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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.

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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.
Punch Series (32)
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Marine V Series (7)
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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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Cerwin Vega SRPM700.2D with NVX 8 Gauge Amp Kit

700W RMS Stroker RPM Series Class-D 2-Channel Marine Amplifier with Bass Remote

SRPM7002D_XKIT82 big
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Cerwin Vega SRPM700.2D with NVX 8 Gauge Amp Kit

700W RMS Stroker RPM Series Class-D 2-Channel Marine Amplifier with Bass Remote

• 200 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 Amplifier
• Includes Amplifier Wiring Kit

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-34% $309.99

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• 200 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 Amplifier
• Includes Amplifier Wiring Kit

Deaf Bonce MFA 4.320 with NVX 4 Gauge Amp Kit

1920W RMS Machete Series Class D 4-Channel Amplifier

MFA4320_XKIT44 big
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Deaf Bonce MFA 4.320 with NVX 4 Gauge Amp Kit

1920W RMS Machete Series Class D 4-Channel Amplifier

• 320 watts x 4 channel @ 4 ohm
• 480 watts x 4 channel @ 2 ohm
• Bridged: 960 watts x 2 channel @ 4 ohm
• Total RMS Power: 1920 watts
• Class D 2 ohm Stable 4-Channel Amplifier
• Includes Amplifier Wiring Kit

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• 320 watts x 4 channel @ 4 ohm
• 480 watts x 4 channel @ 2 ohm
• Bridged: 960 watts x 2 channel @ 4 ohm
• Total RMS Power: 1920 watts
• Class D 2 ohm Stable 4-Channel Amplifier
• Includes Amplifier Wiring Kit

Diamond Audio MICRO2V2 with NVX 8 Gauge Amp Kit

500W RMS Micro Series Class-D 2-Channel Amplifier

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Diamond Audio MICRO2V2 with NVX 8 Gauge Amp Kit

500W RMS Micro Series Class-D 2-Channel Amplifier

• 150 watts x 2 channel @ 4 ohm
• 250 watts x 2 channel @ 2 ohm
• Bridged: 500 watts x 1 channel @ 4 ohm
• Total RMS Power: 500 watts
• Class D 2 ohm Stable 2-Channel-Channel Amplifier
• Includes Amplifier Wiring Kit

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60
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• 150 watts x 2 channel @ 4 ohm
• 250 watts x 2 channel @ 2 ohm
• Bridged: 500 watts x 1 channel @ 4 ohm
• Total RMS Power: 500 watts
• Class D 2 ohm Stable 2-Channel-Channel Amplifier
• Includes Amplifier Wiring Kit

DS18 NVY-IPX7.4 with NVX 8 Gauge Amp Kit

1440W Peak (700W RMS) Class D 4-Channel IP67 Waterproof Marine and Powersports Amplifier with Input Selector

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DS18 NVY-IPX7.4 with NVX 8 Gauge Amp Kit

1440W Peak (700W RMS) Class D 4-Channel IP67 Waterproof Marine and Powersports Amplifier with Input Selector

• 120 watts x 4 channel @ 4 ohm
• 200 watts x 4 channel @ 2 ohm
• Bridged: 350 watts x 2 channel @ 4 ohm
• Total RMS Power: 700 watts
• IP67 waterproof rating, with UV, salt and fog protection
• Class D 2 ohm Stable 4-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: 350 watts x 2 channel @ 4 ohm
• Total RMS Power: 700 watts
• IP67 waterproof rating, with UV, salt and fog protection
• Class D 2 ohm Stable 4-Channel Amplifier
• Includes Amplifier Wiring Kit

Infinity DSP4425 (INFDSP4425AM) with NVX 8 Gauge Amp Kit

200W Peak (140W RMS) DSP Series Class-AB 4-Channel Amplifier with Digital Signal Processing

INFDSP4425AM_XKIT84 big
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Infinity DSP4425 (INFDSP4425AM) with NVX 8 Gauge Amp Kit

200W Peak (140W RMS) DSP Series Class-AB 4-Channel Amplifier with Digital Signal Processing

• 25 watts x 4 channel @ 4 ohm
• 35 watts x 2 channel @ 2 ohm
• Total RMS Power: 140 watts
• Class A/B 2 ohm Stable 4-Channel Amplifier
• Includes Amplifier Wiring Kit

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• 25 watts x 4 channel @ 4 ohm
• 35 watts x 2 channel @ 2 ohm
• Total RMS Power: 140 watts
• Class A/B 2 ohm Stable 4-Channel Amplifier
• Includes Amplifier Wiring Kit

