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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.
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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.
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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.
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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.
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The lowest impedance the amplifier will handle when it is not bridged.
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The lowest impedance the amplifier will handle when it is bridged.
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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.
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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.
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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.
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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.

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This feature will tell you if the amplifier has the capability to connect to a Bluetooth device.
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Metra MPS-RZHB2

Headlight Bracket Upgrade for 2008-2017 Polaris

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Headlight Bracket Upgrade for 2008-2017 Polaris

• Constructed with steel
• Uses OEM mounting and hardware
• Durable sand grit powder coating
• Sold in pairs

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• Constructed with steel
• Uses OEM mounting and hardware
• Durable sand grit powder coating
• Sold in pairs

Metra 70-5601

Wiring Harness for Aftermarket Head Unit to JBL System for select 1995-1997 vehicles from Lincoln, Ford

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Wiring Harness for Aftermarket Head Unit to JBL System for select 1995-1997 vehicles from Lincoln, Ford

• Wiring Harness For Aftermarket Head Unit To JBL System
• For Select 1994-1997 Ford/Lincoln/Mercury Vehicles
• Allows For Installation Of Aftermarket Head Unit

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• Wiring Harness For Aftermarket Head Unit To JBL System
• For Select 1994-1997 Ford/Lincoln/Mercury Vehicles
• Allows For Installation Of Aftermarket Head Unit

Install Bay 89-00-9031 by Metra

12"x12" ABS Plastic Sheet

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12"x12" ABS Plastic Sheet

• 12" x 12" ABS Blank Panel Trim
• Customize The Blank Panel By Shaping It Or Cutting It Out
• Use It To Fill In Spaces And Gaps Or To Mount Accessories

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• 12" x 12" ABS Blank Panel Trim
• Customize The Blank Panel By Shaping It Or Cutting It Out
• Use It To Fill In Spaces And Gaps Or To Mount Accessories

Metra 82-4301

Universal 1" Speaker Spacer Rings for 6" to 6-3/4"

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Universal 1" Speaker Spacer Rings for 6" to 6-3/4"

• Universal 1" Speaker Spacer Rings for 6" to 6.75" Aftermarket Car Speakers
• Color: Black
• High Grade ABS Plastic Construction
• Factory Matched Texture Style

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• Universal 1" Speaker Spacer Rings for 6" to 6.75" Aftermarket Car Speakers
• Color: Black
• High Grade ABS Plastic Construction
• Factory Matched Texture Style

Metra 72-4568

Speaker Wiring Harness for select 1984-2023 vehicles from GMC, Chevrolet, Pontiac

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Speaker Wiring Harness for select 1984-2023 vehicles from GMC, Chevrolet, Pontiac

• Compatible with select 1984-2023 vehicles from GMC, Chevrolet, Pontiac Vehicles
• Connects speakers to factory harness

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• Compatible with select 1984-2023 vehicles from GMC, Chevrolet, Pontiac Vehicles
• Connects speakers to factory harness

Metra Kit 86-5618

Radio Removal Tool for

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Radio Removal Tool for

• Radio Removal Tool
• Compatible with Vehicles
• Secure fit
• Removal Keys
• Ford Specific
• Quality assured

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• Radio Removal Tool
• Compatible with Vehicles
• Secure fit
• Removal Keys
• Ford Specific
• Quality assured

Metra 44-UA200 Antenna

Amplified AM/FM Antenna that will help you get better signal for clarity (Metra 44-UA200)

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Amplified AM/FM Antenna that will help you get better signal for clarity (Metra 44-UA200)

• High Performance Windshield or Glass Mount Amplified Antenna
• Separate AM/FM Amplifiers • Ground wire for noise-cancellation
• LED Indicator confirms amplifier operation

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• High Performance Windshield or Glass Mount Amplified Antenna
• Separate AM/FM Amplifiers • Ground wire for noise-cancellation
• LED Indicator confirms amplifier operation

Metra Kit 95-9999

Radio Kit Double DIN - Universal

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Radio Kit Double DIN - Universal

• Stereo Installation Dash Kit
• Universal Radio Kit Double DIN
• Accommodates ISO Double DIN Mount
• Painted to Match Factory Dash Color
• High-Grade ABS Plastic Construction
• Factory Style Texture

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• Stereo Installation Dash Kit
• Universal Radio Kit Double DIN
• Accommodates ISO Double DIN Mount
• Painted to Match Factory Dash Color
• High-Grade ABS Plastic Construction
• Factory Style Texture

Metra 44-FD80 Antenna

Replacement Antenna for Select Ford Vehicles

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Replacement Antenna for Select Ford Vehicles

• Replacement Antenna for Select Ford Vehicles
• 31" Removable Mast
• For Select Ford Vehicles

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$15.99

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• Replacement Antenna for Select Ford Vehicles
• 31" Removable Mast
• For Select Ford Vehicles

Metra 72-5600

Speaker Harness for select 1998-2024 vehicles from Ford, Lincoln, Mercury

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Speaker Harness for select 1998-2024 vehicles from Ford, Lincoln, Mercury

• Compatible with select 1998-2024 vehicles from Ford, Lincoln, Mercury Vehicles
• Connects aftermarket speakers to the factory speaker harness
• Quick and easy installation
• No cutting needed
• Plugs directly into the harness

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• Compatible with select 1998-2024 vehicles from Ford, Lincoln, Mercury Vehicles
• Connects aftermarket speakers to the factory speaker harness
• Quick and easy installation
• No cutting needed
• Plugs directly into the harness

