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CEA-2006 Compliant:

Monoblock Amplifiers Minimum Impedance Bridged: Not Bridgeable

Includes 4 Gauge Wiring Kit with 1800W Max V-Drive Series Class D Single Channel Mono Amplifier

• Includes 4 Gauge Wiring Kit
• Peak: 450W x 1 @ 4 ohms, 900W x 1 @ 2 ohms, 1800W x 1 @ 1 ohm
• Total Peak Power: 1800W
• Wired Bass Level Remote
• Bass Boost: 0-10 dB
• Illuminated Badge and Heatsink
• Dimensions: 12-3/16"L x 9-1/2"W x 2-1/8"H

$129.99

IN STOCK

5000W Max Phantom Series Class D Monoblock Power Amplifier + 0/1 Gauge Wiring Kit with RCA Cables

• 1 ohm: 5000 watts x 1 chan.
• RMS power output: 1800 watts x 1 chan.
• Wired remote subwoofer level control
• Nickel-plated speaker and power terminals
• Subsonic Filter
• 1/0 Gauge Complete 2-Channel Amplifier Installation Kit

$189.99

IN STOCK

1000W Single Channel Monoblock Reference MYKRO Series Hybrid Class D Car Power Amplifier

• RMS: 400W x 1 @ 4 ohms, 700W x 1 @ 2 ohms, 1000W x 1 @ 1 ohm
• Total RMS Power: 1000W
• Wired Bass Remote Included
• Bass Boost: 0-12 dB
• Preamp RCA Outputs
• Dimensions: 6-1/2"W x 10-1/4"D x 1-15/16"H

FREE 4 Gauge Amp Kit with purchase!

$259.99

IN STOCK

Only 3 Left!

500W RMS Constant Power Series Class BD Monoblock Amplifier

• RMS: 300W x 1 @ 4 ohms, 500W x 1 @ 2 ohms, 500W x 1 @ 1 ohm
• Dynamic Power Output: 690W
• CEA-2006 Compliant
• Variable Bass Boost: 0 to +18 dB at 45 Hz
• Ultra Efficient Class bD Circuitry
• Dimensions: 11-7/16"L x 8-3/16"W x 2-3/16"H

$479.99

IN STOCK

2000W RMS Class D Monoblock Car Power Amplifier

• Peak: 1200W x 1 @ 4 ohms, 1500W x 1 @ 2 ohms, 2000W x 1 @ 1 ohm
• Total Peak Power: 3500W
• Wired Bass Remote Included
• Bass Boost: 0-18 dB
• Class D Circuitry
• Dimensions: 9"W x 12-3/4"D x 2-1/2"H

25% off a 4 Gauge Amp Kit with Purchase

$149.99

IN STOCK

2500W Max V-Drive Series Class D Single Channel Monoblock Car Audio Amplifier

• Peak: 625W x 1 @ 4 ohms, 1250W x 1 @ 2 ohms, 2500W x 1 @ 1 ohm
• Total Peak Power: 2500W
• Wired Bass Level Remote
• Bass Boost: 0-10 dB
• Illuminated Badge and Heatsink
• Dimensions: 13-3/4"L x 9-1/2"W x 2-1/8"H

50% off NVX 2-Channel RCA Cables w/ purchase!

$119.95

IN STOCK

Only 3 Left!

1000W RMS Power Series Constant Power Monoblock Class BD Amplifier

• RMS: 700W x 1 @ 4 ohms, 1000W x 1 @ 2 ohms, 1000W x 1 @ 1 ohm
• Total RMS Power: 1000W
• CEA-2006 Compliant
• Variable Bass Boost: 0 to +18 dB at 45 Hz
• Ultra Efficient Class bD Circuitry
• Dimensions: 13-11/16"L x 8-3/16"W x 2-3/16"H

FREE Bass Reconstruction Sound Processor w/ Amp!

$699.99

AVAILABLE

Ships at Later Date

5500W Max, Class D Monoblock Amplifier

FX1 Series 1-Channel Class D Car Amplifier • 1700W x 1 chan. @ 4 ohms • 2500W x 1 chan. @ 2 ohms • 3200W x 1 chan. @ 1 ohm • 5500W x 1 chan. Max • Nickel Plated Heavy Duty Power & Speaker Terminals

25% off 0/1 Gauge Amp Kit with Select Amplifiers!

