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2003 Kia Optima

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Universal gear includes car amplifiers, subs, and other products that do not install in a specific location or require fitment to integrate with a vehicle.

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

Universal-Fit Audio for 2003 Kia Optima

When thinking of universal gear, we consider products like a car amp that gives more power to your speakers or subs, cell phone chargers, equalizers and sound processors, rear-seat entertainment and video monitors, as well as dash cameras.

Better sound with your factory radio

Better sound with a factory radio

Love your factory look or can't replace the stereo? We got you covered.

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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.
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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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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.
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Cerwin Vega B54

1200W Peak (600W RMS) Class D Stealth Bomber Series 4 Channel Car Amplifier

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Cerwin Vega B54

1200W Peak (600W RMS) Class D Stealth Bomber Series 4 Channel Car Amplifier

• 80 watts x 4 channel @ 4 ohm
• 150 watts x 4 channel @ 2 ohm
• Bridged: 300 watts x 2 channel @ 4 ohm
• Total RMS Power: 600 watts
• Class D 2 ohm Stable 4-Channel Amplifier

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Deaf Bonce Machete MLA-1500

1480W RMS Class D Machete Series Monoblock Car Amplifier

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Deaf Bonce Machete MLA-1500

1480W RMS Class D Machete Series Monoblock Car Amplifier

• 540 watts x 1 channel @ 4 ohm
• 920 watts x 1 channel @ 2 ohm
• 1480 watts x 1 channel @ 1 ohm
• Total RMS Power: 1480 watts
• Class D 1 ohm Stable Monoblock Amplifier

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NVX XAPK4 + XIV25 (XKIT42 Sub)

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NVX - Worth the Envy - Direct to Consumer Car Audio

NVX XCA6K

6000W RMS Class D XC-Series Monoblock Korean Competition Amplifier with Bass Remote

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NVX XCA6K

6000W RMS Class D XC-Series Monoblock Korean Competition Amplifier with Bass Remote

• 2000 watts x 1 channel @ 4 ohm
• 4000 watts x 1 channel @ 2 ohm
• 6000 watts x 1 channel @ 1 ohm
• Total RMS Power: 6000 watts
• Class D 1 ohm Stable Monoblock Amplifier

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Rockford Fosgate Power Marine TM400X4ad

400W Class AD Power Series 4 Channel Marine Amplifier

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Rockford Fosgate Power Marine TM400X4ad

400W Class AD Power Series 4 Channel Marine Amplifier

• 100 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 AD 2 ohm Stable 4-Channel Amplifier

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• 100 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 AD 2 ohm Stable 4-Channel Amplifier

Kenwood eXcelon X503-1

1000W Peak (500W RMS) Class D eXcelon Series Monoblock Car Amplifier with Bass Remote

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Kenwood eXcelon X503-1

1000W Peak (500W RMS) Class D eXcelon Series Monoblock Car Amplifier with Bass Remote

• 300 watts x 1 channel @ 4 ohm
• 500 watts x 1 channel @ 2 ohm
• Total RMS Power: 500 watts
• Class D 2 ohm Stable Monoblock Amplifier

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List price $400.00
-25% $299.00

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DS18 X4

1320W Peak (560W RMS) Class D X-Series 4 Channel Full Range Car Amplifier

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DS18 X4

1320W Peak (560W RMS) Class D X-Series 4 Channel Full Range Car Amplifier

• 70 watts x 4 channel @ 4 ohm
• 140 watts x 4 channel @ 2 ohm
• Bridged: 220 watts x 2 channel @ 4 ohm
• Total RMS Power: 560 watts
• Class D 2 ohm Stable 4-Channel Amplifier

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• 70 watts x 4 channel @ 4 ohm
• 140 watts x 4 channel @ 2 ohm
• Bridged: 220 watts x 2 channel @ 4 ohm
• Total RMS Power: 560 watts
• Class D 2 ohm Stable 4-Channel Amplifier

Limited time!