JBL Club A754 with NVX 8 Gauge Amp Kit

400W RMS Club Series Class-H Compact 4-Channel Amplifier

CLUBA754_XKIT84 big
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JBL Club A754 with NVX 8 Gauge Amp Kit

400W RMS Club Series Class-H Compact 4-Channel Amplifier

• 75 watts x 4 channel @ 4 ohm
• 100 watts x 4 channel @ 2 ohm
• Bridged: 200 watts x 2 channel @ 4 ohm
• Total RMS Power: 400 watts
• Class H 2 ohm Stable 4-Channel Amplifier
• Includes Amplifier Wiring Kit

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• 75 watts x 4 channel @ 4 ohm
• 100 watts x 4 channel @ 2 ohm
• Bridged: 200 watts x 2 channel @ 4 ohm
• Total RMS Power: 400 watts
• Class H 2 ohm Stable 4-Channel Amplifier
• Includes Amplifier Wiring Kit

Kenwood eXcelon XM302-4 with NVX 4 Gauge Amp Kit

300W RMS XR Series Class-D 4-Channel Marine Amplifier

XM3024_XKIT44 big
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Kenwood eXcelon XM302-4 with NVX 4 Gauge Amp Kit

300W RMS XR Series Class-D 4-Channel Marine 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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-37% $383.17

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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

MTX Audio MUD100.4with NVX 8 Gauge Amp Kit

400W Peak (200W RMS) Mud Series Class-D 4-Channel Compact Marine Amplifier for Outdoor Powersports

MUD1004_XKIT84 big
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MTX Audio MUD100.4with NVX 8 Gauge Amp Kit

400W Peak (200W RMS) Mud Series Class-D 4-Channel Compact Marine Amplifier for Outdoor Powersports

• 50 Watts RMS x 4 @ 4 ohm
• 100 Watts RMS x 4 @ 2 ohm
• Total Peak Power: 800 Watts
• Selectable Front high-pass filter: 80 / 200 Hz
• Speaker-level (high-level) inputs
• Includes Amplifier Wiring Kit

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-18% $399.94

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• 50 Watts RMS x 4 @ 4 ohm
• 100 Watts RMS x 4 @ 2 ohm
• Total Peak Power: 800 Watts
• Selectable Front high-pass filter: 80 / 200 Hz
• Speaker-level (high-level) inputs
• Includes Amplifier Wiring Kit

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Rockford Fosgate PBR400X4D with NVX 8 Gauge Amp Kit

400W RMS Punch Series Class-D 4-Channel Amplifier

PBR400X4D_XKIT84 big
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Rockford Fosgate PBR400X4D with NVX 8 Gauge Amp Kit

400W RMS Punch Series Class-D 4-Channel Amplifier

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

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List price $417.98
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• 50 watts x 4 channel @ 4 ohm
• 100 watts x 4 channel @ 2 ohm
• Bridged: 200 watts x 2 channel @ 4 ohm
• Total RMS Power: 400 watts
• Class D 2 ohm Stable 4-Channel Amplifier
• Includes Amplifier Wiring Kit

JL Audio XDM400/4 (Open Box, Great)

400W RMS XDM Series Class D 4 Channel Car/Marine Amplifier

XDM400/4 big
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JL Audio XDM400/4 (Open Box, Great)

400W RMS XDM Series Class D 4 Channel Car/Marine Amplifier

• 75 watts x 4 channel @ 4 ohm
• 100 watts x 4 channel @ 2 ohm
• Bridged: 200 watts x 2 channel @ 4 ohm
• Total RMS Power: 400 watts
• Class D 2 ohm Stable 4-Channel Amplifier

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List price $679.99
-20% $543.99

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• 75 watts x 4 channel @ 4 ohm
• 100 watts x 4 channel @ 2 ohm
• Bridged: 200 watts x 2 channel @ 4 ohm
• Total RMS Power: 400 watts
• Class D 2 ohm Stable 4-Channel Amplifier

Hertz HCP5D with NVX 8 Gauge Amp Kit

Class D 5-Channel Car Subwoofer Amplifier

HCP5D_XKIT86 big
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Hertz HCP5D with NVX 8 Gauge Amp Kit

Class D 5-Channel Car Subwoofer Amplifier

• 150 Watts RMS x 4 + 200 Watts x 1 @ 4 ohm
• 250 Watts RMS x 4 + 300 Watts x 1 @ 2 ohm
• CEA-2006 Compliant
• Refined Heatsink with High Convection Capability
• Automatic Remote Turn-On/Off function
• Dimensions: 13.58" x 7.48" x 1.97"
• Includes Amplifier Wiring Kit

