Upgrading the audio in a Subaru WRX starts with the right amplifier. The best choice depends on whether you want stronger bass, cleaner full-range sound, or a simple factory-radio integration.
This roundup highlights 10 practical options for different budgets and setups, so you can match your amplifier to your WRX build without overbuying or underpowering the system.
Best 10 Car Amplifiers for Subaru Wrx Picks for 2026
High-Power Budget Mono Amp
BOSS R1100M Monoblock Car Amplifier
- 1100 max x 1 at 2 ohms
- RCA and speaker-level inputs
- Low-pass filter with bass boost
Best For: WRX owners who want an affordable mono amp for a subwoofer
Plug-and-Play Subaru Adapter
Factory OEM Stereo Amp Interface
- RCA output and remote turn-on wire
- No cutting or splicing required
- Fits select 2016-2021 WRX models
Best For: WRX drivers with a factory non-amplified stereo who want an easy amp integration harness
Compact Subwoofer Amp
Skar Audio RP-350.1D Mono Amplifier
- 350 watts RMS at 1 ohm
- Class D with remote level control
- Bass EQ and 4-way protection
Best For: WRX owners wanting a compact, efficient mono amp for a modest subwoofer system
OEM Harness Upgrade
NuIth Subaru Amp Adapter Interface
- 2-channel RCA output converter
- No-cut OEM wiring harness install
- Fits select 2008-2013 WRX models
Best For: WRX owners with a non-amplified factory radio who want a simple RCA output harness
Compact Subwoofer Power
Skar Audio RP-800.1D 800W Mono Amp
- 800W RMS at 1 ohm, 1,200W peak
- Remote subwoofer level control included
- Bass EQ boost at 45 Hz with protection circuitry
Best For: A WRX subwoofer amp with adjustable bass control
Simple Speaker Upgrade
Pioneer GM-A3702 2-Channel Amp
- 500W max output, 60W RMS x 2 at 2 ohms
- Bridgeable to 190W RMS x 1
- Auto signal sensing plus high-/low-pass filtering
Best For: A simple 2-channel amp for speaker upgrades
Full-Range System Builder
Skar Audio RP-150.4AB 4-Channel Amp
- 250W x 4 RMS at 2 ohms
- 20 Hz to 20,000 Hz full-range response
- 4-way protection and 4-gauge input terminals
Best For: A 4-channel amp for front and rear speaker power
Compact 4-Channel Pick
Pyle 2000W Bridgeable MOSFET Amp
- 2000W bridgeable output
- Silver-plated RCA ports
- Thermal, overload, and short-circuit protection
Best For: WRX owners who want a slim, bridgeable 4-channel amp with tuning controls
Full-Range Power Option
- Full-range Class A/B design
- Bridgeable with MOSFET power supply
- Variable gain and bass boost controls
Best For: WRX owners looking for a full-range amp that can support both speakers and subwoofers
Slim 2-Channel Budget Pick
Pyle 1400W Bridgeable MOSFET Amp
- 1400W bridgeable output
- Gold-plated RCA inputs and outputs
- Slim 1.38-inch design with protection features
Best For: WRX owners who want a compact 2-channel amp for a straightforward install
High-Power Budget Mono Amp – BOSS R1100M Monoblock Car Amplifier
If you’re shopping car amplifiers for subaru wrx and want a straightforward way to drive a subwoofer, the BOSS R1100M is a compact monoblock option with RCA and speaker-level inputs. It offers 2-8 ohm stability, a low-pass crossover, bass boost, and remote subwoofer control, making it a practical match for simple bass-focused upgrades.
Best For: WRX owners who want an affordable mono amp for a subwoofer upgrade with flexible input options.
Pros:
- 1100 max x 1 at 2 ohms, with 550 max x 1 at 4 ohms
- RCA and speaker-level inputs support easier integration
- Low-pass filter, bass boost, and remote subwoofer control included
- Thermal, short, and overload protection circuits add peace of mind
Cons:
- Monoblock design is only for a subwoofer, not full-range speakers
- Class A/B design may be less efficient than Class D alternatives
- Best suited to simple bass installs rather than advanced tuning setups
This is a no-frills choice for adding bass without a complicated install. The included high input cable and remote level control make it easier to get started, while the 6-year warranty is a notable bonus when bought through Amazon.
