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1987 BMW 325e

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Single, 1-channel monoblock sub amplifiers for when you add a sub

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

Amplifiers for Powering a Sub for 1987 BMW 325e

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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Cerwin Vega S9750.1D with Amplifier Wiring Kit

Stroker Series 750W RMS Monoblock Amplifier + NVX XKIT42 4 Gauge Amp Wiring Kit

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Cerwin Vega S9750.1D with Amplifier Wiring Kit

Stroker Series 750W RMS Monoblock Amplifier + NVX XKIT42 4 Gauge Amp Wiring Kit

• 2/1 ohm: 750 watts x 1 chan.
• Class-D Monoblock 2-Ohm Amplifier
• Handles Hi and Low Level Input Up to 12V
• Fully Variable 35Hz - 350Hz 12dB Per Octave Crossovers
• Frequency Response: 10Hz ~ 350Hz (-3dB)

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• 2/1 ohm: 750 watts x 1 chan.
• Class-D Monoblock 2-Ohm Amplifier
• Handles Hi and Low Level Input Up to 12V
• Fully Variable 35Hz - 350Hz 12dB Per Octave Crossovers
• Frequency Response: 10Hz ~ 350Hz (-3dB)

Alpine HDA-M80 with NVX 4 Gauge Amp Kit

800W RMS Status Series Class-D Monoblock Car Amplifier

HDA-M80, XKIT42 big
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Alpine HDA-M80 with NVX 4 Gauge Amp Kit

800W RMS Status Series Class-D Monoblock Car Amplifier

• Peak RMS Power: Up to 800W
• Total RMS Power: 400 watts
• Quick-connect speaker and power connectors
• Class D 2 ohm Stable Monoblock Amplifier
• Includes Amplifier Wiring Kit

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• Peak RMS Power: Up to 800W
• Total RMS Power: 400 watts
• Quick-connect speaker and power connectors
• Class D 2 ohm Stable Monoblock Amplifier
• Includes Amplifier Wiring Kit

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Soundstream DPA1.2000D with Amplifier Wiring Kit

400W RMS Reserve Series Class D Monoblock Car Amplifier with Bass Remote

DPA1.2000D, BAK82 big
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Soundstream DPA1.2000D with Amplifier Wiring Kit

400W RMS Reserve Series Class D Monoblock Car Amplifier with Bass Remote

• 250 watts x 1 channel @ 4 ohm
• 400 watts x 1 channel @ 2 ohm
• Total RMS Power: 400 watts
• Class D 2 ohm Stable Monoblock Amplifier
• Top-Mounted LCD Panel for Tuning
• Includes Amplifier Wiring Kit

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• 250 watts x 1 channel @ 4 ohm
• 400 watts x 1 channel @ 2 ohm
• Total RMS Power: 400 watts
• Class D 2 ohm Stable Monoblock Amplifier
• Top-Mounted LCD Panel for Tuning
• Includes Amplifier Wiring Kit

Cerwin Vega SRPM750.1D with Belva 8 Gauge Amp Kit

750W RMS Class-D Monoblock 2-Ohm Stable Marine Amplifier w/ Bass Knob Included

SRPM750.1D, XKIT82 big
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Cerwin Vega SRPM750.1D with Belva 8 Gauge Amp Kit

750W RMS Class-D Monoblock 2-Ohm Stable Marine Amplifier w/ Bass Knob Included

• 300 Watts RMS x 1 @ 4 ohm
• 500 Watts RMS x 1 @ 2 ohm
• 750W x 1 @ 1 Ohm
• Conformal Coating Protects Against Moisture
• Aluminum Heatsink

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• 300 Watts RMS x 1 @ 4 ohm
• 500 Watts RMS x 1 @ 2 ohm
• 750W x 1 @ 1 Ohm
• Conformal Coating Protects Against Moisture
• Aluminum Heatsink

Pioneer GM-DX971 with Amplifier Wiring Kit

1200W RMS GM Series Class-D Monoblock Car Amplifier with Bass Remote

GM-DX971, BAK42 big
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Pioneer GM-DX971 with Amplifier Wiring Kit

1200W RMS GM Series Class-D Monoblock Car Amplifier with Bass Remote

• 500 watts x 1 channel @ 4 ohm
• 800 watts x 1 channel @ 2 ohm
• 1200 watts x 1 channel @ 1 ohm
• Total RMS Power: 1200 watts
• CEA-2006 Compliant
• Includes Amplifier Wiring Kit
• Class D 1 ohm Stable Monoblock Amplifier

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• 500 watts x 1 channel @ 4 ohm
• 800 watts x 1 channel @ 2 ohm
• 1200 watts x 1 channel @ 1 ohm
• Total RMS Power: 1200 watts
• CEA-2006 Compliant
• Includes Amplifier Wiring Kit
• Class D 1 ohm Stable Monoblock Amplifier