Metra 44-US13 Antenna

Side/Top Mount Replacement Antenna for AM/FM Bands

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Side/Top Mount Replacement Antenna for AM/FM Bands

• Side/Top Mount Antenna for 1" Hole Split Ball Applications
• 53" 3-Section Mast with Spring
• Color: Chrome

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• Side/Top Mount Antenna for 1" Hole Split Ball Applications
• 53" 3-Section Mast with Spring
• Color: Chrome

Metra 82-6900

Adds 1.5-inch Depth to 6x9-inch Car Speakers - Universal Speaker Spacers/Depth Extenders

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Adds 1.5-inch Depth to 6x9-inch Car Speakers - Universal Speaker Spacers/Depth Extenders

• 6" x 9" Universal Speaker Spacers / Depth Extenders
• Adds 1-1/2" depth to speakers
• Items that make the installer's Life easier
• Trimrings and Trimplates
• Speaker Grills
• Speaker Adapter plates

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• 6" x 9" Universal Speaker Spacers / Depth Extenders
• Adds 1-1/2" depth to speakers
• Items that make the installer's Life easier
• Trimrings and Trimplates
• Speaker Grills
• Speaker Adapter plates

Metra 44-EC12 Antenna Extension

12" Universal Antenna Extension Cable

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12" Universal Antenna Extension Cable

• Universal Antenna Extender
• Extends Antenna 12" (1 ft.)

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• Universal Antenna Extender
• Extends Antenna 12" (1 ft.)

Metra 70-1727

Factory Amplifier Bypass Harness for 2006-2011 Honda Civic, Civic Hybrid

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Factory Amplifier Bypass Harness for 2006-2011 Honda Civic, Civic Hybrid

• Factory Amplifier Bypass Harness for 2006-2009 Honda Civic Vehicles
• Bypass Factory Amplifier
• Premium Sound System
• Allows For Installation Of Aftermarket Radio Using Existing Factory Wiring

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• Factory Amplifier Bypass Harness for 2006-2009 Honda Civic Vehicles
• Bypass Factory Amplifier
• Premium Sound System
• Allows For Installation Of Aftermarket Radio Using Existing Factory Wiring

Metra 82-3002 - GM Speaker Mounting Brackets

5-1/4" - 6-1/2" Speaker Adapter Bracket for select 1995-2023 vehicles from GMC, Chevrolet, Pontiac

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5-1/4" - 6-1/2" Speaker Adapter Bracket for select 1995-2023 vehicles from GMC, Chevrolet, Pontiac

• 5-1/4" - 6-1/2" Speaker Adapter Bracket
• Compatible with select 1995-2023 vehicles from GMC, Chevrolet, Pontiac Vehicles
• Sold in pairs

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• 5-1/4" - 6-1/2" Speaker Adapter Bracket
• Compatible with select 1995-2023 vehicles from GMC, Chevrolet, Pontiac Vehicles
• Sold in pairs

Metra BC-AMP04

Amplifier Mounting Bracket for Harley Davidson Road Glide 2015-Up

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Amplifier Mounting Bracket for Harley Davidson Road Glide 2015-Up

• Fits all Harley Davidson Road Glide® 2015 – Up
• No drilling required
• Steel construction with UV powder coating
• Pre-drilled for Metra PowerSports Amps (MPS-AMP60x4, MPS-AMP100x2 or MPS-AMP200-2D)
• Works with most other micro amps

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• Fits all Harley Davidson Road Glide® 2015 – Up
• No drilling required
• Steel construction with UV powder coating
• Pre-drilled for Metra PowerSports Amps (MPS-AMP60x4, MPS-AMP100x2 or MPS-AMP200-2D)
• Works with most other micro amps

Metra 82-6901

Universal 5-1/4" or 6-1/2" Speaker to 6" x 9" Mounting Adapters

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Universal 5-1/4" or 6-1/2" Speaker to 6" x 9" Mounting Adapters

• 5-1/4" or 6-1/2" Speaker to 6" x 9" Mounting Hole Adapters
• Mount your pair of 5-1/4" or 6-1/2" speakers in a 6" x 9" mounting hole

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• 5-1/4" or 6-1/2" Speaker to 6" x 9" Mounting Hole Adapters
• Mount your pair of 5-1/4" or 6-1/2" speakers in a 6" x 9" mounting hole

Metra 72-9000

Speaker Connector for Select Audi/VW Vehicles

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Speaker Connector for Select Audi/VW Vehicles

• Speaker Connector for Select Audi/VW Vehicles
• Quick and easy installation
• No cutting needed
• Plugs directly into the harness

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• Speaker Connector for Select Audi/VW Vehicles
• Quick and easy installation
• No cutting needed
• Plugs directly into the harness

Metra 70-1761 Wiring Harness

Install a new car stereo in select 1986-2024 vehicles from Toyota, Subaru, Scion

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Install a new car stereo in select 1986-2024 vehicles from Toyota, Subaru, Scion

• Direct Connection to the factory harness
• Color coded wires for easy installation
• No cutting or splicing required

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• Direct Connection to the factory harness
• Color coded wires for easy installation
• No cutting or splicing required

Metra 86-9001

1998-2006 Volkswagen/Audi/Mercedes Radio Removal Tool

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1998-2006 Volkswagen/Audi/Mercedes Radio Removal Tool

• Radio removal tool for select 1998-2006 Volkswagen, Audi, and Mercedes vehicles

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• Radio removal tool for select 1998-2006 Volkswagen, Audi, and Mercedes vehicles

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