Garage
Shop
Account Icon
Account
Box Icon
Track
order
Telephone Icon
Call
Help Icon
Help
Door with Arrow Icon
Sign In
  1. Home
  2. Infinity Store
  3. Discontinued Infinity Car Audio & Electronics
  4. Discontinued Infinity Car Amplifiers
  5. Discontinued Infinity Class-D Amplifiers

Discontinued Infinity Class-D Amplifiers

Compact and efficient, Infinity Class-D Amplifiers deliver high-quality sound with minimal distortion.

Filters
Infinity ✕
Like New & Used ✕
Clear Filters
Reset Done
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.
Condition
Like New & Used,

Shop the Category

filter-icon Filters & Sort
You are currently viewing discontinued products.

Infinity K2 Amplifier with Clari-fi Technology (Open Box)

700W Peak (240W RMS) High Performance Kappa Series Class-D 2-Channel 2-Ohm Stable Amplifier with Bluetooth and Clari-Fi Technology

K2 big DISCONTINUED
Go to item page Right Arrow Icon of Right Arrow

Infinity K2 Amplifier with Clari-fi Technology (Open Box)

700W Peak (240W RMS) High Performance Kappa Series Class-D 2-Channel 2-Ohm Stable Amplifier with Bluetooth and Clari-Fi Technology

• Item Condition: Like New Open Box
• 100 Watts RMS x 2 @ 4 ohm
• 120 Watts RMS x 2 @ 2 ohm
• 240 Watts RMS x 1 @ 4 ohm Bridged
• Total Peak Power: 700 Watts
• Bluetooth Streaming
• Clari-fi Technology
• Wired control panel
• Speaker-level (high-level) inputs

• Item Condition: Like New Open Box
• 100 Watts RMS x 2 @ 4 ohm
• 120 Watts RMS x 2 @ 2 ohm
• 240 Watts RMS x 1 @ 4 ohm Bridged
• Total Peak Power: 700 Watts
• Bluetooth Streaming
• Clari-fi Technology
• Wired control panel
• Speaker-level (high-level) inputs

Infinity K600 Kappa Series Amplifier (Open Box)

1500W Peak (600W RMS) High Performance Kappa Series Class-D Monoblock 2-Ohm Stable Car Subwoofer Amplifier

K600 big DISCONTINUED
Go to item page Right Arrow Icon of Right Arrow

Infinity K600 Kappa Series Amplifier (Open Box)

1500W Peak (600W RMS) High Performance Kappa Series Class-D Monoblock 2-Ohm Stable Car Subwoofer Amplifier

• Item Condition: Like New Open Box
• 380 Watts RMS x 1 @ 4 ohm
• 600 Watts RMS x 1 @ 2 ohm
• Total Peak Power: 1500 Watts
• Variable low-pass filter: 32 - 320 Hz
• Sleek, brushed steel industrial design
• Upgradable Firmware via the microUSB port
• Speaker-level (high-level) inputs

• Item Condition: Like New Open Box
• 380 Watts RMS x 1 @ 4 ohm
• 600 Watts RMS x 1 @ 2 ohm
• Total Peak Power: 1500 Watts
• Variable low-pass filter: 32 - 320 Hz
• Sleek, brushed steel industrial design
• Upgradable Firmware via the microUSB port
• Speaker-level (high-level) inputs

Infinity Reference 1600a R/B

(Factory Refurbished) 894W Max, Reference Series Class D Monoblock Amplifier (REF1600A)

1600A big DISCONTINUED
Go to item page Right Arrow Icon of Right Arrow

Infinity Reference 1600a R/B

(Factory Refurbished) 894W Max, Reference Series Class D Monoblock Amplifier (REF1600A)

Reference Series Class D Monoblock Amplifier • 400W x 1 chan. @ 4 ohm • 600W x 1 chan. @ 2 ohm • MOSFET power supply • Gold-plated preamp RCA outputs • Wired remote bass level control included

1

Reference Series Class D Monoblock Amplifier • 400W x 1 chan. @ 4 ohm • 600W x 1 chan. @ 2 ohm • MOSFET power supply • Gold-plated preamp RCA outputs • Wired remote bass level control included

Infinity K5 Amplifier with Clari-fi Technology (Open Box)

