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2005 BMW X3

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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 Stereo Upgrade your Speakers Add a Subwoofer Add an Amplifier Digital Sound Processors Audio Installation & Accessories Add a Backup Camera Dads & Grads Sale

Amps for Adding Speakers for 2005 BMW X3

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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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.
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.
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.
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.
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.

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.
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.
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Hertz SP 4.500 with NVX 8 Gauge Amp Kit

600W RMS SPL Show Series Class-D 4-3- 2-Channel Amplifier

SP4500_XKIT84 big
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Hertz SP 4.500 with NVX 8 Gauge Amp Kit

600W RMS SPL Show Series Class-D 4-3- 2-Channel Amplifier

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

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-26% $449.99

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

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

Hifonics ZD-1350.4D with Amplifier Wiring Kit

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

ZD-1350.4D, BAK44 big
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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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-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 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
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-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

Deaf Bonce MFA 2.520 with Belva 4 Gauge Amp Kit

1500W RMS Class D Machete Series 2-Channel Full Range Car Amplifier

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Deaf Bonce MFA 2.520 with Belva 4 Gauge Amp Kit

1500W RMS Class D Machete Series 2-Channel Full Range Car Amplifier

• 520 watts x 2 channel @ 4 ohm
• 750 watts x 2 channel @ 2 ohm
• Bridged: 1500 watts x 1 channel @ 4 ohm
• Total RMS Power: 1500 watts
• Class D 2 ohm Stable 2-Channel-Channel Amplifier

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171
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• 520 watts x 2 channel @ 4 ohm
• 750 watts x 2 channel @ 2 ohm
• Bridged: 1500 watts x 1 channel @ 4 ohm
• Total RMS Power: 1500 watts
• Class D 2 ohm Stable 2-Channel-Channel Amplifier

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

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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• 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

HCP4M, XKIT44 big
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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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Rockford Fosgate P500X2 with Amplifier Wiring Kit

500W RMS 2-Channel Amplifier (P500X.2) with NVX 8 Gauge Amplifier Wiring Kit

P500X2, XKIT82 big
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Rockford Fosgate P500X2 with Amplifier Wiring Kit

500W RMS 2-Channel Amplifier (P500X.2) with NVX 8 Gauge Amplifier Wiring Kit

• 150W x 2 Chan. @ 4 ohm
• 250W 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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-18% $429.98

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• 150W x 2 Chan. @ 4 ohm
• 250W 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

Rockford Fosgate Power TM400X4ad with Amplifier Wiring Kit

400W Power Series Class-AD Marine 4-Channel Amplifier

TM400X4ad, XKIT84 big
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Rockford Fosgate Power TM400X4ad with Amplifier Wiring Kit

400W Power Series Class-AD Marine 4-Channel Amplifier

• RMS: 100 watts x 4 chan. @ 4 ohm, 100 watts x 4 chan. @ 2 ohm, 200 watts x 2 chan. @ 4 ohm Bridged
• CEA-2006 Compliant Amplifier
• Rockford Fosgate 4/2 Ohm muti-impedance Constant Power technology
•Differential inputs with high level auto turn-on feature
• C.L.E.A.N. input/output clip detection and indicator LEDs
• 4-layer 2oz. copper circuit board with 2-part epoxy coating

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-6% $694.99

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• RMS: 100 watts x 4 chan. @ 4 ohm, 100 watts x 4 chan. @ 2 ohm, 200 watts x 2 chan. @ 4 ohm Bridged
• CEA-2006 Compliant Amplifier
• Rockford Fosgate 4/2 Ohm muti-impedance Constant Power technology
•Differential inputs with high level auto turn-on feature
• C.L.E.A.N. input/output clip detection and indicator LEDs
• 4-layer 2oz. copper circuit board with 2-part epoxy coating

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

MTX WET75.4 with NVX 4 Gauge Amp Kit

200W Peak (100W RMS) Wet Series 4-Channel All Weather Class A/B Marine/Powersports Compact Amplifier

WET754_XKIT44 big
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MTX WET75.4 with NVX 4 Gauge Amp Kit

200W Peak (100W RMS) Wet Series 4-Channel All Weather Class A/B Marine/Powersports Compact Amplifier

• RMS Power: 75W x 4 @ 4 ohm, 100W x 4 @ 2 ohm
• Total Peak Power: 400W
• Plastic Cover Over Control-Adjustments
• Dimensions: 12.15"W x 6.40"L x 2.25"H
• Includes Amplifier Wiring Kit

