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2008 Mazda RX-8

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Use our shopping filters to find the right 2/3/4-channel amp to power upgraded speakers properly.

Overview Upgrade your Stereo Upgrade your Speakers Add a Subwoofer Add an Amplifier Digital Sound Processors Audio Installation & Accessories Add a Backup Camera Dads & Grads Sale

Amps for Adding Speakers for 2008 Mazda RX-8

Some vehicles require an amp bypass module, a line-output converter like the NVX XLCA2 or AudioControl LC2i, or a DSP to integrate with your factory radio and avoid bass roll-off. Bass roll-off occurs when a factory radio's crossover is designed only for the original equipment speakers, resulting in a not complete signal being sent to your new aftermarket amp.

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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.
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.
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.
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.
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.

Speaker Level Inputs
Speaker level inputs are commonly referred to as high-level inputs and vice versa. This input type allows you to get your audio signal directly from the speaker wire in your vehicle, instead of using RCA cables. The advantage of this is factory integration, as most stock radios do not have RCA outputs to run amplifiers.
Maximum Input Gauge Size
This is the largest gauge wire that will fit into the power and ground terminals of this device. The lower the gauge number, the thicker the wire is. For example, a 4 gauge wire is thicker than an 8 gauge wire and thus has higher current carrying capacity. Always do your best to get this size wire to reduce the risk of damage to your components.
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JBL Club A754 with NVX 8 Gauge Amp Kit

400W RMS Club Series Class-H Compact 4-Channel Amplifier

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JBL Club A754 with NVX 8 Gauge Amp Kit

400W RMS Club Series Class-H Compact 4-Channel Amplifier

• 75 watts x 4 channel @ 4 ohm
• 100 watts x 4 channel @ 2 ohm
• Bridged: 200 watts x 2 channel @ 4 ohm
• Total RMS Power: 400 watts
• Class H 2 ohm Stable 4-Channel Amplifier
• Includes Amplifier Wiring Kit

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• 75 watts x 4 channel @ 4 ohm
• 100 watts x 4 channel @ 2 ohm
• Bridged: 200 watts x 2 channel @ 4 ohm
• Total RMS Power: 400 watts
• Class H 2 ohm Stable 4-Channel Amplifier
• Includes Amplifier Wiring Kit

Kenwood eXcelon XM302-4 with NVX 4 Gauge Amp Kit

300W RMS XR Series Class-D 4-Channel Marine Amplifier

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Kenwood eXcelon XM302-4 with NVX 4 Gauge Amp Kit

300W RMS XR Series Class-D 4-Channel Marine Amplifier

• 50 watts x 4 channel @ 4 ohm
• 75 watts x 4 channel @ 2 ohm
• Bridged: 150 watts x 2 channel @ 4 ohm
• Total RMS Power: 300 watts
• Class D 2 ohm Stable 4-Channel Amplifier
• Includes Amplifier Wiring Kit

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• 50 watts x 4 channel @ 4 ohm
• 75 watts x 4 channel @ 2 ohm
• Bridged: 150 watts x 2 channel @ 4 ohm
• Total RMS Power: 300 watts
• Class D 2 ohm Stable 4-Channel Amplifier
• Includes Amplifier Wiring Kit

MTX Audio MUD100.4with NVX 8 Gauge Amp Kit

400W Peak (200W RMS) Mud Series Class-D 4-Channel Compact Marine Amplifier for Outdoor Powersports

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MTX Audio MUD100.4with NVX 8 Gauge Amp Kit

400W Peak (200W RMS) Mud Series Class-D 4-Channel Compact Marine Amplifier for Outdoor Powersports

• 50 Watts RMS x 4 @ 4 ohm
• 100 Watts RMS x 4 @ 2 ohm
• Total Peak Power: 800 Watts
• Selectable Front high-pass filter: 80 / 200 Hz
• Speaker-level (high-level) inputs
• Includes Amplifier Wiring Kit

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• 50 Watts RMS x 4 @ 4 ohm
• 100 Watts RMS x 4 @ 2 ohm
• Total Peak Power: 800 Watts
• Selectable Front high-pass filter: 80 / 200 Hz
• Speaker-level (high-level) inputs
• Includes Amplifier Wiring Kit

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Rockford Fosgate PBR400X4D with NVX 8 Gauge Amp Kit

