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  1. Home
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  3. Discontinued Alpine Car Audio & Electronics
  4. Discontinued Alpine Car Amplifiers
  5. Discontinued Alpine 4-Channel Amplifiers

Discontinued Alpine 4-Channel Amplifiers

Drive multiple speakers with Alpine's versatile 4-channel amplifiers for rich sound.

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Product Type
Price Range
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.
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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You are currently viewing discontinued products.

Alpine PDX-4.100 Open Box

4-Channel Power Density Digital Amplifier (PDX4.100)

PDX-4.100 big DISCONTINUED
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Alpine PDX-4.100 Open Box

4-Channel Power Density Digital Amplifier (PDX4.100)

4-Channel Power Density Digital Amplifier • 100W x 4 chan. @ 4 Ohm • class D amp design • stackable installation design • MOSFET power supply • quick connect power connectors

4-Channel Power Density Digital Amplifier • 100W x 4 chan. @ 4 Ohm • class D amp design • stackable installation design • MOSFET power supply • quick connect power connectors

Alpine PDX-4.100 R/B

4-Channel Power Density Digital Amplifier (PDX4.100)

PDX-4.100 big DISCONTINUED
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Alpine PDX-4.100 R/B

4-Channel Power Density Digital Amplifier (PDX4.100)

4-Channel Power Density Digital Amplifier • 100W x 4 chan. @ 4 Ohm • class D amp design • stackable installation design • MOSFET power supply • quick connect power connectors

4-Channel Power Density Digital Amplifier • 100W x 4 chan. @ 4 Ohm • class D amp design • stackable installation design • MOSFET power supply • quick connect power connectors

Alpine MRV-F300 Open Box

300W 4-Channel Class D V-Power Series Compact Car Amplifier

MRV-F300 big DISCONTINUED
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Alpine MRV-F300 Open Box

300W 4-Channel Class D V-Power Series Compact Car Amplifier

• RMS Power: 50W x 4-Chan. @ 4 ohm, 75W x 4-Chan. @ 2 ohm
• 3-Way System Protection
• 4/3/2/1 Channel Operation
• 8 Gauge Power and Ground Inputs
• Same Power in a 40% Smaller Chassis

• RMS Power: 50W x 4-Chan. @ 4 ohm, 75W x 4-Chan. @ 2 ohm
• 3-Way System Protection
• 4/3/2/1 Channel Operation
• 8 Gauge Power and Ground Inputs
• Same Power in a 40% Smaller Chassis

Alpine KTP-445U-open box

Universal Head Unit Power Pack for Use with all Aftermarket & Factory Receivers

KTP-445U big DISCONTINUED
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Alpine KTP-445U-open box

Universal Head Unit Power Pack for Use with all Aftermarket & Factory Receivers

• RMS Power: 45W x 4-Chan. @ 4 Ohm
• Adjustable Gain Switch
• Plug-and-Play
• CEA-2006 Compliant

• RMS Power: 45W x 4-Chan. @ 4 Ohm
• Adjustable Gain Switch
• Plug-and-Play
• CEA-2006 Compliant

Alpine PDR-F50-open box

4-Channel 85W PDR Series Class D Car Amplifier

PDR-F50 big DISCONTINUED
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Alpine PDR-F50-open box

4-Channel 85W PDR Series Class D Car Amplifier

• RMS Power: 85W x 4 @ 4 ohm, 125W x 2 @ 2 ohm, 250W x 2 @ 4 ohm, Bridged
• Preamp Outputs
• Dimensions: 9"W x 7.12"L x 2.8"H

• RMS Power: 85W x 4 @ 4 ohm, 125W x 2 @ 2 ohm, 250W x 2 @ 4 ohm, Bridged
• Preamp Outputs
• Dimensions: 9"W x 7.12"L x 2.8"H

Alpine MRV-F545 R/B

4-Channel High Power Amplifier

MRV-F545 big DISCONTINUED
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Alpine MRV-F545 R/B

4-Channel High Power Amplifier

V12 4-Channel High Power Amplifier • 125W RMS x 4 @ 4 • 500W RMS x 1 Bridged (Chan 3/4) • Blue LCD Display • Amplifier Link • 1 Preamp Outputs • Bass Engine • Adjustable Crossover and Input Sensitivity

