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Speaker Size
Refers to the size of the speaker measured in inches. Every vehicle has standard application sizes. Please use our vehicle fitment guide for your vehicle's specific speaker sizes if you do not know them.
Design
The number of individual drivers in a car speaker. Speakers with 2 drivers are known as a 2-way, and 3 drivers are known as a 3-way. Component systems are often referred to as "separates" because the tweeter is not attached to the midwoofer (main speaker driver) and mounts separately in a location such as a door post. Component systems typically come with an external crossover so you can easily adjust the high and low frequencies sent to both the midwoofer and the tweeter. Center channel speakers are great for those looking to have surround sound in their vehicle.
RMS Power Handling
The RMS power is the amount of power the speaker requires to operate safely and properly. RMS Power Handling refers to the amount of power a speaker can handle on a continuous basis. We recommend powering your speakers or subwoofer with 80%-120% of its recommended RMS rating. The RMS power handling specification is typically rated per speaker unless otherwise noted.
Peak Power Handling
Peak power handling refers to the amount of power a speaker can handle during a brief musical burst. The RMS power range figure is a much more reliable rating for determining the speaker's power requirements. The Peak power handling specification is typically rated per speaker unless otherwise noted.
Sensitivity
An efficiency or sensitivity rating tells you how effectively a speaker converts power into sound. The higher the number, the more efficient the speaker and the louder it will play with the same input power. An efficient speaker helps you maximize your available power. Most sensitivity ratings measure the speaker's output with 1 watt of input, 1 meter from the speaker. Some speakers' sensitivity is measured with 2.83 volts of input, instead of 1 watt.
  Efficiency (1w/1m) is not an accurate indicator of a subwoofer's output capability and should not be used as a comparison to other speakers or subwoofers to determine which one is "louder".
Impedance (Per Voice Coil)
The load value (in ohms) that the speakers present to the amplifier per voice coil - the amount of resistance to the current flow. This is a key specification as subs wired in parallel or low impedances can create problems with your amplifier and potentially void all warranties. We encourage you to ask our support department prior to purchase if you do not understand which impedance level will suit your application best.
Shallow Mount Installation
This means that the subwoofer/speaker is designed to be installed in areas that do not have a lot of space. Shallow mount subwoofers are typically found under a seat or behind the seat in some trucks.

Shallow mount speakers will typically have a mounting depth of 2" or less, while shallow mount subwoofers will typically have a mounting depth of 3" or less.
Tweeter Design
Designs such as cone, dome, semi-dome, balanced dome, and whizzer are most popular. Cone tweeters are simple, efficient and typically are the most reasonably priced. Dome tweeters are used in most home speakers, and provide a smoother and more accurate sound. Semi-dome design is one with a dome placed inside a cone. A Balanced dome driver is a semi-dome with equal reproduction area given the cone and dome portions of the driver. A whizzer tweeter is a separate tweeter cone driven by the voice coil of the woofer.
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.
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DS18 CF-6MD (Open Box, Great)

1000W Peak (500W RMS) 6.5" NXL Series 2 Way Coaxial Pro Audio 4-ohm Marine Speakers (Carbon Fiber)

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DS18 CF-6MD (Open Box, Great)

1000W Peak (500W RMS) 6.5" NXL Series 2 Way Coaxial Pro Audio 4-ohm Marine Speakers (Carbon Fiber)

• 500 watts Peak Each, 250 watts RMS Each
• 1" CNC Aluminum Horn tweeters
• Water-Resistant Paper cone material
• Impedance: 4 ohm
• Sensitivity: 108 dB
• Mounting Depth: 3.7"

shipping truck icon Free shipping in USA. Provide zip for delivery date.
List price $624.95
-30% $437.47 /pair

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• 500 watts Peak Each, 250 watts RMS Each
• 1" CNC Aluminum Horn tweeters
• Water-Resistant Paper cone material
• Impedance: 4 ohm
• Sensitivity: 108 dB
• Mounting Depth: 3.7"

DS18 ZXI-354 (Open Box, Good)

240W Peak (80W RMS) 3.5” ZXI Series 4-ohm Full-Range Car Speakers

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DS18 ZXI-354 (Open Box, Good)

240W Peak (80W RMS) 3.5” ZXI Series 4-ohm Full-Range Car Speakers

• 120 watts Peak Each, 40 watts RMS Each
• Glass Fiber cone material
• Impedance: 4 ohm
• Sensitivity: 86 dB

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Free or discounted install kits when available.

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List price $59.95
-40% $35.97 /pair

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• 120 watts Peak Each, 40 watts RMS Each
• Glass Fiber cone material
• Impedance: 4 ohm
• Sensitivity: 86 dB

DS18 PRO-HY6.2MSL (Sold Individually) (Open Box, Great)

300W Peak (150W RMS) 6.5" Pro Hybrid Coaxial Midrange 2-ohm Speaker with Compression Driver Horn

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DS18 PRO-HY6.2MSL (Sold Individually) (Open Box, Great)

300W Peak (150W RMS) 6.5" Pro Hybrid Coaxial Midrange 2-ohm Speaker with Compression Driver Horn

• 300 watts Peak, 150 watts RMS
• 3.15" Titanium Horn Tweeters
• Paper cone material
• Impedance: 2 ohm
• Sensitivity: 97 dB

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List price $79.95
-30% $55.96

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• 300 watts Peak, 150 watts RMS
• 3.15" Titanium Horn Tweeters
• Paper cone material
• Impedance: 2 ohm
• Sensitivity: 97 dB

DS18 PRO-X8.4BM (Sold Individually) (Open Box, Great)

550W Peak (275W RMS) 8” PRO-X Series 4-ohm Mid-Range Loudspeaker

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DS18 PRO-X8.4BM (Sold Individually) (Open Box, Great)

550W Peak (275W RMS) 8” PRO-X Series 4-ohm Mid-Range Loudspeaker

• 550 watts Peak Each, 275 watts RMS Each
• Aluminum Bullet Tweeters
• Non-Pressed Paper cone material
• Impedance: 4 ohm
• Sensitivity: 96 dB

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Free or discounted install kits when available.