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82
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-15% $615.07

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• 150 Watts RMS x 4 + 200 Watts x 1 @ 4 ohm
• 250 Watts RMS x 4 + 300 Watts x 1 @ 2 ohm
• CEA-2006 Compliant
• Refined Heatsink with High Convection Capability
• Automatic Remote Turn-On/Off function
• Dimensions: 13.58" x 7.48" x 1.97"
• Includes Amplifier Wiring Kit

Kenwood eXcelon XM802-5 with Amplifier Wiring Kit

1600W Peak (800W RMS) Class D 5-Channel Car Audio Amplifier

XM8025, BAK46 big
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Kenwood eXcelon XM802-5 with Amplifier Wiring Kit

1600W Peak (800W RMS) Class D 5-Channel Car Audio Amplifier

• 75 watts x 4 channel + 300 watts x 1 channel @ 4 ohm
• 75 watts x 4 channel + 500 watts x 1 channel @ 2 ohm
• Bridged: 150 watts x 2 channel @ 4 ohm + 500 watts x 1 channel @ 2 ohm
• Total RMS Power: 800 watts
• CEA-2006 Compliant
• Class D 2 ohm Stable 5-Channel Amplifier
• Includes Amplifier Wiring Kit

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• 75 watts x 4 channel + 300 watts x 1 channel @ 4 ohm
• 75 watts x 4 channel + 500 watts x 1 channel @ 2 ohm
• Bridged: 150 watts x 2 channel @ 4 ohm + 500 watts x 1 channel @ 2 ohm
• Total RMS Power: 800 watts
• CEA-2006 Compliant
• Class D 2 ohm Stable 5-Channel Amplifier
• Includes Amplifier Wiring Kit

Lowest price in 30 days

DS18 SMD-300.4AB with NVX 1/0 Gauge Amp Kit

1200W RMS Class AB SMD Series 4 Channel Car Amplifier with Bass Remote

SMD3004AB_XKIT04 big Out of stock
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DS18 SMD-300.4AB with NVX 1/0 Gauge Amp Kit

1200W RMS Class AB SMD Series 4 Channel Car Amplifier with Bass Remote

• 200 watts x 4 channel @ 4 ohm
• 300 watts x 4 channel @ 2 ohm
• Bridged: 600 watts x 2 channel @ 4 ohm
• Total RMS Power: 1200 watts
• Class A/B 2 ohm Stable 4-Channel Amplifier
• Includes Amplifier Wiring Kit

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List price $821.93
-13% $717.91
Add to Cart

• 200 watts x 4 channel @ 4 ohm
• 300 watts x 4 channel @ 2 ohm
• Bridged: 600 watts x 2 channel @ 4 ohm
• Total RMS Power: 1200 watts
• Class A/B 2 ohm Stable 4-Channel Amplifier
• Includes Amplifier Wiring Kit

Audio Control ACX-300.4 + NVX XKIT84 8 Gauge Amp Wiring Kit

300 Watt Marine 4-Channel Amplifier + NVX Premium Wiring Kit

ACX-300.4, XKIT84 big
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Audio Control ACX-300.4 + NVX XKIT84 8 Gauge Amp Wiring Kit

300 Watt Marine 4-Channel Amplifier + NVX Premium Wiring Kit

• 300 Watts @ 2 Ohm
• 175 Watts @ 4 Ohm
• 4/3/2 Channel Amplifier

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List price $566.99
-49% $289.00

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• 300 Watts @ 2 Ohm
• 175 Watts @ 4 Ohm
• 4/3/2 Channel Amplifier

MB Quart NA3-600.6 with NVX 8 Gauge Amp Kit

Nautic Marine 600 Watt 6 Channel Marine Amplifier

NA36006_XKIT86 big
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MB Quart NA3-600.6 with NVX 8 Gauge Amp Kit

Nautic Marine 600 Watt 6 Channel Marine Amplifier

• 50 Watts Peak x 6
• 100 Watts Peak x 6 @ 2 ohm
• Total Peak Power: 600 Watts
• CEA-2006 Compliant
• NMMA Certified
• Audiophile Marine Standard
• LED system protection circuit diagnostics
• Class SQ
• Includes Amplifier Wiring Kit

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• 50 Watts Peak x 6
• 100 Watts Peak x 6 @ 2 ohm
• Total Peak Power: 600 Watts
• CEA-2006 Compliant
• NMMA Certified
• Audiophile Marine Standard
• LED system protection circuit diagnostics
• Class SQ
• Includes Amplifier Wiring Kit