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• RMS Power: 75W x 4 @ 4 ohm, 100W x 4 @ 2 ohm
• Total Peak Power: 400W
• Plastic Cover Over Control-Adjustments
• Dimensions: 12.15"W x 6.40"L x 2.25"H
• Includes Amplifier Wiring 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

P300X2, XLCA2, BAK82 big
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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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• 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

Hertz HCP2 + Belva BAK42

400W Class AB 2-Channel Car Audio Subwoofer Amplifier + Belva 4 Gauge Amp Wiring kit

HCP 2, BAK42 big
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Hertz HCP2 + Belva BAK42

400W Class AB 2-Channel Car Audio Subwoofer Amplifier + Belva 4 Gauge Amp Wiring kit

• 65 Watts RMS x 2 @ 4 ohm
• 100 Watts RMS x 2 @ 2 ohm
• CEA-2006 Compliant
• Refined Heatsink with High Convection Capability
• Automatic Remote Turn-On/Off function
• Dimensions: 8.46" x 7.48" x 1.97"

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• 65 Watts RMS x 2 @ 4 ohm
• 100 Watts RMS x 2 @ 2 ohm
• CEA-2006 Compliant
• Refined Heatsink with High Convection Capability
• Automatic Remote Turn-On/Off function
• Dimensions: 8.46" x 7.48" x 1.97"

Rockford Fosgate Punch PM300X2 + NVX XKIT42

300W Punch Series Class A/B 2-Channel Marine Amplifier + NVX 4 Gauge Amp Wiring Kit

PM300X2, XKIT42 big
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Rockford Fosgate Punch PM300X2 + NVX XKIT42

300W Punch Series Class A/B 2-Channel Marine Amplifier + NVX 4 Gauge Amp Wiring Kit

• RMS: 100 watts x 2 chan. @ 4 ohm, 150 watts x 2 chan. @ 2 ohm, 300 watts x 1 chan. @ 4 ohm Bridged
• 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: 100 watts x 2 chan. @ 4 ohm, 150 watts x 2 chan. @ 2 ohm, 300 watts x 1 chan. @ 4 ohm Bridged
• 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

Crunch PZ2-2030.2D with Amplifier Wiring Kit

1000W RMS Powerzone 2 Series Class-D 2-Channel Car Amplifier Package

PZ2-2030.2D, BAK42 big
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Crunch PZ2-2030.2D with Amplifier Wiring Kit

1000W RMS Powerzone 2 Series Class-D 2-Channel Car Amplifier Package

• 4 ohm: 2 x 500
• 2 ohm: 2 x 1000
• 4 ohm: 1 x 2000
• Total RMS Power: 2000 watts
• Class D 2 ohm Stable 2-Channel-Channel Amplifier
• Includes Amplifier Wiring Kit

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• 4 ohm: 2 x 500
• 2 ohm: 2 x 1000
• 4 ohm: 1 x 2000
• Total RMS Power: 2000 watts
• Class D 2 ohm Stable 2-Channel-Channel Amplifier
• Includes Amplifier Wiring Kit

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Rockford Fosgate Punch P300X2 with Amplifier Wiring Kit

300W RMS Punch Series 2-Channel Stereo Class AB Car Power Amplifier (P300X.2)

P300X2, XKIT42 big
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Rockford Fosgate Punch P300X2 with Amplifier Wiring Kit

300W RMS Punch Series 2-Channel Stereo Class AB Car Power Amplifier (P300X.2)

• 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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-22% $332.48

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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

Rockford Fosgate Power T1000-4AD with Amplifier Wiring Kit

1000W 4-Channel Class AD Power Series Constant Power Amplifier

T1000-4AD, XKIT44 big
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Rockford Fosgate Power T1000-4AD with Amplifier Wiring Kit

1000W 4-Channel Class AD Power Series Constant Power Amplifier

• 1000W RMS
• 250W x 4-Chan @ 4 Ohm
• NOMAD Real Time Computer Protection
• 50-500 Hz LP/AP/HP Crossovers
• Constant Power

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• 1000W RMS
• 250W x 4-Chan @ 4 Ohm
• NOMAD Real Time Computer Protection
• 50-500 Hz LP/AP/HP Crossovers
• Constant Power

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    FAQ for Multi-channel Amplifiers for Adding Speakers in 2005 X3

    Q: Can I upgrade or change the Multi-channel Amplifiers for Adding Speakers in 2005 BMW X3?

    A: Yes this page includes all the best Multi-channel Amplifiers for Adding Speakers that work in your X3.

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    Modern vehicles often require specific brackets, wiring harnesses, and mounting solutions. A fit guide ensures:

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