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List price $70.95
-30% $49.67

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• 550 watts Peak Each, 275 watts RMS Each
• Aluminum Bullet Tweeters
• Non-Pressed Paper cone material
• Impedance: 4 ohm
• Sensitivity: 96 dB

DS18 PRO-HY6.4MSL (Open Box, Great)

300W Peak (150W RMS) 6.5” Shallow Hybrid Midrange with built-in driver

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DS18 PRO-HY6.4MSL (Open Box, Great)

300W Peak (150W RMS) 6.5” Shallow Hybrid Midrange with built-in driver

• 300 watts Peak, 150 watts RMS
• 3" Horn Tweeter
• Paper cone material
• Impedance: 4 ohm
• Sensitivity: 93 dB
• Priced Per Each Speaker

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Install kits available for most vehicles

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List price $79.95
-30% $55.97

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DS18 PRO-X6.4BM (Sold Individually) (Open Box, Great)

500W Peak (250W RMS) 6.5” PRO-X Series 4-ohm Mid-Range Loudspeaker

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DS18 PRO-X6.4BM (Sold Individually) (Open Box, Great)

500W Peak (250W RMS) 6.5” PRO-X Series 4-ohm Mid-Range Loudspeaker

• 500 watts Peak Each, 250 watts RMS Each
• Red Aluminum Bullet tweeters
• Non-Pressed Paper cone material
• Impedance: 4 ohm
• Sensitivity: 94 dB

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Install kits available for this speaker

found car based on your search
Fits multiple locations in your Optima
List price $52.95
-30% $37.07

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• 500 watts Peak Each, 250 watts RMS Each
• Red Aluminum Bullet tweeters
• Non-Pressed Paper cone material
• Impedance: 4 ohm
• Sensitivity: 94 dB

DS18 8PRO300MB-8 (Sold Individually) (Open Box, Great)

300W Peak (150W RMS) 8" 8PRO Series 8-ohm Mid-bass Speaker

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DS18 8PRO300MB-8 (Sold Individually) (Open Box, Great)

300W Peak (150W RMS) 8" 8PRO Series 8-ohm Mid-bass Speaker

• 300 watts Peak Each, 150 watts RMS Each
• Paper cone material
• Impedance: 8 ohm
• Sensitivity: 97 dB

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Free or discounted install kits when available.

Fits select models only.
Add details to confirm fitment.
List price $71.95
-30% $50.37

In stock

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DS18 EXL-SQ5.25 (Open Box, Great)

680W Peak (160W RMS) 5.25" EXL-SQ Series 2-way 3-ohm Coaxial Car Speakers

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DS18 EXL-SQ5.25 (Open Box, Great)

680W Peak (160W RMS) 5.25" EXL-SQ Series 2-way 3-ohm Coaxial Car Speakers

• 340 watts Peak Each, 80 watts RMS Each
• 1" PEI (Polyetherimide) Dome tweeters with neodynium magnets
• Glass Fiber cone material
• Impedance: 3 ohm
• Sensitivity: 86 dB

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Install kits available for most vehicles

No Fit Icon Doesn't fit your Optima

List price $143.95
-30% $100.76 /pair

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DS18 PRO-DKH1 (Sold Individually) (Open Box, Great)

640W Peak (320W RMS) 2.03" 8-ohm Pro-Audio Compression Driver and Horn Tweeter Kit

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DS18 PRO-DKH1 (Sold Individually) (Open Box, Great)

640W Peak (320W RMS) 2.03" 8-ohm Pro-Audio Compression Driver and Horn Tweeter Kit

• 6.5" Pro-Audio Horn Tweeter and 2.03" Compression Driver
• 640 watts Peak Each
• 320 watts RMS Each
• 8 ohm Impedance

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List price $119.95
-30% $83.97

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• 6.5" Pro-Audio Horn Tweeter and 2.03" Compression Driver
• 640 watts Peak Each
• 320 watts RMS Each
• 8 ohm Impedance

DS18 PRO-FR6NEO (Sold Individually) - Open Box, Great

450W Peak (225W RMS) 6.5” PRO-FR Series 4-ohm Full-Range Bullet Loudspeaker

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DS18 PRO-FR6NEO (Sold Individually) - Open Box, Great

450W Peak (225W RMS) 6.5” PRO-FR Series 4-ohm Full-Range Bullet Loudspeaker

• Peak Each, RMS Each
• Tweeters
• cone material
• Impedance:
• Sensitivity:

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List price $143.95
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• Peak Each, RMS Each
• Tweeters
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• Impedance:
• Sensitivity:

 
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