Cerwin Vega S9500.2D Amplifier + Free $100 Gift Card

Stroker Series 500W RMS 2-Channel Amplifier

S9500.2D, 100EGIFT big
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Cerwin Vega S9500.2D Amplifier + Free $100 Gift Card

Stroker Series 500W RMS 2-Channel Amplifier

• 4/2/1 ohm: 250 watts x 2 chan.
• Bridged, 4/2 ohm: 700 x 1 chan.
• Class-D 2-channel 4-Ohm Amplifier
• Frequency Response: 10Hz ~ 35KHz
• Crossover 35Hz – 350Hz

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List price $459.99
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• 4/2/1 ohm: 250 watts x 2 chan.
• Bridged, 4/2 ohm: 700 x 1 chan.
• Class-D 2-channel 4-Ohm Amplifier
• Frequency Response: 10Hz ~ 35KHz
• Crossover 35Hz – 350Hz

Rockford Fosgate PM400X4 + NVX XFLOC4 Line-Output-Converter + Amp Kit

400W 4-Channel Marine Amplifier + NVX 4-Channel L.O.C + Amp Kit

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Rockford Fosgate PM400X4 + NVX XFLOC4 Line-Output-Converter + Amp Kit

400W 4-Channel Marine Amplifier + NVX 4-Channel L.O.C + Amp Kit

• RMS: 50 watts x 4 chan. @ 4 ohm, 100 watts x 4 chan. @ 2 ohm, Bridged 200 watts x 2 chan. @ 4 ohm
• 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: 50 watts x 4 chan. @ 4 ohm, 100 watts x 4 chan. @ 2 ohm, Bridged 200 watts x 2 chan. @ 4 ohm
• 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

American Bass DB675.2FR with Belva 8 Gauge Amp Kit

500W Peak (220W RMS) DB Series Class-AB 2-Channel Amplifier

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American Bass DB675.2FR with Belva 8 Gauge Amp Kit

500W Peak (220W RMS) DB Series Class-AB 2-Channel Amplifier

• 75 watts x 2 channel @ 4 ohm
• 130 watts x 2 channel @ 2 ohm
• Bridged: 220 watts x 1 channel @ 4 ohm
• Total RMS Power: 220 watts
• Class A/B 2 ohm Stable 2-Channel Amplifier
• Includes Amplifier Wiring Kit

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-32% $127.16

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• 75 watts x 2 channel @ 4 ohm
• 130 watts x 2 channel @ 2 ohm
• Bridged: 220 watts x 1 channel @ 4 ohm
• Total RMS Power: 220 watts
• Class A/B 2 ohm Stable 2-Channel Amplifier
• Includes Amplifier Wiring Kit

Cerwin Vega S9500.2D with NVX 8 Gauge Amp Kit

500W RMS Stroker Series Class-D 2-Channel Amplifier with Bass Remote

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Cerwin Vega S9500.2D with NVX 8 Gauge Amp Kit

500W RMS Stroker Series Class-D 2-Channel Amplifier with Bass Remote

• 200 watts x 2 channel @ 4 ohm
• 250 watts x 2 channel @ 2 ohm
• Bridged: 500 watts x 2 channel @ 4 ohm
• Total RMS Power: 500 watts
• Class D 2 ohm Stable 2-Channel Amplifier
• Includes Amplifier Wiring Kit

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• 200 watts x 2 channel @ 4 ohm
• 250 watts x 2 channel @ 2 ohm
• Bridged: 500 watts x 2 channel @ 4 ohm
• Total RMS Power: 500 watts
• Class D 2 ohm Stable 2-Channel Amplifier
• Includes Amplifier Wiring Kit

Alpine R-A90S - Open Box, Great

R Series 6/5/4/3 Channel Power Amplifier

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Alpine R-A90S - Open Box, Great

R Series 6/5/4/3 Channel Power Amplifier

• 75 watts x 4 channel + 150 watts x 2 channel @ 4 ohm
• 100 watts x 4 channel + 250 watts x 2 channel @ 2 ohm
• Bridged: 200 watts x 2 channel @ 4 ohm + 500 watts x 1 channel @ 4 ohm
• Total RMS Power: 900 watts
• Class D 2 ohm Stable 6-Channel-Channel Amplifier

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• 75 watts x 4 channel + 150 watts x 2 channel @ 4 ohm
• 100 watts x 4 channel + 250 watts x 2 channel @ 2 ohm
• Bridged: 200 watts x 2 channel @ 4 ohm + 500 watts x 1 channel @ 4 ohm
• Total RMS Power: 900 watts
• Class D 2 ohm Stable 6-Channel-Channel Amplifier

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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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