$199.99

IN STOCK

320W RMS LP Series Class AB Monoblock Car Amplifier

• Peak: 200W x 1 @ 4 ohms, 320W x 1 @ 2 ohms
• Total RMS Power: 320W
• Wired Bass Remote Included
• Variable Bass Boost: 0 to +15 dB
• High-Level Inputs
• Dimensions: 5-1/2"W x 12"D x 2"H

25% off a 8 Gauge Amp Kit with Purchase

$159.99

IN STOCK

Only 2 Left!

450W RMS Axis Series Class AB Monoblock Car Amplifier

• RMS: 450W x 1 @ 4 ohms
• Total Peak Power: 1500W
• Wired Bass Knob Included
• Switchable Bass Boost: 0 or +18 dB at 50 Hz
• High-Level Inputs
• Dimensions: 10-5/8"W x 9-7/16"D x 2-7/16"H

$61.95

AVAILABLE

Ships at Later Date

900W Atom Series Monoblock Class D Car Amplifier

• RMS Power: 300W x 1 @ 4 ohms, 450W x 1 @ 2 ohms
• Total Peak Power: 900W
• Variable Low-Pass Filter (35-250 Hz, 24 dB/octave)
• Dimensions: 5"W x 7.2"L x 1.5"H

$149.99

IN STOCK

Only 1 Left!

2000W HED Series Monoblock Class D Amplifier

• RMS Power: 1000W x 1 @ 1 ohms
• Total Peak Power: 2000W
• Variable Low-Pass Filter
• Pulse Width Modulated MOSFET Power Supply
• Heavy-Grade Aluminum Alloy Extruded Heatsink

50% off a NVX True 1/0 Gauge Amp Kit with Purchase!

$249.99

IN STOCK

1500W Mt.Olympus Series Monoblock Class D Car Amplifier

• RMS Power: 600W x 1 @ 4 ohms, 1100W x 1 @ 2 ohms, 1500W x 1 @ 1 ohm
• Total Peak Power: 3000W
• Variable Low-Pass Filter (35-250 Hz)

FREE Bass Reconstruction Sound Processor w/ Amp!

$399.99

IN STOCK

Only 1 Left!

1100W HED Series Monoblock Class D Amplifier

• RMS Power: 500W x 1 @ 1 ohms
• Total Peak Power: 1100W
• Variable Low-Pass Filter
• Pulse Width Modulated MOSFET Power Supply
• Heavy-Grade Aluminum Alloy Extruded Heatsink

25% off a NVX True 1/0 Gauge Amp Kit with Purchase!

$179.99

IN STOCK

1200W RMS KX Series Monoblock Class D Car Power Amplifier

• RMS: 600W x 1 @ 4 ohms, 1200W x 1 @ 2 ohms
• Total Peak Power: 2400W
• CEA-2006 Compliant
• Kick EQ+ Bass Boost: 0-18 dB from 20-80 Hz
• Magnetic Panel Covers Controls
• Dimensions: 8-5/16"W x 9-9/16"L x 2-1/8"H

FREE $100.00 Gift Card with Purchase!

$579.95

IN STOCK

Only 3 Left!

800W RMS Class D Monoblock SK Series Car Amplifier

• RMS: 340W x 1 @ 4 ohms, 570W x 1 @ 2 ohms, 820W x 1 @ 1 ohm
• Total RMS Power: 820W
• Class D Circuitry
• Variable Bass Boost: 0 to +9 dB at 45 Hz
• Wired Bass Remote Included
• Dimensions: 9-1/2"W x 11-3/16"D x 2-9/16"H

Save 50% on the NVX Bass Expanding Processor w/ Purchase!

$279.99

IN STOCK

Only 2 Left!

1500W Mono Block Onyx Series Class D Amplifier

• RMS: 475W x 1 @ 4 ohms, 750W x 1 @ 2 ohms, 1000W x 1 @ 1 ohm
• Total Peak Power: 1000W
• Fluid-Fets MOSFET Power Supply
• Q-Stasis Pre-Amplifier Stage
• Heavy Duty Aluminum Alloy Heat-Sink
• Dimensions: 9.50"W x 14.41"L x 2.34"H

Save 10% on a Trunk/Cabin Sound Damping Kit!

$179.99

IN STOCK

Only 2 Left!

