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1983 BMW 320i

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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 1983 BMW 320i

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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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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-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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• 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

Diamond Audio DES400.2D with NVX 8 Gauge Amp Kit

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

DES4002D_XKIT82 big
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Diamond Audio DES400.2D with NVX 8 Gauge Amp Kit

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

• 200 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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• 200 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

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

Wet Sounds SDX4 with NVX 4 Gauge Amp Kit

1370 Watt Sinister Series Full Range 4-Channel Class D Amplifier (WetSounds)

SDX4_XKIT44 big
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Wet Sounds SDX4 with NVX 4 Gauge Amp Kit

1370 Watt Sinister Series Full Range 4-Channel Class D Amplifier (WetSounds)

• RMS: 185W x 4 @ 4 ohm, 340W x 4 @ 2 ohm, Bridged: 685W x 2 @ 4 ohm
• Total RMS Power: 1370 watts
• Wet Sounds unique transformer
• Advanced Intelligent Microprocessor Control
• Top mounted crossover controls
• Dimensions: 9.82" W x 13.50" L x 2.70" H
• Includes Amplifier Wiring Kit

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• RMS: 185W x 4 @ 4 ohm, 340W x 4 @ 2 ohm, Bridged: 685W x 2 @ 4 ohm
• Total RMS Power: 1370 watts
• Wet Sounds unique transformer
• Advanced Intelligent Microprocessor Control
• Top mounted crossover controls
• Dimensions: 9.82" W x 13.50" L x 2.70" H
• Includes Amplifier Wiring Kit

Rockford Fosgate Punch PM500X2 + NVX XKIT42 4 Gauge Amp Wiring Kit

500W Punch Series Class A/B 2-Channel Marine Amplifier

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Rockford Fosgate Punch PM500X2 + NVX XKIT42 4 Gauge Amp Wiring Kit

500W Punch Series Class A/B 2-Channel Marine Amplifier

• 150 watts RMS x 2 chan. @ 4 ohm
• 250 watts RMS x 2 chan. @ 2 ohm
• 500 watts RMS 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
• Includes NVX XKIT42 4 Gauge Amp Wiring Kit

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• 150 watts RMS x 2 chan. @ 4 ohm
• 250 watts RMS x 2 chan. @ 2 ohm
• 500 watts RMS 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
• Includes NVX XKIT42 4 Gauge Amp 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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• 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

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

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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

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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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• 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

DS18 ION1600.4D with NVX 4 Gauge Amp Kit

4800W Peak (1600W RMS) Class D ION Series 4 Channel Car Amplifier

ION16004D_XKIT44 big
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DS18 ION1600.4D with NVX 4 Gauge Amp Kit

4800W Peak (1600W RMS) Class D ION Series 4 Channel Car Amplifier

• 240 watts x 4 channel @ 4 ohm
• 400 watts x 4 channel @ 2 ohm
• Bridged: 800 watts x 2 channel @ 4 ohm
• Total RMS Power: 1600 watts
• Class D 2 ohm Stable 4-Channel-Channel Amplifier
• Includes Amplifier Wiring Kit

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• 240 watts x 4 channel @ 4 ohm
• 400 watts x 4 channel @ 2 ohm
• Bridged: 800 watts x 2 channel @ 4 ohm
• Total RMS Power: 1600 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

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

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

R2-200X2, BAK42 big
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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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• 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

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

Cerwin Vega B52 with Belva 4 Gauge Amp Kit

1000W Peak Bomber Series 2-Channel Class D Amplifier

B52, BAK42 big
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Cerwin Vega B52 with Belva 4 Gauge Amp Kit

1000W Peak Bomber Series 2-Channel Class D Amplifier

• RMS: 200 Watts x 2 @ 4 ohm, 250 Watts x 2 @ 2 ohm, Bridged: 500 Watts x 1 @ 4 ohm
• Total Peak Power: 1000 Watts
• Class D IR Chipset with DirectFET Power Mosfet Output
• Wired remote bass level control included
• Ultra Compact High-Density Aluminum Alloy Chassis
• Dimensions: 4.02" W x 6.61" L x 1.40" H

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• RMS: 200 Watts x 2 @ 4 ohm, 250 Watts x 2 @ 2 ohm, Bridged: 500 Watts x 1 @ 4 ohm
• Total Peak Power: 1000 Watts
• Class D IR Chipset with DirectFET Power Mosfet Output
• Wired remote bass level control included
• Ultra Compact High-Density Aluminum Alloy Chassis
• Dimensions: 4.02" W x 6.61" L x 1.40" H