Diamond Audio MICRO1V2 with NVX 8 Gauge Amp Kit

500W RMS Micro Series Class-D Monoblock Amplifier

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Diamond Audio MICRO1V2 with NVX 8 Gauge Amp Kit

500W RMS Micro Series Class-D Monoblock Amplifier

• 175 watts x 1 channel @ 4 ohm
• 300 watts x 1 channel @ 2 ohm
• Total RMS Power: 500 watts
• Class D 2 ohm Stable Monoblock Amplifier
• Includes Amplifier Wiring Kit

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• 175 watts x 1 channel @ 4 ohm
• 300 watts x 1 channel @ 2 ohm
• Total RMS Power: 500 watts
• Class D 2 ohm Stable Monoblock Amplifier
• Includes Amplifier Wiring Kit

Diamond Audio HXM800.1D with NVX 4 Gauge Amp Kit

800W RMS HXM Series Class-D Monoblock Full-Range Marine Amplifier

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Diamond Audio HXM800.1D with NVX 4 Gauge Amp Kit

800W RMS HXM Series Class-D Monoblock Full-Range Marine Amplifier

• 350 watts x 1 channel @ 4 ohm
• 550 watts x 1 channel @ 2 ohm
• 800 watts x 1 channel @ 1 ohm
• Total RMS Power: 800 watts
• Ultra-compact, high density aluminum alloy chassis provides superior thermal stability
• Class D 1 ohm Stable Monoblock Amplifier
• Includes Amplifier Wiring Kit

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• 350 watts x 1 channel @ 4 ohm
• 550 watts x 1 channel @ 2 ohm
• 800 watts x 1 channel @ 1 ohm
• Total RMS Power: 800 watts
• Ultra-compact, high density aluminum alloy chassis provides superior thermal stability
• Class D 1 ohm Stable Monoblock Amplifier
• Includes Amplifier Wiring Kit

Hertz HCP 1MDK with NVX 4 Gauge Amp Kit

2480 Peak Monoblock Class-D Marine Car Audio Amplifier

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Hertz HCP 1MDK with NVX 4 Gauge Amp Kit

2480 Peak Monoblock Class-D Marine Car Audio Amplifier

• 600 watts x 1 channel @ 4 ohm
• 1100 watts x 1 channel @ 2 ohm
• Total RMS Power: 1240 watts
• Corrosion Protection
• Class D 2 ohm Stable Monoblock Amplifier
• Includes Amplifier Wiring Kit

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• 600 watts x 1 channel @ 4 ohm
• 1100 watts x 1 channel @ 2 ohm
• Total RMS Power: 1240 watts
• Corrosion Protection
• Class D 2 ohm Stable Monoblock Amplifier
• Includes Amplifier Wiring Kit

JBL Club A600 with NVX 8 Gauge Amp Kit

600W RMS Club Series Class-D Compact Monoblock Amplifier with Bass Remote

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JBL Club A600 with NVX 8 Gauge Amp Kit

600W RMS Club Series Class-D Compact Monoblock Amplifier with Bass Remote

• 350 watts x 1 channel @ 4 ohm
• 600 watts x 1 channel @ 2 ohm
• Total RMS Power: 600 watts
• Class D 2 ohm Stable Monoblock Amplifier
• Includes Amplifier Wiring Kit

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• 350 watts x 1 channel @ 4 ohm
• 600 watts x 1 channel @ 2 ohm
• Total RMS Power: 600 watts
• Class D 2 ohm Stable Monoblock Amplifier
• Includes Amplifier Wiring Kit

Sound Extreme by ECOXGEAR SEI-AMPEV30011 with NVX 8 Gauge Amp Kit

300W RMS EV Series Class-D Monoblock High Definition Marine Amplifier

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Sound Extreme by ECOXGEAR SEI-AMPEV30011 with NVX 8 Gauge Amp Kit

300W RMS EV Series Class-D Monoblock High Definition Marine Amplifier

• 300 watts x 1 channel @ 4 ohm
• Total RMS Power: 300 watts
• Class D 4 ohm Stable Monoblock Amplifier
• Operating Voltage: 43V to 82V
• Marine-grade sealed die-cast aluminum chassis
• Includes Amplifier Wiring Kit

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• 300 watts x 1 channel @ 4 ohm
• Total RMS Power: 300 watts
• Class D 4 ohm Stable Monoblock Amplifier
• Operating Voltage: 43V to 82V
• Marine-grade sealed die-cast aluminum chassis
• Includes Amplifier Wiring Kit

Cerwin Vega CVP1600.1D with Belva 8 Gauge Amp Kit

CVP Series Monoblock Class-D Amplifier

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Cerwin Vega CVP1600.1D with Belva 8 Gauge Amp Kit