Sundown Audio SALT-8 Competition

8000W RMS Class D SALT Series Competition Monoblock Car Amplifier with Bass Remote (A-SALT8)

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Sundown Audio SALT-8 Competition

8000W RMS Class D SALT Series Competition Monoblock Car Amplifier with Bass Remote (A-SALT8)

• 2000 watts x 1 channel @ 4 ohm
• 4000 watts x 1 channel @ 2 ohm
• 8000 watts x 1 channel @ 1 ohm
• 16000 watts x 1 channel @ 2 ohm Bridged
• Total RMS Power: 8000 watts
• Class D 1 ohm Stable Monoblock Amplifier

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List price $2879.99
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NVX XKIT02

NVX XKIT02

$179.99

$125.99

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JBL STAGE GT 80021 (STAGEGT80021AM)

800W Peak (260W RMS) Class D Stage GT Series 2-Channel Car Amplifier

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JBL STAGE GT 80021 (STAGEGT80021AM)

800W Peak (260W RMS) Class D Stage GT Series 2-Channel Car Amplifier

• 80 watts x 2 channel @ 4 ohm
• 130 watts x 2 channel @ 2 ohm
• Bridged: 260 watts x 1 channel @ 4 ohm
• Total RMS Power: 260 watts
• Class D 2 ohm Stable 2-Channel Amplifier

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List price $249.95
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-36% $159.95

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• 80 watts x 2 channel @ 4 ohm
• 130 watts x 2 channel @ 2 ohm
• Bridged: 260 watts x 1 channel @ 4 ohm
• Total RMS Power: 260 watts
• Class D 2 ohm Stable 2-Channel Amplifier

Deaf Bonce MFA 4.80

480W RMS Class D Machete Series 4 Channel Car Amplifier

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Deaf Bonce MFA 4.80

480W RMS Class D Machete Series 4 Channel Car Amplifier

• 80 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

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$189.90

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• 80 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

AudioControl EPIC750

750W RMS Class D Epic Series Monoblock Car Amplifier with Bass Remote

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AudioControl EPIC750

750W RMS Class D Epic Series Monoblock Car Amplifier with Bass Remote

• 300 watts x 1 channel @ 4 ohm
• 500 watts x 1 channel @ 2 ohm
• 750 watts x 1 channel @ 1 ohm
• Bridged (Strapped): 1500 watts x 1 channel @ 2 ohm
• Total RMS Power: 750 watts
• Class D 1 ohm Stable Monoblock Amplifier

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$189.00

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Save 30% on an NVX XKIT42 Amp Kit with Purchase! Add a qualifying amplifier to your cart and save 30% on the NVX XKIT42 Amp Kit! No code needed — discount applies automatically at checkout.
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• 300 watts x 1 channel @ 4 ohm
• 500 watts x 1 channel @ 2 ohm
• 750 watts x 1 channel @ 1 ohm
• Bridged (Strapped): 1500 watts x 1 channel @ 2 ohm
• Total RMS Power: 750 watts
• Class D 1 ohm Stable Monoblock Amplifier

Hifonics BG-1000.2

1000W RMS Class D Brutus BG Series 2-Channel Car Amplifier

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Hifonics BG-1000.2

1000W RMS Class D Brutus BG Series 2-Channel Car Amplifier

• 300 watts x 2 channel @ 4 ohm
• 575 watts x 2 channel @ 2 ohm
• Bridged: 1000 watts x 1 channel @ 4 ohm
• Total RMS Power: 1000 watts
• Class D 2 ohm Stable 2-Channel Amplifier

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List price $259.99
-19% $209.99

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• 300 watts x 2 channel @ 4 ohm
• 575 watts x 2 channel @ 2 ohm
• Bridged: 1000 watts x 1 channel @ 4 ohm
• Total RMS Power: 1000 watts
• Class D 2 ohm Stable 2-Channel Amplifier

Limited time!

Hifonics BG-560.2

560W RMS Class D Brutus BG Series 2-Channel Car Amplifier

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Hifonics BG-560.2

560W RMS Class D Brutus BG Series 2-Channel Car Amplifier

• 150 watts x 2 channel @ 4 ohm
• 275 watts x 2 channel @ 2 ohm
• Bridged: 560 watts x 1 channel @ 4 ohm
• Total RMS Power: 560 watts
• Class D 2 ohm Stable 2-Channel Amplifier

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List price $179.99
-11% $159.99

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NVX XAPK4 + XIV25 (XKIT42 Sub)

NVX XAPK4 + XIV25 (XKIT42 Sub)

$109.99

$76.99

$33 Savings!