2300W Peak (750W RMS) High Performance Kappa Series Class-D 5-Channel 2-Ohm Stable Amplifier with Bluetooth and Clari-Fi Technology

K5-3 big DISCONTINUED
Go to item page Right Arrow Icon of Right Arrow

Infinity K5 Amplifier with Clari-fi Technology (Open Box)

2300W Peak (750W RMS) High Performance Kappa Series Class-D 5-Channel 2-Ohm Stable Amplifier with Bluetooth and Clari-Fi Technology

• Item Condition: Like New Open Box
• 75 Watts RMS x 4 @ 4 ohm
• 100 Watts RMS x 4 @ 2 ohm
• 200 Watts RMS x 2 @ 4 ohm Bridged
• Subwoofer Channel: 4 ohm: 200 watts x 1 chan.
• 2 ohm: 350 watts x 1 chan.
• Total Peak Power: 1500 Watts
• Bluetooth Streaming
• Clari-fi Technology
• Wired control panel
• Speaker-level (high-level) inputs

2

• Item Condition: Like New Open Box
• 75 Watts RMS x 4 @ 4 ohm
• 100 Watts RMS x 4 @ 2 ohm
• 200 Watts RMS x 2 @ 4 ohm Bridged
• Subwoofer Channel: 4 ohm: 200 watts x 1 chan.
• 2 ohm: 350 watts x 1 chan.
• Total Peak Power: 1500 Watts
• Bluetooth Streaming
• Clari-fi Technology
• Wired control panel
• Speaker-level (high-level) inputs

Infinity Reference 1600a Open Box

(Open Box) Max, Reference Series Class D Monoblock Amplifier (REF1600A)

1600A big DISCONTINUED
Go to item page Right Arrow Icon of Right Arrow

Infinity Reference 1600a Open Box

(Open Box) Max, Reference Series Class D Monoblock Amplifier (REF1600A)

Reference Series Class D Monoblock Amplifier • 400W x 1 chan. @ 4 ohm • 600W x 1 chan. @ 2 ohm • MOSFET power supply • Gold-plated preamp RCA outputs • Wired remote bass level control included

Reference Series Class D Monoblock Amplifier • 400W x 1 chan. @ 4 ohm • 600W x 1 chan. @ 2 ohm • MOSFET power supply • Gold-plated preamp RCA outputs • Wired remote bass level control included

Infinity K4 Amplifier with Clari-fi Technology (Open Box)

1500W Peak (480W RMS) High Performance Kappa Series Class-D 4-Channel 2-Ohm Stable Amplifier with Bluetooth and Clari-Fi Technology

K4-2 big DISCONTINUED
Go to item page Right Arrow Icon of Right Arrow

Infinity K4 Amplifier with Clari-fi Technology (Open Box)

1500W Peak (480W RMS) High Performance Kappa Series Class-D 4-Channel 2-Ohm Stable Amplifier with Bluetooth and Clari-Fi Technology

• Item Condition: Like New Open Box
• 100 Watts RMS x 4 @ 4 ohm
• 120 Watts RMS x 4 @ 2 ohm
• 240 Watts RMS x 2 @ 4 ohm Bridged
• Total Peak Power: 1500 Watts
• Bluetooth Streaming
• Clari-fi™ Technology
• Wired control panel
• Speaker-level (high-level) inputs

• Item Condition: Like New Open Box
• 100 Watts RMS x 4 @ 4 ohm
• 120 Watts RMS x 4 @ 2 ohm
• 240 Watts RMS x 2 @ 4 ohm Bridged
• Total Peak Power: 1500 Watts
• Bluetooth Streaming
• Clari-fi™ Technology
• Wired control panel
• Speaker-level (high-level) inputs

Infinity Reference 1300a R/B

(Factory Refurbished) 342W Max, Reference Series Class D Monoblock Amplifier (REF1300A)

1300a big DISCONTINUED
Go to item page Right Arrow Icon of Right Arrow

Infinity Reference 1300a R/B

(Factory Refurbished) 342W Max, Reference Series Class D Monoblock Amplifier (REF1300A)

Reference Series Class D Monoblock Amplifier • 200W x 1 chan. @ 4 ohm • 300W x 1 chan. @ 2 ohm • 342W x 1 chan. Max • MOSFET power supply • Gold-plated preamp RCA outputs • Wired remote bass level control included