CVP Series Monoblock Class-D Amplifier

• CVP Series Monoblock Amplifier
• 200W RMS X 1 @ 2Ω / 120W RMS X 1 @ 4Ω
• 1-Ohm Stable Class D Monoblock Operation
• Direct Short, Thermal, & Overload Circuits Protect Amplifier
• 200mV-6V High Level or Low Level RCA Input
• Includes Amplifier Wiring Kit

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• CVP Series Monoblock Amplifier
• 200W RMS X 1 @ 2Ω / 120W RMS X 1 @ 4Ω
• 1-Ohm Stable Class D Monoblock Operation
• Direct Short, Thermal, & Overload Circuits Protect Amplifier
• 200mV-6V High Level or Low Level RCA Input
• Includes Amplifier Wiring Kit

Cerwin Vega CVP2000.1D with Belva 4 Gauge Amp Kit

2000W Peak (400W RMS) CVP Series Class-AB Monoblock Amplifier with Bass Remote

CVP20001D_BAK42 big
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Cerwin Vega CVP2000.1D with Belva 4 Gauge Amp Kit

2000W Peak (400W RMS) CVP Series Class-AB Monoblock Amplifier with Bass Remote

• 250 watts x 1 channel @ 4 ohm
• 400 watts x 1 channel @ 2 ohm
• Total RMS Power: 400 watts
• Class A/B 2 ohm Stable Monoblock Amplifier
• Includes Amplifier Wiring Kit

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• 250 watts x 1 channel @ 4 ohm
• 400 watts x 1 channel @ 2 ohm
• Total RMS Power: 400 watts
• Class A/B 2 ohm Stable Monoblock Amplifier
• Includes Amplifier Wiring Kit

Crunch DR-2725.1D with Belva 4 Gauge Amp Kit

2725W Peak Class D V-Drive Series Monoblock Car Subwoofer Amplifier with Bass Remote

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Crunch DR-2725.1D with Belva 4 Gauge Amp Kit

2725W Peak Class D V-Drive Series Monoblock Car Subwoofer Amplifier with Bass Remote

• 1360 watts x 1 channel @ 4 ohm
2725 watts x 1 channel @ 2 ohm
• Total peak power output: 2725 watts
• Class D 2 ohm Stable Monoblock Amplifier
• Includes Amplifier Wiring Kit

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• 1360 watts x 1 channel @ 4 ohm
2725 watts x 1 channel @ 2 ohm
• Total peak power output: 2725 watts
• Class D 2 ohm Stable Monoblock Amplifier
• Includes Amplifier Wiring Kit

Crunch DR-3725.1D with Belva 4 Gauge Amp Kit

3725W Peak Class D V-Drive Series Monoblock Car Subwoofer Amplifier with Bass Remote

DR37251D_BAK42 big
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Crunch DR-3725.1D with Belva 4 Gauge Amp Kit

3725W Peak Class D V-Drive Series Monoblock Car Subwoofer Amplifier with Bass Remote

• 930 watts x 1 channel @ 4 ohm
• 1860 watts x 1 channel @ 2 ohm
• 3725 watts x 1 channel @ 1 ohm
• Total peak power output: 3725 watts
• Class D 1 ohm Stable Monoblock Amplifier
• Includes Amplifier Wiring Kit

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• 930 watts x 1 channel @ 4 ohm
• 1860 watts x 1 channel @ 2 ohm
• 3725 watts x 1 channel @ 1 ohm
• Total peak power output: 3725 watts
• Class D 1 ohm Stable Monoblock Amplifier
• Includes Amplifier Wiring Kit

Deaf Bonce MFA 1.1000 with Belva 4 Gauge Amp Kit

1000W RMS Class D Machete Series Monoblock Subwoofer Amplifier with Bass Remote

MFA11000_BAK42 big
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Deaf Bonce MFA 1.1000 with Belva 4 Gauge Amp Kit

1000W RMS Class D Machete Series Monoblock Subwoofer Amplifier with Bass Remote

• 430 watts x 1 channel @ 4 ohm
• 710 watts x 1 channel @ 2 ohm
• 1000 watts x 1 channel @ 1 ohm
• Total RMS Power: 1000 watts
• Class D 1 ohm Stable Monoblock Amplifier

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• 430 watts x 1 channel @ 4 ohm
• 710 watts x 1 channel @ 2 ohm
• 1000 watts x 1 channel @ 1 ohm
• Total RMS Power: 1000 watts
• Class D 1 ohm Stable Monoblock Amplifier

Sound Extreme by ECOXGEAR SEI-AMP30011 with NVX 8 Gauge Amp Kit

300W RMS Class-D Monoblock High Definition Marine Amplifier

A30011_XKIT82 big
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Sound Extreme by ECOXGEAR SEI-AMP30011 with NVX 8 Gauge Amp Kit