400W RMS Punch Series Class-D 4-Channel Amplifier

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Rockford Fosgate PBR400X4D with NVX 8 Gauge Amp Kit

400W RMS Punch Series Class-D 4-Channel Amplifier

• 50 watts x 4 channel @ 4 ohm
• 100 watts x 4 channel @ 2 ohm
• Bridged: 200 watts x 2 channel @ 4 ohm
• Total RMS Power: 400 watts
• Class D 2 ohm Stable 4-Channel Amplifier
• Includes Amplifier Wiring Kit

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• 50 watts x 4 channel @ 4 ohm
• 100 watts x 4 channel @ 2 ohm
• Bridged: 200 watts x 2 channel @ 4 ohm
• Total RMS Power: 400 watts
• Class D 2 ohm Stable 4-Channel Amplifier
• Includes Amplifier Wiring Kit

Sound Extreme by ECOXGEAR SEI-AMPEV30041 with NVX 8 Gauge Amp Kit

300W RMS EV Series Class-D 4-Channel Amplifier

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Sound Extreme by ECOXGEAR SEI-AMPEV30041 with NVX 8 Gauge Amp Kit

300W RMS EV Series Class-D 4-Channel Amplifier

• 74 watts x 4 channel @ 4 ohm
• Bridged: 150 watts x 2 channel @ 2 ohm
• Total RMS Power: 300 watts
• Class D 4 ohm Stable 4-Channel-Channel Amplifier
• Includes Amplifier Wiring Kit

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• 74 watts x 4 channel @ 4 ohm
• Bridged: 150 watts x 2 channel @ 2 ohm
• Total RMS Power: 300 watts
• Class D 4 ohm Stable 4-Channel-Channel Amplifier
• Includes Amplifier Wiring Kit

Sound Extreme by ECOXGEAR SEI-AMP30041 with NVX 8 Gauge Amp Kit

300W RMS Class-D 4-Channel High Definition Marine Amplifier

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Sound Extreme by ECOXGEAR SEI-AMP30041 with NVX 8 Gauge Amp Kit

300W RMS Class-D 4-Channel High Definition Marine Amplifier

• 75 watts x 4 channel @ 4 ohm
• Bridged: 150 watts x 2 channel @ 2 ohm
• Total RMS Power: 300 watts
• Class D 4 ohm Stable 4-Channel Amplifier
• Includes Amplifier Wiring Kit

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• 75 watts x 4 channel @ 4 ohm
• Bridged: 150 watts x 2 channel @ 2 ohm
• Total RMS Power: 300 watts
• Class D 4 ohm Stable 4-Channel Amplifier
• Includes Amplifier Wiring Kit

Wet Sounds SDX4 with NVX 4 Gauge Amp Kit

1370 Watt Sinister Series Full Range 4-Channel Class D Amplifier (WetSounds)

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Wet Sounds SDX4 with NVX 4 Gauge Amp Kit

1370 Watt Sinister Series Full Range 4-Channel Class D Amplifier (WetSounds)

• RMS: 185W x 4 @ 4 ohm, 340W x 4 @ 2 ohm, Bridged: 685W x 2 @ 4 ohm
• Total RMS Power: 1370 watts
• Wet Sounds unique transformer
• Advanced Intelligent Microprocessor Control
• Top mounted crossover controls
• Dimensions: 9.82" W x 13.50" L x 2.70" H
• Includes Amplifier Wiring Kit

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• RMS: 185W x 4 @ 4 ohm, 340W x 4 @ 2 ohm, Bridged: 685W x 2 @ 4 ohm
• Total RMS Power: 1370 watts
• Wet Sounds unique transformer
• Advanced Intelligent Microprocessor Control
• Top mounted crossover controls
• Dimensions: 9.82" W x 13.50" L x 2.70" H
• Includes Amplifier Wiring Kit

Cerwin Vega SRPM1100.5D with NVX 8 Gauge Amp Kit

980W RMS Stroker RPM Series Class-D 5-Channel Marine Amplifier with Bass Remote

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Cerwin Vega SRPM1100.5D with NVX 8 Gauge Amp Kit