Plug-and-Play Subaru Adapter – Factory OEM Stereo Amp Interface
For car amplifiers for subaru wrx, this amplifier adapter interface is designed to make an aftermarket amp install cleaner by connecting at the back of the radio. It provides RCA output and a remote turn-on wire, and it avoids cutting or splicing factory wiring, which is especially useful if you want a tidy OEM-style setup.
Best For: WRX drivers with a factory non-amplified stereo who want an easy amp integration harness.
Pros:
- Plug-and-play design helps speed up installation
- Provides RCA output plus remote amp turn-on wire
- Adjustable gain output for easier level matching
- Works with select Subaru models, including 2016-2021 WRX
Cons:
- Not compatible with factory amplified systems
- Vehicle compatibility is limited to specific model years and trims
- Only suitable for non-premium OEM audio setups
This is a helpful add-on if you want to integrate an amplifier without reworking the factory harness. Just verify your WRX has a non-amplified system before buying, since compatibility is the key limitation.
Compact Subwoofer Amp – Skar Audio RP-350.1D Mono Amplifier
Skar Audio RP-350.1D Monoblock Class D MOSFET Amplifier with Remote Subwoofer Level Control, 350W
Check Price On AmazonIf you’re comparing car amplifiers for subaru wrx and only need power for a subwoofer, the Skar RP-350.1D is a compact Class D monoblock with 350 watts RMS at 1 ohm. It adds a bass EQ switch, remote subwoofer level control, and 4-way protection circuitry, making it a focused option for small to mid-size bass setups.
Best For: WRX owners wanting a compact, efficient mono amp for a modest subwoofer system.
Pros:
- 350 watts RMS at 1 ohm with Class D efficiency
- Remote subwoofer level control included
- On-board bass EQ switch with +6 or +12 dB boost at 45 Hz
- 4-way protection circuitry and 8 AWG terminals
Cons:
- Single-channel design is only for subwoofer use
- 350-watt RMS output may be modest for larger systems
- At 12.75 inches long, it is not the smallest amp in the group
This amp makes sense when you want a clean, efficient way to add bass without oversizing the system. It is a solid pick for simpler WRX audio upgrades where reliability and compact power matter more than maximum output.
OEM Harness Upgrade – NuIth Subaru Amp Adapter Interface
For car amplifiers for subaru wrx, this NuIth adapter is built to help you add an amp or subwoofer to a factory OEM radio system with a cleaner install. It offers 2-channel RCA output, a remote turn-on wire, and a no-cut harness design, but it is limited to non-amplified systems and specific Subaru fitments.
Best For: WRX owners with a non-amplified factory radio who want a simple RCA output harness.
Pros:
- 2-channel RCA output converter for amp or subwoofer integration
- No cutting of the OEM wiring harness required
- Includes a power wire for remote amplifier turn-on
- Compatible with 2008-2013 WRX without OE navigation
Cons:
- Not compatible with vehicles that already have a factory amplifier
- Fitment is limited to select Subaru years and configurations
- Only works with non-Bose, non-JBL, non-premium audio systems
This is a practical integration piece if your WRX uses a supported OEM radio and you want to keep the install neat. It is most useful as a wiring helper rather than a performance upgrade on its own.
Compact Subwoofer Power – Skar Audio RP-800.1D 800W Mono Amp
Skar Audio RP-800.1D Monoblock Class D MOSFET Amplifier with Remote Subwoofer Level Control, 800W
Check Price On AmazonIf you’re shopping for car amplifiers for subaru wrx and want a dedicated subwoofer setup, the Skar Audio RP-800.1D is built for that job. This Class D monoblock amp is stable at 1 ohm, includes remote subwoofer level control, and gives you on-board bass EQ options so you can tune low-end output without overcomplicating the install.
Best For: Drivers adding a strong, adjustable mono amp for a subwoofer-focused WRX build.