550W RMS LP Series Class D Monoblock Single Channel Car Amplifier

• Peak: 350W x 1 @ 4 ohms, 420W x 1 @ 2 ohms, 550W x 1 @ 1 ohm
• Total RMS Power: 550W
• Wired Bass Remote Included
• Variable Bass Boost: 0 to +15 dB
• Class D Circuitry
• Dimensions: 5-1/2"W x 12"D x 2"H

Save 50% on the NVX Bass Expanding Processor w/ Purchase!

$209.99

IN STOCK

Only 3 Left!

1400W RMS Monoblock Class D T-Series Car Amplifier

• RMS: 350W x 1 @ 4 ohms, 700W x 1 @ 2 ohms, 1400W x 1 @ 1 ohm
• Total RMS Power: 1400W
• 1 Pair of Preamp Outputs
• Dimensions: 9-7/8" W x 13-3/8" L x 2-1/16" H

50% off a 0/1 Gauge Amp Kit with Select Amplifiers!

$314.99

IN STOCK

Only 3 Left!

2000W Mono Block Onyx Series Class D Amplifier

• RMS: 650W x 1 @ 4 ohms, 1300W x 1 @ 2 ohms, 2000W x 1 @ 1 ohm
• Total Peak Power: 2000W
• Fluid-Fets MOSFET Power Supply
• Q-Stasis Pre-Amplifier Stage
• Heavy Duty Aluminum Alloy Heat-Sink
• Dimensions: 9.50"W x 18.35"L x 2.34"H

Save 10% on a Trunk/Cabin Sound Damping Kit!

$229.99

IN STOCK

Only 2 Left!

750W RMS LP Series Class D Monoblock Single Channel Car Amplifier

• Peak: 350W x 1 @ 4 ohms, 600W x 1 @ 2 ohms, 750W x 1 @ 1 ohm
• Total RMS Power: 750W
• Wired Bass Remote Included
• Variable Bass Boost: 0 to +15 dB
• Class D Circuitry
• Dimensions: 5-1/2"W x 13-9/16"D x 2"H

$234.99

IN STOCK

Only 2 Left!

2500W RMS Constant Power Series Class BD Monoblock Amplifier

• RMS: 1500W x 1 @ 4 ohms, 2500W x 1 @ 2 ohms, 2500W x 1 @ 1 ohm
• Total RMS Power: 2500W
• CEA-2006 Compliant
• Variable Bass Boost: 0 to +18 dB at 45 Hz
• Ultra Efficient Class bD Circuitry
• Dimensions: 21-7/8"L x 8-3/16"W x 2-3/16"H

$1,599.99

AVAILABLE

Ships at Later Date

1200W RMS Class D Monoblock SK Series Car Amplifier

• RMS: 488W x 1 @ 4 ohms, 872W x 1 @ 2 ohms, 1385W x 1 @ 1 ohm
• Total RMS Power: 1385W
• Class D Circuitry
• Variable Bass Boost: 0 to +9 dB at 45 Hz
• Heavy Duty Aluminum Alloy
• Dimensions: 13-3/16"W x 7-1/2"L x 2-1/4"H

50% off a 0/1 Gauge Amp Kit with Select Amplifiers!

$339.99

IN STOCK

2400W RMS KX Series Monoblock Class D Car Power Amplifier (KX 2400.1)

• RMS: 1200W x 1 @ 4 ohms, 2400W x 1 @ 2 ohms
• Total Peak Power: 3200W
• CEA-2006 Compliant
• Kick EQ+ Bass Boost: 0-18 dB from 20-80 Hz
• Magnetic Panel Covers Controls
• Dimensions: 8-5/16"W x 15-1/2"L x 2-1/8"H

FREE $150.00 SMD DD-1 Distortion Detector!

$1,029.95

IN STOCK

Only 3 Left!

1000W Mt.Olympus Series Monoblock Class D Car Amplifier

• RMS Power: 450W x 1 @ 4 ohms, 800W x 1 @ 2 ohms, 1000W x 1 @ 1 ohm
• Total Peak Power: 2000W
• Variable Low-Pass Filter (35-250 Hz)

$239.99

IN STOCK

Only 2 Left!