Deaf Bonce MFA 4.220 with Belva 4 Gauge Amp Kit

1320W RMS Machete Series Class D 4-Channel Car Amplifier

MFA4220_BAK44 big
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Deaf Bonce MFA 4.220 with Belva 4 Gauge Amp Kit

1320W RMS Machete Series Class D 4-Channel Car Amplifier

• 220 watts x 4 channel @ 4 ohm
• 330 watts x 4 channel @ 2 ohm
• Bridged: 660 watts x 2 channel @ 4 ohm
• Total RMS Power: 1320 watts
• Class D 2 ohm Stable 4-Channel Amplifier
• Includes Amplifier Wiring Kit

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• 220 watts x 4 channel @ 4 ohm
• 330 watts x 4 channel @ 2 ohm
• Bridged: 660 watts x 2 channel @ 4 ohm
• Total RMS Power: 1320 watts
• Class D 2 ohm Stable 4-Channel Amplifier
• Includes Amplifier Wiring Kit

Deaf Bonce MFA 2.520 with Belva 4 Gauge Amp Kit

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

MFA2520_BAK42 big
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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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• 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

DS18 SXE-2000.4D/BK (Black) with Belva 4 Gauge Amp Kit

2000W Peak (640W RMS) Class D SXE Series 4-Channel Car Amplifier

SXE20004DBK_BAK44 big
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DS18 SXE-2000.4D/BK (Black) with Belva 4 Gauge Amp Kit

2000W Peak (640W RMS) Class D SXE Series 4-Channel Car Amplifier

• 100 watts x 4 channel @ 4 ohm
• 160 watts x 4 channel @ 2 ohm
• Bridged: 320 watts x 3 channel @ 4 ohm
• Total RMS Power: 640 watts
• Class D 2 ohm Stable 4-Channel-Channel Amplifier (Black)
• Includes Amplifier Wiring Kit

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• 100 watts x 4 channel @ 4 ohm
• 160 watts x 4 channel @ 2 ohm
• Bridged: 320 watts x 3 channel @ 4 ohm
• Total RMS Power: 640 watts
• Class D 2 ohm Stable 4-Channel-Channel Amplifier (Black)
• Includes Amplifier Wiring Kit

Hifonics HCM-800.4D with Belva 4 Gauge Amp Kit

800W Peak Colossus Mini Series Class-D 4-Channel Amplifier with Bass Remote

HCM8004D_BAK44 big
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Hifonics HCM-800.4D with Belva 4 Gauge Amp Kit

800W Peak Colossus Mini Series Class-D 4-Channel Amplifier with Bass Remote

• 4 x 100 @ 4 ohm
• 4 x 200 @ 2 ohm
• Bridged: 2 x 400 @ 4 ohm
• Total Peak Power: 800W
• Class D 2 ohm Stable 4-Channel Amplifier
• Includes Amplifier Wiring Kit

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• 4 x 100 @ 4 ohm
• 4 x 200 @ 2 ohm
• Bridged: 2 x 400 @ 4 ohm
• Total Peak Power: 800W
• Class D 2 ohm Stable 4-Channel Amplifier
• Includes Amplifier Wiring Kit

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Rockford Fosgate Punch P300X2 with Belva 4 Gauge Amp Kit

300W RMS Punch Series 2-Channel Class AB Car Power Amplifier

P300X2_BAK42 big
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Rockford Fosgate Punch P300X2 with Belva 4 Gauge Amp Kit

300W RMS Punch Series 2-Channel Class AB Car Power Amplifier

• 100 watts x 2 channel @ 4 ohm
• 150 watts x 2 channel @ 2 ohm
• Bridged: 300 watts x 1 channel @ 4 ohm
• Total RMS Power: 300 watts
• Class A/B 2 ohm Stable 2-Channel-Channel Amplifier
• Includes Amplifier Wiring Kit

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• 100 watts x 2 channel @ 4 ohm
• 150 watts x 2 channel @ 2 ohm
• Bridged: 300 watts x 1 channel @ 4 ohm
• Total RMS Power: 300 watts
• Class A/B 2 ohm Stable 2-Channel-Channel Amplifier
• Includes Amplifier Wiring Kit

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    FAQ for Multi-channel Amplifiers for Adding Speakers in 1983 320i

    Q: Can I upgrade or change the Multi-channel Amplifiers for Adding Speakers in 1983 BMW 320i?

    A: Yes this page includes all the best Multi-channel Amplifiers for Adding Speakers that work in your 320i.

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