full Board Protection
• Variable High and Low Pass Filter
• Class AB + D Technology

Diamond Audio DMD600.4D with NVX 8 Gauge Amp Kit

600W RMS DMD Series Class-D 4-Channel Amplifier

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Diamond Audio DMD600.4D with NVX 8 Gauge Amp Kit

600W RMS DMD Series Class-D 4-Channel Amplifier

• 150 watts x 4 channel @ 4 ohm
• 100 watts x 4 channel @ 2 ohm
• Bridged: 320 watts x 2 channel @ 4 ohm
• Total RMS Power: 600 watts
• Class D 2 ohm Stable 4-Channel-Channel Amplifier
• Includes Amplifier Wiring Kit

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39
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-11% $449.98

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• 150 watts x 4 channel @ 4 ohm
• 100 watts x 4 channel @ 2 ohm
• Bridged: 320 watts x 2 channel @ 4 ohm
• Total RMS Power: 600 watts
• Class D 2 ohm Stable 4-Channel-Channel Amplifier
• Includes Amplifier Wiring Kit

Hertz HCP 4M with Free Premium NVX 4 Gauge Amp Kit

Class-D 4-Channel 2 Ohms Marine Stereo Amplifier

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Hertz HCP 4M with Free Premium NVX 4 Gauge Amp Kit

Class-D 4-Channel 2 Ohms Marine Stereo Amplifier

• 65 Watts RMS x 4 @ 4 ohm
• 95 Watts RMS x 4 @ 2 ohm
• CEA-2006 Compliant/Preamp Outputs/LPF
• Corrosion Protection
• Water jet tested
• Dimensions: 12.40" x 7.48" x 1.97"

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• 65 Watts RMS x 4 @ 4 ohm
• 95 Watts RMS x 4 @ 2 ohm
• CEA-2006 Compliant/Preamp Outputs/LPF
• Corrosion Protection
• Water jet tested
• Dimensions: 12.40" x 7.48" x 1.97"

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    FAQ for Multi-channel Amplifiers for Adding Speakers in 2003 FXSTB/I Night Train

    Q: Can I upgrade or change the Multi-channel Amplifiers for Adding Speakers in 2003 Harley Davidson FXSTB/I Night Train?

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