8000W Max 1 Channel Monoblock D Block Series Car Amplifier

• RMS: 950W x 1 @ 4 ohms, 1500W x 1 @ 2 ohms, 2000W x 1 @ 1 ohm, 4000W x 1 @ 0.5 ohms
• Total Peak Power: 8000W
• CEA-2006 Compliant
• Bass Boost: 0-12 dB
• Class D Circuitry
• Dimensions: 19-15/16"L x 6-1/2"W x 2-1/8"H

FREE True 1/0 Gauge Amp Kit with Purchase!

$1,199.95

SPECIAL ORDER

Ships at Later Date

5000W Max Monoblock Class D Power House Series Digital Car Amplifier

• RMS: 1500W x 1 @ 4 ohms, 3000W x 1 @ 2 ohms
• Total Peak Power: 5000W
• Preamp RCA Outputs
• Bass Boost: 0-10 dB
• Class D Circuitry
• Dimensions: 15"L x 10-1/8"W x 2-3/8"H

$499.95

IN STOCK

Only 3 Left!

1600W RMS KX Series Monoblock Class D Car Power Amplifier

• RMS: 800W x 1 @ 4 ohms, 1600W x 1 @ 2 ohms
• Total Peak Power: 3200W
• CEA-2006 Compliant
• Kick EQ+ Bass Boost: 0-18 dB from 20-80 Hz
• Magnetic Panel Covers Controls
• Dimensions: 8-5/16"W x 11-3/16"L x 2-1/8"H

FREE $150.00 SMD DD-1 Distortion Detector!

$729.95

IN STOCK

Only 2 Left!

200W RMS MSK Series Monoblock Class D Compact Car Amplifier

• RMS: 87W x 1 @ 4 ohms, 150W x 1 @ 2 ohms, 218W x 1 @ 1 ohm
• Total RMS Power: 218W
• 1 Pair of Preamp Outputs
• Dimensions: 4-15/16" W x 6-5/16" L x 2-1/4" H

25% off a 8 Gauge Amp Kit with Purchase

$189.99

IN STOCK

Only 3 Left!

400W Excelon Series Monoblock Class D Car Amplifier

• RMS Power: 400W x 1 @ 4 ohms, 600W x 1 @ 2 ohms
• Variable Low-Pass Filter (50-200 Hz, 24 dB/octave)
• CEA-2006 Compliant
• Dimensions: 8-11/16"W x 1-7/16"L x 8"H

$209.99

IN STOCK

2500W RMS Class D Monoblock SK Series Car Amplifier

• RMS: 790W x 1 @ 4 ohms, 1450W x 1 @ 2 ohms, 2500W x 1 @ 1 ohm
• Total RMS Power: 2500W
• Class D Circuitry
• Variable Bass Boost: 0 to +9 dB at 45 Hz
• Strappable
• Dimensions: 9-1/2"W x 20-1/2"D x 2-9/16"H

FREE $200.00 NVX XAPK1D Amp Kit with purchase!

$759.99

IN STOCK

Only 2 Left!

4000W RMS, Monoblock Class D OptiDrive Series Car Amplifier

• RMS: 2000W x 1 @ 4 ohms, 3000W x 1 @ 2 ohms, 4000W x 1 @ 1 ohm
• Total RMS Power: 4000W
• Class D Circuitry
• Bass Boost: 0-18 dB
• 1 Pair of Preamp Outputs
• Dimensions: 23-1/3"L x 10-11/16"W x 2-1/8"H

$649.99

IN STOCK

Only 1 Left!

500W RMS MSK Series Monoblock Car Amplifier

• RMS: 246W x 1 @ 4 ohms, 402W x 1 @ 2 ohms, 541W x 1 @ 1 ohm
• Total RMS Power: 541W
• 1 Pair of Preamp Outputs
• Dimensions: 4-15/16"W x 7-7/8"L x 2-1/4"H

$224.99

IN STOCK

Only 3 Left!

750W RMS, Marine MHD Series Monoblock Amplifier

• RMS: 750 x 1 @ 4 ohms, 750W x 1 @ 2 ohms, 750W x 1 @ 1.5 ohms
• Total RMS Power: 750W
• R.I.P.S (Regulated, Intelligent Power Supply)
• Studio-Grade Signal Processing
• Marine Amplifier
• Dimensions: 10-3/4"L x 7-7/8"W x 1-15/16"H

25% Off NVX XKIT42 4 gauge amp kit with Purchase!