980W RMS Stroker RPM Series Class-D 5-Channel Marine Amplifier with Bass Remote

• 100 watts x 4 channel + 300 watts x 1 channel @ 4 ohm
• 120 watts x 4 channel + 500 watts x 1 channel @ 2 ohm
• Bridged: 200 watts x 2 channel @ 4 ohm + 500 watts x 1 channel @ 2 ohm
• Total RMS Power: 980 watts
• Class D 2 ohm Stable 5-Channel Amplifier
• Includes Amplifier Wiring Kit

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• 100 watts x 4 channel + 300 watts x 1 channel @ 4 ohm
• 120 watts x 4 channel + 500 watts x 1 channel @ 2 ohm
• Bridged: 200 watts x 2 channel @ 4 ohm + 500 watts x 1 channel @ 2 ohm
• Total RMS Power: 980 watts
• Class D 2 ohm Stable 5-Channel Amplifier
• Includes Amplifier Wiring Kit

Diamond Audio DES400.2D with NVX 8 Gauge Amp Kit

500W RMS DES Series Class-D 2-Channel Amplifier

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Diamond Audio DES400.2D with NVX 8 Gauge Amp Kit

500W RMS DES Series Class-D 2-Channel Amplifier

• 200 watts x 2 channel @ 4 ohm
• 250 watts x 2 channel @ 2 ohm
• Bridged: 500 watts x 1 channel @ 4 ohm
• Total RMS Power: 500 watts
• Class D 2 ohm Stable 2-Channel-Channel Amplifier
• Includes Amplifier Wiring Kit

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• 200 watts x 2 channel @ 4 ohm
• 250 watts x 2 channel @ 2 ohm
• Bridged: 500 watts x 1 channel @ 4 ohm
• Total RMS Power: 500 watts
• Class D 2 ohm Stable 2-Channel-Channel Amplifier
• Includes Amplifier Wiring Kit

MB Quart RA1-710.5 with NVX 4 Gauge Amp Kit

350W RMS 5-Channel Reference Series Full Range Class D Car Amplifier

RA17105_XKIT46 big Out of stock
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MB Quart RA1-710.5 with NVX 4 Gauge Amp Kit

350W RMS 5-Channel Reference Series Full Range Class D Car Amplifier

• 50 watts x 4 channel + 150 watts x 1 channel @ 4 ohm
• 100 watts x 4 channel + 250 watts x 1 channel @ 2 ohm
• Bridged:100 watts x 4 channel @ 4 ohm + 250 watts x 1 channel @ 2 ohm
• Total RMS Power: 350 watts
• Class D 1-Ohm Stable 5-Channel Amplifier
• Includes Amplifier Wiring Kit

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• 50 watts x 4 channel + 150 watts x 1 channel @ 4 ohm
• 100 watts x 4 channel + 250 watts x 1 channel @ 2 ohm
• Bridged:100 watts x 4 channel @ 4 ohm + 250 watts x 1 channel @ 2 ohm
• Total RMS Power: 350 watts
• Class D 1-Ohm Stable 5-Channel Amplifier
• Includes Amplifier Wiring Kit

Audio Control ACX-300.4 + NVX XKIT84 8 Gauge Amp Wiring Kit

300 Watt Marine 4-Channel Amplifier + NVX Premium Wiring Kit

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Audio Control ACX-300.4 + NVX XKIT84 8 Gauge Amp Wiring Kit

300 Watt Marine 4-Channel Amplifier + NVX Premium Wiring Kit

• 300 Watts @ 2 Ohm
• 175 Watts @ 4 Ohm
• 4/3/2 Channel Amplifier

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• 300 Watts @ 2 Ohm
• 175 Watts @ 4 Ohm
• 4/3/2 Channel Amplifier

AudioControl ACX-300.4 with Belva 8 Gauge Amp Kit

300 Watt Marine 4-Channel Amplifier

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AudioControl ACX-300.4 with Belva 8 Gauge Amp Kit

300 Watt Marine 4-Channel Amplifier

• 300 Watts @ 2 Ohm
• 175 Watts @ 4 Ohm
• 4/3/2 Channel Amplifier
• Includes Amplifier Wiring Kit

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• 300 Watts @ 2 Ohm
• 175 Watts @ 4 Ohm
• 4/3/2 Channel Amplifier
• Includes Amplifier Wiring Kit

Earthquake MiNi D1000.4 with Belva 8 Gauge Amp Kit

1000W Class D 4-Channel Mini Series Amplifier

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Earthquake MiNi D1000.4 with Belva 8 Gauge Amp Kit