Pros:
- 800 watts RMS at 1 ohm with 1,200 watts peak power
- Remote subwoofer level control included for quick bass adjustments
- On-board bass EQ switch with +6 or +12 dB boost at 45 Hz
- 4-way protection circuitry and 4-gauge power/ground terminals
Cons:
- Single-channel design only supports subwoofer use
- Not intended for full-range speaker amplification
This amp makes sense if your WRX build is centered on clean, controllable sub power. The efficient Class D design and protection features add practical value, while the bass EQ and remote control help you dial in output from the driver’s seat.
Simple Speaker Upgrade – Pioneer GM-A3702 2-Channel Amp
For car amplifiers for subaru wrx builds that need a straightforward way to wake up factory or upgraded speakers, the Pioneer GM-A3702 is a practical 2-channel option. It delivers 500 watts max output, uses a Class AB design, and includes automatic signal sensing and turn-on for easier integration.
Best For: Compact two-channel power for a clean front-stage speaker upgrade in a WRX.
Pros:
- 500 watts max output with 60 watts RMS x 2 at 2 ohms
- Bridgeable design provides 190 watts RMS x 1 in bridged mode
- Automatic signal sensing and turn-on simplify use
- Built-in high-/low-pass filtering helps tailor the sound
Cons:
- Only two channels, so it is not a full-system solution
- Class AB design is less focused on subwoofer duty than a mono amp
This is a sensible choice if you want reliable two-channel power without extra complexity. Its filter options and bridgeable layout make it flexible for common WRX speaker upgrades, especially when you want cleaner output from the head unit’s signal.
Full-Range System Builder – Skar Audio RP-150.4AB 4-Channel Amp
If you’re comparing car amplifiers for subaru wrx and want to run multiple speakers, the Skar Audio RP-150.4AB is designed as a full-range 4-channel amp. It offers 250 watts x 4 at 2 ohms, a 20 Hz to 20,000 Hz frequency response, and 4-way protection circuitry, making it a flexible match for multi-speaker setups.
Best For: Powering front and rear speakers in a WRX with a single 4-channel amplifier.
Pros:
- 250 watts x 4 RMS at 2 ohms for multi-speaker setups
- Full-range 20 Hz to 20,000 Hz frequency response
- 4-way protection circuitry for added reliability
- 4-gauge power and ground input terminals for strong current flow
Cons:
- Large 4-channel layout may be more than you need for a basic upgrade
- Heavier than the smaller mono and 2-channel options listed here
This amplifier fits best when your WRX build needs one amp to cover multiple speakers instead of just a sub. The high RMS output and broad frequency response make it a versatile pick for balanced, full-range sound.
Compact 4-Channel Pick – Pyle 2000W Bridgeable MOSFET Amp
If you’re shopping for car amplifiers for Subaru WRX, this Pyle 4-channel model is a practical option when you want flexible system tuning without a bulky chassis. It offers bridgeable output, variable gain control, a configurable electronic crossover, and bass boost control, so you can tailor the setup to your speakers or add extra low-end support.
Best For: WRX owners who want a slim, bridgeable 4-channel amp with tuning controls and built-in protection.
Pros:
- Up to 2000W bridgeable output for flexible system setups
- Silver-plated RCA ports designed to help reduce signal loss
- MOSFET power supply with thermal, overload, and short-circuit protection
- Compact 2.21-inch tall design that should be easier to place in tight spaces
Cons:
- Only 4 channels, so it may not suit every multi-amp layout
- Install location still needs to be planned carefully despite the slim size
For a WRX build that needs a compact amp with useful tuning controls, the PLA4278 gives you a lot of flexibility in a small footprint. It’s a sensible pick if you want protection features and bridgeable output without overcomplicating the install.
Full-Range Power Option – BOSS PF1800 4-Channel Amp
Among car amplifiers for Subaru WRX, the BOSS PF1800 stands out if you want a full-range 4-channel amp that can run speakers and also handle subwoofers. Its Class A/B design, MOSFET power supply, variable gain control, and variable bass boost make it a versatile choice for a mixed audio setup.
Best For: WRX owners looking for a full-range amp that can support both speakers and subwoofers.
