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  1. Home
  2. Polk Audio Store
  3. Discontinued Polk Audio Car Audio & Electronics
  4. Discontinued Polk Audio Car Speakers
  5. Discontinued Polk Audio 4" Speakers

Discontinued Polk Audio 4" Speakers for your 1994 Firebird close

Polk Audio 4" Speakers offer a perfect blend of compact size and powerful performance.

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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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You are currently viewing discontinued products.

Polk 4-Inch 135W Speakers with Kicker CS Series 4-Inch Coaxial Speakers

270W Peak (90W RMS) 4" DB+ Series 2-way Marine/UTV Certified Coaxial Speakers with IP55 Rating for Car, Powersports or Marine Audio Package

DB402 43CSC44 big DISCONTINUED
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Polk 4-Inch 135W Speakers with Kicker CS Series 4-Inch Coaxial Speakers

270W Peak (90W RMS) 4" DB+ Series 2-way Marine/UTV Certified Coaxial Speakers with IP55 Rating for Car, Powersports or Marine Audio Package

• 135 Watts Max Each, 45 Watts RMS Each
• 0.75" shallow tweeter design
• Polypropylene UV tolerant cone
• 4 Ohm Impedance
• Sensitivity: 90dB
• Mounting Depth: 1.79"

No Fit Icon Doesn't fit your Firebird

5

• 135 Watts Max Each, 45 Watts RMS Each
• 0.75" shallow tweeter design
• Polypropylene UV tolerant cone
• 4 Ohm Impedance
• Sensitivity: 90dB
• Mounting Depth: 1.79"

Polk Audio db400

db Series 4" 2-way Speakers (Marine Certified) (db 460)

db400 big DISCONTINUED
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Polk Audio db400

db Series 4" 2-way Speakers (Marine Certified) (db 460)

db Series 4" 2-way Speakers • 35W RMS • 105W Peak • Polymer/mica Composite Woofer • Butyl Rubber Surround • Flat Spider • Stamped Steel Basket • Suitable for Marine Use • Sensitivity: 91dB

No Fit Icon Doesn't fit your Firebird

1

db Series 4" 2-way Speakers • 35W RMS • 105W Peak • Polymer/mica Composite Woofer • Butyl Rubber Surround • Flat Spider • Stamped Steel Basket • Suitable for Marine Use • Sensitivity: 91dB

Polk Audio db401 Open Box

(Open Box) 4" 2-way Car Speakers (Marine Certified) (db 401)

db401 big DISCONTINUED
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Polk Audio db401 Open Box

(Open Box) 4" 2-way Car Speakers (Marine Certified) (db 401)

Power Handling: Peak: 135 watts / RMS: 45 watts • Kapton voice coil former • ABS Grilles • Pole Plate Heat Sink • stamped steel basket • Frequency Response: 85-22,000 Hz

No Fit Icon Doesn't fit your Firebird

Power Handling: Peak: 135 watts / RMS: 45 watts • Kapton voice coil former • ABS Grilles • Pole Plate Heat Sink • stamped steel basket • Frequency Response: 85-22,000 Hz

Polk Audio DB402 and FREE NVX IEWR2 Ear Buds

270W Peak 4" DB+ Series 2-way Marine/UTV Coaxial Speakers for Car, Powersports or Marine Audio

DB402, IEWR2 big DISCONTINUED
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Polk Audio DB402 and FREE NVX IEWR2 Ear Buds

270W Peak 4" DB+ Series 2-way Marine/UTV Coaxial Speakers for Car, Powersports or Marine Audio

• 135 Watts Max Each, 45 Watts RMS Each
• 0.75" shallow tweeter design
• Polypropylene UV tolerant cone
• 4 Ohm Impedance
• Sensitivity: 90dB
• Mounting Depth: 1.79"

No Fit Icon Doesn't fit your Firebird

20

• 135 Watts Max Each, 45 Watts RMS Each
• 0.75" shallow tweeter design
• Polypropylene UV tolerant cone
• 4 Ohm Impedance
• Sensitivity: 90dB
• Mounting Depth: 1.79"

Polk Audio DB+ 4" Coaxial + Sound Deadener (DB402)

270W Peak (90W RMS) 4" DB+ Series 2-way Marine/UTV Certified Coaxial Speakers with IP55 Rating for Car, Powersports or Marine Audio

DB 402_SDSK2 big DISCONTINUED
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Polk Audio DB+ 4" Coaxial + Sound Deadener (DB402)

270W Peak (90W RMS) 4" DB+ Series 2-way Marine/UTV Certified Coaxial Speakers with IP55 Rating for Car, Powersports or Marine Audio

• 135 Watts Max Each, 45 Watts RMS Each
• 0.75" shallow tweeter design
• Polypropylene UV tolerant cone
• 4 Ohm Impedance
• Sensitivity: 90dB
• Mounting Depth: 1.79"

No Fit Icon Doesn't fit your Firebird

117

• 135 Watts Max Each, 45 Watts RMS Each
• 0.75" shallow tweeter design
• Polypropylene UV tolerant cone
• 4 Ohm Impedance
• Sensitivity: 90dB
• Mounting Depth: 1.79"

Polk Audio DB402 (DB 402) (Open Box, Great)

270W Peak (90W RMS) 4" DB+ Series 2-way 4-ohm Car & Marine Coaxial Speakers

DB402 big DISCONTINUED
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Polk Audio DB402 (DB 402) (Open Box, Great)

270W Peak (90W RMS) 4" DB+ Series 2-way 4-ohm Car & Marine Coaxial Speakers

• 135 watts Peak Each, 45 watts RMS Each
• 3/4" Silk Dome Tweeters
• Polypropylene cone material
• Impedance: 4 ohm
• Sensitivity: 90 dB

No Fit Icon Doesn't fit your Firebird

• 135 watts Peak Each, 45 watts RMS Each
• 3/4" Silk Dome Tweeters
• Polypropylene cone material
• Impedance: 4 ohm
• Sensitivity: 90 dB

 
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    Polk Audio 4" Speakers Information

    4" speakers from Polk Audio are an excellent choice for crystal clear music. Replace those factory speakers and quickly notice the difference in sound and quality of your music and audio. When you are ready for new 4" speakers, think of Polk Audio.
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    We love people and we're ready to help you! See what separates us from our competition.

    Take advantage of our VIP rewards like 10% back on your purchases, free 2-day shipping, extended warranties, and free returns! Gain access to all of these rewards without any membership fees.
    Get great discounted (and possibly FREE) installation accessories with most car stereo purchases. This includes dash kits, wiring harnesses and antenna adapters that you will need to properly install your new car stereo.
    We are an Authorized Dealer for all the brands we sell, including the most premium brands in car and marine audio such as Hertz, JL Audio, NVX, Rockford Fosgate, Kicker, Alpine, Kenwood and many more.
    Shop Deals and get up to 30% off premium brands! Shop Now! We are always looking out for the best products and deals to offer our customers. Don’t pay too much by shopping elsewhere!
    We have information on brands, gear, and more for you to explore! Check out our YouTube Channel for helpful how-to videos, product reviews, and Q&As. For a more detailed look, also visit our Learning Center!
    Our trained experts are here to assist you! They are just a phone call or click away to help you get the right gear for you and your vehicle!
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    2004 Suzuki Aerio

    1994 Pontiac Firebird

    2011 Audi TT

    2007 Mitsubishi Eclipse

    2001 Dodge Intrepid

    2007 Jaguar S-Type

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    Modern vehicles often require specific brackets, wiring harnesses, and mounting solutions. A fit guide ensures:

    • You see only parts engineered for your exact vehicle
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