3

Reference Series Class D Monoblock Amplifier • 200W x 1 chan. @ 4 ohm • 300W x 1 chan. @ 2 ohm • 342W x 1 chan. Max • MOSFET power supply • Gold-plated preamp RCA outputs • Wired remote bass level control included

Infinity KAPPA FOUR Open Box

(Open Box) 1200W Max, Kappa Series 4-Channel Amplifier (KAPPA-FOUR)

DO-NOT-USE-KAPPA-FOUR big DISCONTINUED
Go to item page Right Arrow Icon of Right Arrow

Infinity KAPPA FOUR Open Box

(Open Box) 1200W Max, Kappa Series 4-Channel Amplifier (KAPPA-FOUR)

Kappa Series 4-Channel Amplifier • 125W x 4 Chan. @ 4 Ohm • 150W x 4 Chan. @ 2 Ohm • 300W x 4 Chan. Max • Tuned Bass EQ • Speaker-level Inputs • Variable High and Low Pass Filters • 4/3/2 Channel Operation

Kappa Series 4-Channel Amplifier • 125W x 4 Chan. @ 4 Ohm • 150W x 4 Chan. @ 2 Ohm • 300W x 4 Chan. Max • Tuned Bass EQ • Speaker-level Inputs • Variable High and Low Pass Filters • 4/3/2 Channel Operation

Infinity Reference 1300a Open Box

(Open Box) 342W Max, Reference Series Class D Monoblock Amplifier (REF1300A)

1300a big DISCONTINUED
Go to item page Right Arrow Icon of Right Arrow

Infinity Reference 1300a Open Box

(Open Box) 342W Max, Reference Series Class D Monoblock Amplifier (REF1300A)

Reference Series Class D Monoblock Amplifier • 200W x 1 chan. @ 4 ohm • 300W x 1 chan. @ 2 ohm • 342W x 1 chan. Max • MOSFET power supply • Gold-plated preamp RCA outputs

Reference Series Class D Monoblock Amplifier • 200W x 1 chan. @ 4 ohm • 300W x 1 chan. @ 2 ohm • 342W x 1 chan. Max • MOSFET power supply • Gold-plated preamp RCA outputs

Infinity Kappa Four (Like New (Open Box))

1500W Peak (480W RMS) Kappa Series Class-D 4-Channel Amplifier

Kappa Four big DISCONTINUED
Go to item page Right Arrow Icon of Right Arrow

Infinity Kappa Four (Like New (Open Box))

1500W Peak (480W RMS) Kappa Series Class-D 4-Channel Amplifier

• 100 watts x 4 channel @ 4 ohm
• 120 watts x 4 channel @ 2 ohm
• Bridged: 240 watts x 2 channel @ 4 ohm
• Total RMS Power: 480 watts
• Class D 2 ohm Stable 4-Channel Amplifier

• 100 watts x 4 channel @ 4 ohm
• 120 watts x 4 channel @ 2 ohm
• Bridged: 240 watts x 2 channel @ 4 ohm
• Total RMS Power: 480 watts
• Class D 2 ohm Stable 4-Channel Amplifier

Infinity Kappa Perfect 3002A - New (Damaged Packaging, Product A+)

750W Peak (300W RMS) Class D Kappa Series 2 Channel Powersports Amplifier

KAPPA 3002A big DISCONTINUED
Go to item page Right Arrow Icon of Right Arrow

Infinity Kappa Perfect 3002A - New (Damaged Packaging, Product A+)

750W Peak (300W RMS) Class D Kappa Series 2 Channel Powersports 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 D 2 ohm Stable 2-Channel 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 D 2 ohm Stable 2-Channel Amplifier

Infinity Kappa One 6 (KAPPAONE6AM) (Like New (Open Box))

1500W Peak (600W RMS) Class D Kappa Series Monoblock Car Amplifier with Bass Remote

Kappa One 6-2 big DISCONTINUED
Go to item page Right Arrow Icon of Right Arrow

Infinity Kappa One 6 (KAPPAONE6AM) (Like New (Open Box))

1500W Peak (600W RMS) Class D Kappa Series Monoblock Car Amplifier with Bass Remote

• 380 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

• 380 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

Infinity Kappa One K (KAPPAONEKAM) (Open Box, Good)