300W RMS Class-D Monoblock High Definition Marine Amplifier

• 300 watts x 1 channel @ 4 ohm
• Total RMS Power: 300 watts
• Class D 4 ohm Stable Monoblock Amplifier
• Marine-grade sealed die-cast aluminum chassis
• Includes Amplifier Wiring Kit

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• 300 watts x 1 channel @ 4 ohm
• Total RMS Power: 300 watts
• Class D 4 ohm Stable Monoblock Amplifier
• Marine-grade sealed die-cast aluminum chassis
• Includes Amplifier Wiring Kit

Cerwin-Vega SPRO2100.1D with Belva 1/0 Gauge Amp Kit

2100W Peak (2100W RMS) Class-D Monoblock 1-Ohm Stable Amplifier with Bass Knob

SPRO2100.1D, BAK02 big
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Cerwin-Vega SPRO2100.1D with Belva 1/0 Gauge Amp Kit

2100W Peak (2100W RMS) Class-D Monoblock 1-Ohm Stable Amplifier with Bass Knob

• 900 Watts RMS x 1 @ 4 ohm
• 1400 Watts RMS x 1 @ 2 ohm
• 2100 Watts RMS x 1 @ 1 ohm, bridged
• Total Peak Power: 2100 Watts
• Built-in Low-Pass and Subsonic Filteres
• 0-12 dB Bass Boost
• Aluminum Heatsink
• Dimensions: 10.23" W x 18.03" L x 2.81" H

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• 900 Watts RMS x 1 @ 4 ohm
• 1400 Watts RMS x 1 @ 2 ohm
• 2100 Watts RMS x 1 @ 1 ohm, bridged
• Total Peak Power: 2100 Watts
• Built-in Low-Pass and Subsonic Filteres
• 0-12 dB Bass Boost
• Aluminum Heatsink
• Dimensions: 10.23" W x 18.03" L x 2.81" H

Kenwood eXcelon XR601-1 + NVX Premium XKIT42

600W RMS XR Series 2-ohm Stable Class-D Monoblock Amplifier w/ Bass Knob Included + NVX 4 Gauge Amp Wiring Kit

XR601-1, XKIT42 big
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Kenwood eXcelon XR601-1 + NVX Premium XKIT42

600W RMS XR Series 2-ohm Stable Class-D Monoblock Amplifier w/ Bass Knob Included + NVX 4 Gauge Amp Wiring Kit

• 400 Watts RMS x 1 @ 4 ohm
• 600 Watts RMS x 1 @ 2 ohm
• Total Peak Power: 1200 Watts
• CEA-2006 Compliant
• Bass Knob Included
• Aluminum Heatsink
• Dimensions: 8-11/16" W x 6-5/8" L x 1-3/8" H

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• 400 Watts RMS x 1 @ 4 ohm
• 600 Watts RMS x 1 @ 2 ohm
• Total Peak Power: 1200 Watts
• CEA-2006 Compliant
• Bass Knob Included
• Aluminum Heatsink
• Dimensions: 8-11/16" W x 6-5/8" L x 1-3/8" H

Earthquake Sound Mini D2000 with NVX 8 Gauge Amp Kit

2000W Max Monoblock MINI D Mono Compact Car Amplifier

MINID2000_XKIT82 big
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Earthquake Sound Mini D2000 with NVX 8 Gauge Amp Kit

2000W Max Monoblock MINI D Mono Compact Car Amplifier

• RMS: 650W x 1 @ 4 ohm, 1000W x 1 @ 2 ohm, 1200W x 1 @ 1 ohm
• Total Peak Power: 2000W
• Mini Class D Design
• Bass Boost: 0-12 dB at 50 Hz
• Wired Bass Remote Control Included
• Dimensions: 6-5/16"W x 12-5/16"L x 1-7/8"H
• Includes Amplifier Wiring Kit

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• RMS: 650W x 1 @ 4 ohm, 1000W x 1 @ 2 ohm, 1200W x 1 @ 1 ohm
• Total Peak Power: 2000W
• Mini Class D Design
• Bass Boost: 0-12 dB at 50 Hz
• Wired Bass Remote Control Included
• Dimensions: 6-5/16"W x 12-5/16"L x 1-7/8"H
• Includes Amplifier Wiring Kit

MB Quart FA2-2000.1 with Amplifier Wiring Kit

2000W RMS Formula Series Class-D Monoblock Car Amplifier

FA2-2000.1, BAK42 big
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MB Quart FA2-2000.1 with Amplifier Wiring Kit

2000W RMS Formula Series Class-D Monoblock Car Amplifier

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

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

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    FAQ for Monoblock Sub Amplifiers in 1987 325e

    Q: Can I upgrade or change the Monoblock Sub Amplifiers in 1987 BMW 325e?

    A: Yes this page includes all the best Monoblock Sub Amplifiers that work in your 325e.

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