$649.95

IN STOCK

Only 2 Left!

500W Bomber Series Monoblock Class D Digital Amplifier

• RMS Power: 500W x 1 @ 2 ohms
• Total Peak Power: 1000W
• Ultra Compact High Density Aluminium Alloy Chassis
• Direct FET Power Mosfet Output Stage
• Dimensions: 4.02"W x 6.99"L x 1.4"H

FREE Bass Reconstruction Sound Processor w/ Amp!

$359.99

IN STOCK

Only 1 Left!

10,000W Monoblock Class D OPTI Series Car Amplifier

• RMS: 3000W x 1 @ 4 ohms, 6000W x 1 @ 2 ohms 10000W x 1 @ 1 ohm
• Total RMS Power: 10000W
• Wired Bass Remote Included
• Bass Boost: 0-16 dB
• 1 Pair of Preamp Outputs
• Dimensions: 11"W x 36-1/4"L x 2-1/8"H

FREE True 1/0 Gauge Amp Kit with Purchase!

$1,099.99

IN STOCK

Only 3 Left!

1500W RMS Single-Channel Class D Monoblock Car Amplifier

Monoblock Class D Car Amplifier • 450W x 1 Chan @ 4 Ohm • 800 x 1 Chan @ 2 Ohms • 1500 x 1 Chan @ 1 Ohm • Dual Cooling Fans • 4-Way Protection Circuitry • Chrome Flame Fan Grilles • Cobalt Blue Illumination • Variable Bass Boost

$399.99

IN STOCK

3500W RMS Class D Monoblock SK Series Car Amplifier

• RMS: 1178W x 1 @ 4 ohms, 2066W x 1 @ 2 ohms, 3519W x 1 @ 1 ohm
• Total RMS Power: 3519W
• Class D Circuitry
• Variable Bass Boost: 0 to +9 dB at 45 Hz
• Strappable
• Dimensions: 9-1/2"W x 21-1/4"D x 2-9/16"H

FREE $200.00 NVX XAPK1D Amp Kit with purchase!

$949.99

IN STOCK

750W Vega Series Monoblock Class D Car Amplifier

• RMS Power: 750W x 1 @ 1 ohms
• Total Peak Power: 1400W
• Tiffany Style Low Level RCA Inputs
• Dimensions: 1.93"W x 7.25"L x 10.47"H

$419.99

IN STOCK

Only 1 Left!

1200 RMS Monoblock Class A/B High Fidelity Q Series Car Amplifier

• RMS: 400W x 1 @ 4 ohms, 800W x 1 @ 2 ohms, 1200W x 1 @ 1 ohm
• Total RMS Power: 1200W
• Wired Bass Remote Included
• Bass Boost: 0-12 dB
• Preamp RCA Outputs
• Dimensions: 20"L x 8-1/2"W x 2-1/4"H

25% Off NVX XKIT42 4 gauge amp kit with Purchase!

$669.99

AVAILABLE

Ships at Later Date

4500W RMS Class D Monoblock SK Series Car Amplifier

• RMS: 1500W x 1 @ 4 ohms, 2780W x 1 @ 2 ohms, 4900W x 1 @ 1 ohm
• Total RMS Power: 4900W
• Class D Circuitry
• Variable Bass Boost: 0 to +9 dB at 45 Hz
• Strappable
• Dimensions: 9-1/2"W x 26"D x 2-1/2"H

FREE $200.00 NVX XAPK1D Amp Kit with purchase!

$1,429.99

IN STOCK

Only 2 Left!

600 RMS Monoblock Class A/B High Fidelity Q Series Car Amplifier

• RMS: 250W x 1 @ 4 ohms, 400W x 1 @ 2 ohms, 600W x 1 @ 1 ohm
• Total RMS Power: 1200W
• Wired Bass Remote Included
• Bass Boost: 0-12 dB
• Preamp RCA Outputs
• Dimensions: 17-3/4"L x 8-1/2"W x 2-1/4"H

$359.99

IN STOCK

Only 2 Left!

1000W Vega Series Monoblock Class D Car Amplifier

• RMS Power: 1000W x 1 @ 1 ohms
• Total Peak Power: 2000W
• Tiffany Style Low Level RCA Inputs
• Dimensions: 1.93"W x 7.25"L x 11.65"H

$349.99

IN STOCK

Only 1 Left!