Pros:
- Full-range design works with speakers and subwoofers
- Bridgeable 4-channel layout for more output flexibility
- MOSFET power supply with variable gain and bass boost
- 6-year Platinum Online Dealer Warranty when sold/shipped by Amazon.com
Cons:
- Best results may require professional installation, according to the listing
- Heavier than the slimmer Pyle option at 12 lbs
If you want one amp to do more of the work in your WRX, this PF1800 is built around flexibility rather than minimal size. The full-range design and bridgeable channels make it a strong fit for systems that need speaker and subwoofer support in one package.
Slim 2-Channel Budget Pick – Pyle 1400W Bridgeable MOSFET Amp
If you’re comparing car amplifiers for Subaru WRX and want a simple, slim 2-channel setup, the Pyle PLA2200 is built for compact installs. It delivers bridgeable output, a configurable electronic crossover, bass boost control, gold-plated RCA inputs and outputs, and a MOSFET power supply for distortion-free signal handling.
Best For: WRX owners who want a compact 2-channel amp for a straightforward install.
Pros:
- Compact 1.38-inch tall design that should fit easier in tight spaces
- Up to 1400W bridgeable output for flexible use
- Gold-plated RCA ports and low level inputs
- Thermal, overload, and short-circuit protection for added safety
Cons:
- Only 2 channels, so it’s less flexible than 4-channel amps
- Warranty details are less specific in the supplied notes
The PLA2200 makes sense if your WRX build calls for a small amp with straightforward controls and protection features. It doesn’t try to do everything, but its slim form factor and bridgeable design make it easy to work into a simpler audio setup.
How We Picked the Best Car Amplifiers for Subaru Wrx
We focused on amps and interface solutions that make sense for Car Amplifiers for Subaru Wrx owners: enough output for daily listening, stable performance with common speaker loads, and features that simplify installation. We also considered whether each option works better for a subwoofer, a full-range speaker setup, or a factory head unit.
Because WRX installs often need a balance of sound quality and practicality, we gave extra weight to models with bridgeable channels, speaker-level inputs, remote bass control, and OEM-friendly integration.
Quick Comparison
For bass-focused builds, monoblock Class D amplifiers are usually the most efficient choice. For driving door speakers or a complete system, 2-channel and 4-channel amps are more flexible. If you want to keep the factory radio, an amplifier adapter interface can make integration much easier and help preserve OEM functions.
Typical Use Cases
Choose a smaller monoblock if you only want to wake up a single subwoofer. Move to a stronger monoblock if you plan to run more output or want extra headroom. Pick a 4-channel amp if you are upgrading front and rear speakers or plan to bridge channels for a stronger two-speaker setup.
Key Buying Factors for Car Amplifiers for Subaru Wrx
Power match: Check RMS power, not just peak watts. Match the amp to your speaker or subwoofer’s real continuous rating for clean output and less distortion.
Channel count: Monoblock amps are best for subwoofers. Two-channel amps work well for fronts or bridged speaker setups. Four-channel amps are better for full-system upgrades.
Installation path: If your WRX keeps the factory head unit, look for high-level inputs or a compatible adapter interface. This can save time and reduce wiring complexity.
Impedance stability: Make sure the amp is stable at the ohm load you plan to run. This matters a lot when wiring subwoofers in parallel or bridging channels.
Control and tuning: Features like low-pass crossover, bass boost, and remote level control help you fine-tune the system after installation.
Physical fit and cooling: WRX installs can be tight, so compact amps and good heat management are valuable for reliability.
Who Should Buy Which Car Amplifiers for Subaru Wrx?
Bass-first buyers: Choose a monoblock Class D amp if your main goal is louder, cleaner subwoofer output.
Daily drivers: A modest 2-channel or 4-channel amp is ideal if you want a noticeable upgrade without overcomplicating the install.
Factory-radio owners: Prioritize an adapter interface if you want the easiest path to adding power while keeping the OEM stereo system.
Full-system builders: Select a stronger 4-channel amp if you plan to power multiple speakers and want more flexibility for future upgrades.
In short, the best Car Amplifiers for Subaru Wrx depend on whether you are building around bass, speaker clarity, or seamless factory integration. Matching the amp type to your exact setup will deliver better sound and a smoother install.