V12 4-Channel High Power Amplifier • 125W RMS x 4 @ 4 • 500W RMS x 1 Bridged (Chan 3/4) • Blue LCD Display • Amplifier Link • 1 Preamp Outputs • Bass Engine • Adjustable Crossover and Input Sensitivity

Alpine KTP-445U Power Pack

180W RMS Power Pack Series Compact Class D 4-Channel Car Amplifier

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Alpine KTP-445U Power Pack

180W RMS Power Pack Series Compact Class D 4-Channel Car Amplifier

• RMS Power: 45W x 4-Chan. @ 4 Ohm
• Adjustable Gain Switch
• Plug-and-Play
• CEA-2006 Compliant

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VIP Product Get $35.00 in rewards to spend later

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• RMS Power: 45W x 4-Chan. @ 4 Ohm
• Adjustable Gain Switch
• Plug-and-Play
• CEA-2006 Compliant

(2) FREE Pairs Alpine SPS-610 (6.5") + Alpine XA70F Amplified Speaker Package

(2) Pairs 6.5" Alpine SPS-610 + Alpine XA70F 1400 Watt Amplified Pro Speaker Package

SPS-610_XA70F big DISCONTINUED
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(2) FREE Pairs Alpine SPS-610 (6.5") + Alpine XA70F Amplified Speaker Package

(2) Pairs 6.5" Alpine SPS-610 + Alpine XA70F 1400 Watt Amplified Pro Speaker Package

• FEATURE 1
• FEATURE 2
• FEATURE 3
• FEATURE 4
• FEATURE 5
• FEATURE 6
• FEATURE 7

64

• FEATURE 1
• FEATURE 2
• FEATURE 3
• FEATURE 4
• FEATURE 5
• FEATURE 6
• FEATURE 7

Alpine MRV-F300

300W 4-Channel Class D V-Power Series Compact Car Amplifier

MRV-F300 big DISCONTINUED
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Alpine MRV-F300

300W 4-Channel Class D V-Power Series Compact Car Amplifier

• RMS Power: 50W x 4-Chan. @ 4 ohm, 75W x 4-Chan. @ 2 ohm
• 3-Way System Protection
• 4/3/2/1 Channel Operation
• 8 Gauge Power and Ground Inputs
• Same Power in a 40% Smaller Chassis

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VIP Product Get $19.00 in rewards to spend later

17

• RMS Power: 50W x 4-Chan. @ 4 ohm, 75W x 4-Chan. @ 2 ohm
• 3-Way System Protection
• 4/3/2/1 Channel Operation
• 8 Gauge Power and Ground Inputs
• Same Power in a 40% Smaller Chassis

Alpine PDX-F6

600W RMS, PDX Series 4-Channel Power Density Digital Amplifier

PDX-F6 big DISCONTINUED
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Alpine PDX-F6

600W RMS, PDX Series 4-Channel Power Density Digital Amplifier

PDX Series 4-Channel Car Amplifier • Class D • 600 Watts RMS • 150 Watts x 4 Chan. RMS • Variable High-Pass and Low-Pass Filter • Blue LED Power/Status Indicator • Compact Size

PDX Series 4-Channel Car Amplifier • Class D • 600 Watts RMS • 150 Watts x 4 Chan. RMS • Variable High-Pass and Low-Pass Filter • Blue LED Power/Status Indicator • Compact Size

EXCLUSIVE

Alpine Speakers + Kicker Amplifier Bundle

5-1/4" Alpine SPS-510 Type S Series Speakers + Kicker 11DX400.4 4 Chan. Amp + Kit + Sound Dampening

11DX400.4_SPS-510 big DISCONTINUED
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Alpine Speakers + Kicker Amplifier Bundle

5-1/4" Alpine SPS-510 Type S Series Speakers + Kicker 11DX400.4 4 Chan. Amp + Kit + Sound Dampening