5000W EVOLUTION Series Monoblock Class D Car Amplifier

• 1750W x 1 Chan. @ 4 Ohms
• 3500W x 1 Chan. @ 2 Ohms
• 5000 x 1 Chan. @ 1 Ohms
• Peak Power: 5000W
• Soft Turn-On Circuit
• Nickel-Plated Terminals
• Variable Bass EQ

$169.95

OUT OF STOCK

1500W Max Anarchy Series Monoblock Power Amplifier

• RMS: 1100W x 1 @ 4 ohms
• Peak: 1500W x 1 @ 2 ohms
• Illuminated Logo
• Bass Boost 0-18 dB
• Chrome-Plated Connections
• Dimensions: 10"L x 10"W x 2-3/16"H

25% off a 4 Gauge Amp Kit with Purchase

$64.99

IN STOCK

Only 1 Left!

4500W Max Onyx Series Class D Monoblock Power Amplifier

• RMS: 2100W x 1 @ 4 ohms
• Peak: 3500W x 1 @ 2 ohms, 4500W x 1 chan @ 1 ohm
• Class D Circuitry
• Bass Boost 0-18 dB
• Line and Speaker Level Inputs
• Dimensions: 15-1/4" L x 10" W x 2-3/16" H

50% off NVX 2-Channel RCA Cables w/ purchase!

$119.99

IN STOCK

500W V-Power Series Class D Monoblock Digital Amplifier

• RMS: 300W x 1 @ 4 ohms, 500W x 1 @ 2 ohms
• Total Peak Power: 500W
• CEA-2006 Compliant Amplifier
• 4-Channel Speaker-Level Inputs
• Heavy Duty Aluminum Alloy Heat-Sink
• Dimensions: 7-7/8"W x 7-7/8"L x 2-3/16"H

$169.99

OUT OF STOCK

1000W RMS, Rubicon Series Class D Monoblock Amplifier

Rubicon Series Monoblock Car Amplifier • 600 watts x 1 chan @ 4 Ohms • 800 watts x 1 chan @ 2 Ohms • MOSFET Power Supply • LED Protection Indicator • SMT Built In Cooling Fan • Aluminum Alloy Heatsink

$151.95

OUT OF STOCK

3000W Max Monoblock ARMOR Series Class D Car Amplifier

• RMS: 1200W x 1 @ 4 ohms
• Peak: 2200W x 1 @ 2 ohms, 3000W x 1 @ 1 ohm
• Strappable Peak: 6000W x 1 @ 2 ohms
• Bass Boost 0-12 dB
• Heavy Duty Aluminum Alloy Heatsink
• Dimensions: 12-1/3"W x 5"D x 2-8/10"H

25% off a 4 Gauge Amp Kit with Purchase

$94.99

IN STOCK

Only 2 Left!

4000W Max Monoblock ARMOR Series Class D Car Amplifier

• RMS: 1600W x 1 @ 4 ohms
• Peak: 3000W x 1 @ 2 ohms, 4000W x 1 @ 1 ohm
• Strappable Peak: 8000W x 1 @ 2 ohms
• Bass Boost 0-12 dB
• Heavy Duty Aluminum Alloy Heatsink
• Dimensions: 14-1/3"W x 5"D x 2-8/10"H

25% off a 4 Gauge Amp Kit with Purchase

$113.95

OUT OF STOCK

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Related Categories

Amplifier Wiring Kits
Get all the cables, wires, and hardware you need to install your new car audio amplifier with one of these power amp kits. Amplifier wiring kits come with your basic power and ground cables, as well as other necessary wires. Select complete amplifier kits will include speaker wire, RCA interconnect cables, and more! To make sure you get the kit that is best designed for your car audio system, scroll down to the bottom of this page for the buying guide.
Capacitors
Car audio capacitors are a great addition to any aftermarket audio system that is in need of a little extra power. Capacitors store a temporary electrical charge that can be released during periods of extra power strain. If a vehicle has dimming headlights when music is played, a capacitor could solve that problem.
Sound Processors
For those who want the most out their car audio system, a quality sound processor is a must. After some slight adjustments, your systems will sound like it has been professionally tuned and optimized. Tune your system to perfection with these crossovers, equalizers, and bass drivers.