1000W Class D 4-Channel Mini Series Amplifier

• RMS Power: 65W x 4 @ 4 ohm, 90W x 4 @ 2 ohm, Bridged, 190 watts x 2 @ 4 ohm
• Total Peak Power: 1000W
• Variable Bass Boost
• Optical Control Circuitry
• Crossover Frequencies: 40-400Hz
• Includes Amplifier Wiring Kit

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-19% $249.00
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• RMS Power: 65W x 4 @ 4 ohm, 90W x 4 @ 2 ohm, Bridged, 190 watts x 2 @ 4 ohm
• Total Peak Power: 1000W
• Variable Bass Boost
• Optical Control Circuitry
• Crossover Frequencies: 40-400Hz
• Includes Amplifier Wiring Kit

MB Quart NA3-600.6 with NVX 8 Gauge Amp Kit

Nautic Marine 600 Watt 6 Channel Marine Amplifier

NA36006_XKIT86 big
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MB Quart NA3-600.6 with NVX 8 Gauge Amp Kit

Nautic Marine 600 Watt 6 Channel Marine Amplifier

• 50 Watts Peak x 6
• 100 Watts Peak x 6 @ 2 ohm
• Total Peak Power: 600 Watts
• CEA-2006 Compliant
• NMMA Certified
• Audiophile Marine Standard
• LED system protection circuit diagnostics
• Class SQ
• Includes Amplifier Wiring Kit

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• 50 Watts Peak x 6
• 100 Watts Peak x 6 @ 2 ohm
• Total Peak Power: 600 Watts
• CEA-2006 Compliant
• NMMA Certified
• Audiophile Marine Standard
• LED system protection circuit diagnostics
• Class SQ
• Includes Amplifier Wiring Kit

Cerwin Vega S9500.2D with NVX 8 Gauge Amp Kit

500W RMS Stroker Series Class-D 2-Channel Amplifier with Bass Remote

S95002D_XKIT42 big
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Cerwin Vega S9500.2D with NVX 8 Gauge Amp Kit

500W RMS Stroker Series Class-D 2-Channel Amplifier with Bass Remote

• 200 watts x 2 channel @ 4 ohm
• 250 watts x 2 channel @ 2 ohm
• Bridged: 500 watts x 2 channel @ 4 ohm
• Total RMS Power: 500 watts
• Class D 2 ohm Stable 2-Channel Amplifier
• Includes Amplifier Wiring Kit

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• 200 watts x 2 channel @ 4 ohm
• 250 watts x 2 channel @ 2 ohm
• Bridged: 500 watts x 2 channel @ 4 ohm
• Total RMS Power: 500 watts
• Class D 2 ohm Stable 2-Channel Amplifier
• Includes Amplifier Wiring Kit

Cerwin Vega S9500.2D + Free Belva Amp Kit

Stroker Series 500W RMS 2-Channel Amplifier

S9500.2D, BAK42 big
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Cerwin Vega S9500.2D + Free Belva Amp Kit

Stroker Series 500W RMS 2-Channel Amplifier

• 4/2/1 ohm: 250 watts x 2 chan.
• Bridged, 4/2 ohm: 700 x 1 chan.
• Class-D 2-channel 4-Ohm Amplifier
• Frequency Response: 10Hz ~ 35KHz
• Crossover 35Hz – 350Hz

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• 4/2/1 ohm: 250 watts x 2 chan.
• Bridged, 4/2 ohm: 700 x 1 chan.
• Class-D 2-channel 4-Ohm Amplifier
• Frequency Response: 10Hz ~ 35KHz
• Crossover 35Hz – 350Hz

Rockford Fosgate PM400X4 with Amplifier Wiring Kit

400W 4-Channel Punch Series Class AB Marine Amplifier

PM400X4, XKIT44 big
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Rockford Fosgate PM400X4 with Amplifier Wiring Kit

400W 4-Channel Punch Series Class AB Marine Amplifier

• RMS: 50 watts x 4 chan. @ 4 ohm, 100 watts x 4 chan. @ 2 ohm, Bridged 200 watts x 2 chan. @ 4 ohm
• CEA-2006 Compliant
• Features C.L.E.A.N. Set-up
• Protected against Dust, UV, & Corrosion
• Marine grade two part epoxy coating on circuit boards