5-1/4" Type S Series Car Speakers • 340W Max • 110W RMS • DX Series 4-Channel Class AB Car Amplifier • MOSFET Power Supply • Fail-Safe Integration Technology • Amplifier Kit • Sound Dampening Material

5-1/4" Type S Series Car Speakers • 340W Max • 110W RMS • DX Series 4-Channel Class AB Car Amplifier • MOSFET Power Supply • Fail-Safe Integration Technology • Amplifier Kit • Sound Dampening Material

Alpine PDX-F4 Open Box, Accepatble Condition (Used)

400W PDX Series 4-Channel Power Density Digital Class D Car Amplifier

PDX-F4 big DISCONTINUED
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Alpine PDX-F4 Open Box, Accepatble Condition (Used)

400W PDX Series 4-Channel Power Density Digital Class D Car Amplifier

• Item Condition: Open Box
• RMS Power: 100W x 4-Chan. @ 4 ohm
• 400 Watts RMS
• Class D
• Variable High-Pass and Low-Pass Filter
• Blue LED Power/Status Indicator
• Compact Size

• Item Condition: Open Box
• RMS Power: 100W x 4-Chan. @ 4 ohm
• 400 Watts RMS
• Class D
• Variable High-Pass and Low-Pass Filter
• Blue LED Power/Status Indicator
• Compact Size

Alpine PDX-4.150 Defective #2

(Defective) 4-Channel Power Density Digital Amplifier (PDX4.150)

No picture DISCONTINUED
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Alpine PDX-4.150 Defective #2

(Defective) 4-Channel Power Density Digital Amplifier (PDX4.150)

Defective• 4-Channel Power Density Digital Amplifier • 150W x 4 chan. @ 4 Ohm • class D amp design • stackable installation design • MOSFET power supply • quick connect power connectors

Defective• 4-Channel Power Density Digital Amplifier • 150W x 4 chan. @ 4 Ohm • class D amp design • stackable installation design • MOSFET power supply • quick connect power connectors

Alpine PSS-21WRA Open Box (Complete)

2015-2017 Jeep Wrangler Unlimited Complete Sound Solution

PSS-21WRA big DISCONTINUED
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Alpine PSS-21WRA Open Box (Complete)

2015-2017 Jeep Wrangler Unlimited Complete Sound Solution

• Complete audio upgrade for 2015-2017 Jeep Wrangler Unlimited vehicles
•Includes midwoofers, tweeters, a powered subwoofer and a 4-channel amplifier

• Complete audio upgrade for 2015-2017 Jeep Wrangler Unlimited vehicles
•Includes midwoofers, tweeters, a powered subwoofer and a 4-channel amplifier

Alpine PDX-4.150 Defective

(Defective) 4-Channel Power Density Digital Amplifier (PDX4.150)

PDX-4.150-DF-2 big DISCONTINUED
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Alpine PDX-4.150 Defective

(Defective) 4-Channel Power Density Digital Amplifier (PDX4.150)

Defective• 4-Channel Power Density Digital Amplifier • 150W x 4 chan. @ 4 Ohm • class D amp design • stackable installation design • MOSFET power supply • quick connect power connectors

Defective• 4-Channel Power Density Digital Amplifier • 150W x 4 chan. @ 4 Ohm • class D amp design • stackable installation design • MOSFET power supply • quick connect power connectors

Alpine MRV-F300_XKIT82

300W 4-Channel Class D V-Power Series Compact Car Amplifier + FREE 100% Copper 2-Channel True Spec 8 Gauge Amplifier Installation Kit

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Alpine MRV-F300_XKIT82

300W 4-Channel Class D V-Power Series Compact Car Amplifier + FREE 100% Copper 2-Channel True Spec 8 Gauge Amplifier Installation Kit

• RMS Power: 50W x 4-Chan. @ 4 ohm, 75W x 4-Chan. @ 2 ohm
• 3-Way System Protection
• 4/3/2/1 Channel Operation
• 8 Gauge Power and Ground Inputs
• Same Power in a 40% Smaller Chassis
• 8 Gauge 2-Channel Complete Amplifier Installation Kit