2600W Peak (1000W RMS) Kappa Series Class-D Monoblock Amplifier with Bass Remote

Kappa One K-2 big DISCONTINUED
Go to item page Right Arrow Icon of Right Arrow

Infinity Kappa One K (KAPPAONEKAM) (Open Box, Good)

2600W Peak (1000W RMS) Kappa Series Class-D Monoblock Amplifier with Bass Remote

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

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

Infinity INFDSP6840 - New (Damaged Packaging, Product A+)

1000W Peak (480W RMS) DSP Series Class-D 8-Channel Amplifier with Digital Signal Processing (DSP)

DSP6840AM-2 big DISCONTINUED
Go to item page Right Arrow Icon of Right Arrow

Infinity INFDSP6840 - New (Damaged Packaging, Product A+)

1000W Peak (480W RMS) DSP Series Class-D 8-Channel Amplifier with Digital Signal Processing (DSP)

• 40 watts x 8 channel @ 4 ohm
• 60 watts x 8 channel @ 2 ohm
• Total RMS Power: 480 watts
• Class D 2 ohm Stable 8-Channel Amplifier

• 40 watts x 8 channel @ 4 ohm
• 60 watts x 8 channel @ 2 ohm
• Total RMS Power: 480 watts
• Class D 2 ohm Stable 8-Channel Amplifier

 
    Clear all
    why-shoping-with-sonic

    We love people and we're ready to help you! See what separates us from our competition.

    Take advantage of our VIP rewards like 10% back on your purchases, free 2-day shipping, extended warranties, and free returns! Gain access to all of these rewards without any membership fees.
    Get great discounted (and possibly FREE) installation accessories with most car stereo purchases. This includes dash kits, wiring harnesses and antenna adapters that you will need to properly install your new car stereo.
    We are an Authorized Dealer for all the brands we sell, including the most premium brands in car and marine audio such as Hertz, JL Audio, NVX, Rockford Fosgate, Kicker, Alpine, Kenwood and many more.
    Shop Deals and get up to 30% off premium brands! Shop Now! We are always looking out for the best products and deals to offer our customers. Don’t pay too much by shopping elsewhere!
    We have information on brands, gear, and more for you to explore! Check out our YouTube Channel for helpful how-to videos, product reviews, and Q&As. For a more detailed look, also visit our Learning Center!
    Our trained experts are here to assist you! They are just a phone call or click away to help you get the right gear for you and your vehicle!
    Why Shop With Us?
    Save up to 10 different vehicles in your garage
    Vehicle
    Store     Delete

    2013 Ram 3500

    2007 Lexus IS250

    Add vehicle Clear all vehicles
    Where to find vehicle info
    Are you sure you want to clear your garage?
    This action cannot be undone. Confirm

    Cancel

    This page was not designed for products.
    If you continue, you will be redirected to a category customized for your vehicle. Continue

    Cancel

    Shop your 2013 3500
    Why Use a Vehicle Fit Guide?
    Change vehicle | Shop without vehicle
    Whoa! Slow down. Add your details below!
    additional information required
    Add vehicle details to confirm fitment
    Ignore fitment details
    Find stereos and more that work -- fast.

    Additional information:

    Remove

    Can't find your vehicle? Click here and we'll help.

    Where to find vehicle info

    Go to Fitment

    Didn't find your car?

    Submit your details and we'll help!
    Please enter the letters as they are shown in the image above. Letters are not case-sensitive.
    Identify your vehicle and submodel details
    • Owner's manual
    • Vehicle's insurance card
    • Vehicle registration
    • Vehicle produced after 2005: Inside driver's side door
    • Vehicle produced before 2005: Rear passenger doorjamb, glove box, center console, or engine compartment
    Car Info Side Door Icon
    Vehicle Registration Icon
    Vehicle Insurance Icon
    Back

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

    • You see only parts engineered for your exact vehicle
    • You avoid incompatible radios, speakers, or wiring
    • Installation is smoother, faster, and frustration-free
    • You get the correct accessories the first time

    Whether you're replacing a factory stereo or upgrading your entire audio system, the Fit Finder eliminates uncertainty.

    Back
    Track your order
    Call our experts
    Support Center
    Return & Exchanges
    Follow on Instagram Instagram logo
    Subscribe on YouTube YouTube logo