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• 150 watts x 2 channel @ 4 ohm
• 275 watts x 2 channel @ 2 ohm
• Bridged: 560 watts x 1 channel @ 4 ohm
• Total RMS Power: 560 watts
• Class D 2 ohm Stable 2-Channel Amplifier

JL Audio XDM300/1

300W RMS Class D XDM Series Monoblock Car and Marine Amplifier

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JL Audio XDM300/1

300W RMS Class D XDM Series Monoblock Car and Marine Amplifier

• 200 watts x 1 channel @ 4 ohm
• 300 watts x 1 channel @ 2 ohm
• Total RMS Power: 300 watts
• Class D 2 ohm Stable Monoblock Amplifier

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Sundown Audio SAEv4-1000.1D

1000W RMS Class D SAE Series Monoblock Car Amplifier with Bass Remote (SAEv.4-1000D)

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Sundown Audio SAEv4-1000.1D

1000W RMS Class D SAE Series Monoblock Car Amplifier with Bass Remote (SAEv.4-1000D)

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

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JBL Club A758 (AMPCBA758)

1000W RMS Class D Club Series 8-Channel Car Amplifier

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JBL Club A758 (AMPCBA758)

1000W RMS Class D Club Series 8-Channel Car Amplifier

• 75 watts x 8 channel @ 4 ohm
• 125 watts x 8 channel @ 2 ohm
• Bridged: 250 watts x 4 channel @ 4 ohm
• Total RMS Power: 1000 watts
• Class D 2 ohm Stable 8-Channel-Channel Amplifier

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List price $749.95
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-25% $559.95

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• 75 watts x 8 channel @ 4 ohm
• 125 watts x 8 channel @ 2 ohm
• Bridged: 250 watts x 4 channel @ 4 ohm
• Total RMS Power: 1000 watts
• Class D 2 ohm Stable 8-Channel-Channel Amplifier

Limited time!

JVC KS-DR2104DBT

600W Peak (200W RMS) Class D DRVN Series 4-Channel Marine and Powersports Amplifier with Bluetooth Remote

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JVC KS-DR2104DBT

600W Peak (200W RMS) Class D DRVN Series 4-Channel Marine and Powersports Amplifier with Bluetooth Remote

• 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

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-9% $399.00

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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

NVX VADM5 v2 (VADM5v2)

1500W Peak (750W RMS) Class D V-Series 5-Channel Car/Marine/Powersports Amplifier with Bass Remote

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NVX VADM5 v2 (VADM5v2)

1500W Peak (750W RMS) Class D V-Series 5-Channel Car/Marine/Powersports Amplifier with Bass Remote

• 65 watts x 4 channel + 230 watts x 1 channel @ 4 ohm
• 100 watts x 4 channel + 350 watts x 1 channel @ 2 ohm
• Bridged: 200 watts x 2 channel @ 4 ohm + 350 watts x 1 channel @ 2 ohm
• Total RMS Power: 750 watts
• Class D 2 ohm Stable 5-Channel Amplifier

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2026-07-27 11:08:20

Kicker WXA1000.4 (49WXA10004)

2000W Class D Warhorse Series 4-Channel Full Range Car Amplifier with Diagnostic Tools

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Kicker WXA1000.4 (49WXA10004)

2000W Class D Warhorse Series 4-Channel Full Range Car Amplifier with Diagnostic Tools

• 250 watts x 4 channel @ 4 ohm
• 450 watts x 4 channel @ 2 ohm
• Bridged: 900 watts x 2 channel @ 4 ohm
• Total Peak Power: 2000 watts
• Class D 2 ohm Stable 4-Channel Amplifier

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DS18 SMD-3000.1D

3000W RMS Class D SMD Series Monoblock Car Amplifier with Bass Remote, VM-1 Voltmeter, and Digital LED Lights

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DS18 SMD-3000.1D

3000W RMS Class D SMD Series Monoblock Car Amplifier with Bass Remote, VM-1 Voltmeter, and Digital LED Lights

• 1300 watts x 1 channel @ 4 ohm
• 2200 watts x 1 channel @ 2 ohm
• 3000 watts x 1 channel @ 1 ohm
• Total RMS Power: 3000 watts
• Class D 1 ohm Stable Monoblock Amplifier

Save 30% off an NVX XKIT02 Amp Kit at Checkout!
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NVX XKIT02

NVX XKIT02

$179.99

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Hifonics BG-520.4

520W RMS Class D Brutus BG Series 4-Channel Car Amplifier

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Hifonics BG-520.4

520W RMS Class D Brutus BG Series 4-Channel Car Amplifier

• 75 watts x 4 channel @ 4 ohm
• 125 watts x 4 channel @ 2 ohm
• Bridged: 260 watts x 2 channel @ 4 ohm
• Total RMS Power: 520 watts
• Class D 2 ohm Stable 4-Channel Amplifier

2+ offers available
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List price $189.99
-11% $169.99

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• 75 watts x 4 channel @ 4 ohm
• 125 watts x 4 channel @ 2 ohm
• Bridged: 260 watts x 2 channel @ 4 ohm
• Total RMS Power: 520 watts
• Class D 2 ohm Stable 4-Channel Amplifier

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