• RMS Power: 50W x 4-Chan. @ 4 ohm, 75W x 4-Chan. @ 2 ohm
• 3-Way System Protection
• 4/3/2/1 Channel Operation
• 8 Gauge Power and Ground Inputs
• Same Power in a 40% Smaller Chassis
• 8 Gauge 2-Channel Complete Amplifier Installation Kit

Alpine R2-A60F (Like New (Open Box))

600W RMS Class D R-Series 4 Channel Car Amplifier

R2-A60F big DISCONTINUED
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Alpine R2-A60F (Like New (Open Box))

600W RMS Class D R-Series 4 Channel Car Amplifier

• 100 watts x 4 channel @ 4 ohm
• 150 watts x 4 channel @ 2 ohm
• Bridged: 300 watts x 2 channel @ 4 ohm
• Total RMS Power: 600 watts
• Class D 2 ohm Stable 4-Channel Amplifier

• 100 watts x 4 channel @ 4 ohm
• 150 watts x 4 channel @ 2 ohm
• Bridged: 300 watts x 2 channel @ 4 ohm
• Total RMS Power: 600 watts
• Class D 2 ohm Stable 4-Channel Amplifier

Alpine X Series 700W 4 Channel Class D Power Density Car Amplifier (2 Pack)

Alpine X Series 700W 4 Channel Class D Power Density Car Amplifier (2 Pack)

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Alpine X Series 700W 4 Channel Class D Power Density Car Amplifier (2 Pack)

Alpine X Series 700W 4 Channel Class D Power Density Car Amplifier (2 Pack)

• 120 Watts RMS x 4 @ 4 ohm
• 715 Watts RMS x 4 @ 2 ohm
• 350 Watts RMS x 2 @ 4 ohm, Bridged
• CEA-2006 Compliant
• Low Pass and High Pass Filters
• 0 - 12dB Bass Boost
• Aluminum Heatsink
• Dimensions: 11-3/4" W x 7-5/8" L x 2" H

2

• 120 Watts RMS x 4 @ 4 ohm
• 715 Watts RMS x 4 @ 2 ohm
• 350 Watts RMS x 2 @ 4 ohm, Bridged
• CEA-2006 Compliant
• Low Pass and High Pass Filters
• 0 - 12dB Bass Boost
• Aluminum Heatsink
• Dimensions: 11-3/4" W x 7-5/8" L x 2" H

Alpine S2-A36F (Open Box, Good)

360W RMS Class D S-Series 4 Channel Car Amplifier

S2-A36F big DISCONTINUED
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Alpine S2-A36F (Open Box, Good)

360W RMS Class D S-Series 4 Channel Car Amplifier

• 60 watts x 4 channel @ 4 ohm
• 90 watts x 4 channel @ 2 ohm
• Bridged: 180 watts x 2 channel @ 4 ohm
• Total RMS Power: 360 watts
• Class D 2 ohm Stable 4-Channel Amplifier

• 60 watts x 4 channel @ 4 ohm
• 90 watts x 4 channel @ 2 ohm
• Bridged: 180 watts x 2 channel @ 4 ohm
• Total RMS Power: 360 watts
• Class D 2 ohm Stable 4-Channel Amplifier

Alpine KTA-450 (Like New (Open Box))

400W Peak (200W RMS) Class D Power Pack Series 4 Channel Car Amplifier

KTA-450 big DISCONTINUED
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Alpine KTA-450 (Like New (Open Box))

400W Peak (200W RMS) Class D Power Pack Series 4 Channel Car Amplifier

• 50 watts x 4 channel @ 4 ohm
• 45 watts x 4 channel @ 2 ohm
• Total RMS Power: 200 watts
• Class D 2 ohm Stable 4-Channel Amplifier

• 50 watts x 4 channel @ 4 ohm
• 45 watts x 4 channel @ 2 ohm
• Total RMS Power: 200 watts
• Class D 2 ohm Stable 4-Channel Amplifier

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    Alpine 4-Channel Amplifiers Information

    A 4 channel car amplifier from Alpine will provide your vehicle with the power it requires. These amps can operate four channels and Alpine is a leader in amplification solutions. Power your speakers with a Alpine 4-channel amplifier for a great all around sound.
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