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• RMS: 50 watts x 4 chan. @ 4 ohm, 100 watts x 4 chan. @ 2 ohm, Bridged 200 watts x 2 chan. @ 4 ohm
• CEA-2006 Compliant
• Features C.L.E.A.N. Set-up
• Protected against Dust, UV, & Corrosion
• Marine grade two part epoxy coating on circuit boards

Kicker 46CXA660.5 with Amp Kit and 3 Year Warranty

360W RMS CX-Series Class-D 5-Channel Amplifier with 4 Gauge Amp Kit

CXA660.5, 46CK4, 46KI46 big
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Kicker 46CXA660.5 with Amp Kit and 3 Year Warranty

360W RMS CX-Series Class-D 5-Channel Amplifier with 4 Gauge Amp Kit

• 65 Watts RMS x 4 @ 4 ohm
• 90 Watts RMS x 4 @ 2 ohm
• 180 Watts RMS x 2 @ 4 ohm (bridged)
• 150 Watts RMS x 1 @ 4 ohm (sub channel)
• 300 Watts RMS x 1 @ 4 ohm (sub channel)
• Class A/B Full-Range Channel Amplifier w/Class-D Bass Channel
• KickEQ™ 6dB variable bass boost for those additional low frequencies
• FIT+™ (Fail-safe Integration Technology-PLUS) means it works with nearly every radio
• Amplifier wiring kit included

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• 65 Watts RMS x 4 @ 4 ohm
• 90 Watts RMS x 4 @ 2 ohm
• 180 Watts RMS x 2 @ 4 ohm (bridged)
• 150 Watts RMS x 1 @ 4 ohm (sub channel)
• 300 Watts RMS x 1 @ 4 ohm (sub channel)
• Class A/B Full-Range Channel Amplifier w/Class-D Bass Channel
• KickEQ™ 6dB variable bass boost for those additional low frequencies
• FIT+™ (Fail-safe Integration Technology-PLUS) means it works with nearly every radio
• Amplifier wiring kit included

Infinity Kappa Perfect 5004A with NVX 8 Gauge Amp Kit

500W RMS Kappa Perfect Series Class-D 4-Channel Powersports Amplifier

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Infinity Kappa Perfect 5004A with NVX 8 Gauge Amp Kit

500W RMS Kappa Perfect Series Class-D 4-Channel Powersports Amplifier

• 75 watts x 4 channel @ 4 ohm
• 125 watts x 4 channel @ 2 ohm
• Bridged: 250 watts x 2 channel @ 4 ohm
• Total RMS Power: 500 watts
• Class D 2 ohm Stable 4-Channel Amplifier
• Includes Amplifier Wiring Kit

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• 75 watts x 4 channel @ 4 ohm
• 125 watts x 4 channel @ 2 ohm
• Bridged: 250 watts x 2 channel @ 4 ohm
• Total RMS Power: 500 watts
• Class D 2 ohm Stable 4-Channel Amplifier
• Includes Amplifier Wiring Kit

MB Quart FA2-400.4 with Amplifier Wiring Kit

400W RMS Formula Series Class-D 4-Channel Car Amplifier

FA2-400.4, BAK44 big
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MB Quart FA2-400.4 with Amplifier Wiring Kit

400W RMS Formula Series Class-D 4-Channel Car Amplifier

• 50 watts x 4 channel @ 4 ohm
• 100 watts x 4 channel @ 2 ohm
• Bridged: @ 4 ohm
• Total RMS Power: 400 watts
• Class D 4 ohm Stable 4-Channel-Channel Amplifier
• Includes Amplifier Wiring Kit

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• 50 watts x 4 channel @ 4 ohm
• 100 watts x 4 channel @ 2 ohm
• Bridged: @ 4 ohm
• Total RMS Power: 400 watts
• Class D 4 ohm Stable 4-Channel-Channel Amplifier
• Includes Amplifier Wiring Kit

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    FAQ for Multi-channel Amplifiers for Adding Speakers in 2008 RX-8

    Q: Can I upgrade or change the Multi-channel Amplifiers for Adding Speakers in 2008 Mazda RX-8?

    A: Yes this page includes all the best Multi-channel Amplifiers for Adding Speakers that work in your RX-8.

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