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1981 Porsche 928

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

Speakers & Speaker Installation for 1981 Porsche 928

Find speakers to upgrade your sound and fit in the factory speaker location for your 928.  After you choose your speakers, we'll help you find speaker adapters, speaker harnesses and other accessories for installation.

All car speakers

Shop All Speaker Locations in the Vehicle

See all speakers that fit, regardless of location.

Front Door Panel Speakers

Front Door Speakers

Speakers for your front door panels

Rear Seat Side Panel Speakers

Rear Seat Side Panel Speakers

Speakers for your rear seat side panel.

Side Panel Speakers

Side Panel Speakers

Speakers for your side panel.

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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.
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NVX NSP525 with Sound Damping

240W Peak (160W RMS) 5.25" N-Series 2-Way Coaxial Car Speakers with 20mm Silk Dome Tweeters + NVX SDBSK2 Premium Sound Damping

NSP525_SDBSK2 big
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NVX NSP525 with Sound Damping

240W Peak (160W RMS) 5.25" N-Series 2-Way Coaxial Car Speakers with 20mm Silk Dome Tweeters + NVX SDBSK2 Premium Sound Damping

• 240 watts Peak Each, 80 watts RMS Each
• 3/4" Silk Dome Tweeters
• Polypropylene cone material
• Impedance: 4 ohm
• Sensitivity: 88 dB
• Mounting Depth: 1.96"

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75
List price $84.73
-17% $69.98

In stock

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• 240 watts Peak Each, 80 watts RMS Each
• 3/4" Silk Dome Tweeters
• Polypropylene cone material
• Impedance: 4 ohm
• Sensitivity: 88 dB
• Mounting Depth: 1.96"

Hertz CX 100 with Sound Damping

240W Peak (80W RMS) 4" Cento Series 2-Way Coaxial Car Speakers + NVX SDSK2 Sound Damping

CX100_SDSK2 big
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Hertz CX 100 with Sound Damping

240W Peak (80W RMS) 4" Cento Series 2-Way Coaxial Car Speakers + NVX SDSK2 Sound Damping

• 120 watts Peak Each, 40 watts RMS Each
• 15/16 Tetolon Dome Tweeters
• Semi-Pressed Paper + Mica cone material
• Impedance: 4 ohm
• Sensitivity: 92 dB

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52
List price $278.74
-5% $264.98

In stock

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• 120 watts Peak Each, 40 watts RMS Each
• 15/16 Tetolon Dome Tweeters
• Semi-Pressed Paper + Mica cone material
• Impedance: 4 ohm
• Sensitivity: 92 dB

Hertz CX 130 with Sound Damping

300W Peak (100W RMS) 5.25" Cento Series 2-Way Coaxial Car Speakers + NVX SDSK2 Sound Damping

CX130_SDSK2 big
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Hertz CX 130 with Sound Damping

300W Peak (100W RMS) 5.25" Cento Series 2-Way Coaxial Car Speakers + NVX SDSK2 Sound Damping

• 150 watts Peak Each, 50 watts RMS Each
• 15/16 Tetolon Dome Tweeters
• cone material
• Impedance: 4 ohm
• Sensitivity: 92.5 dB

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48
List price $278.74
-5% $264.98

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Add to Cart

• 150 watts Peak Each, 50 watts RMS Each
• 15/16 Tetolon Dome Tweeters
• cone material
• Impedance: 4 ohm
• Sensitivity: 92.5 dB

MB Quart RS1-213 with Sound Damping

220W Peak (110W RMS) 5.25” Reference Series 2-way 4-ohm Component Speaker System + NVX SDBSK2 Premium Sound Damping

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MB Quart RS1-213 with Sound Damping

220W Peak (110W RMS) 5.25” Reference Series 2-way 4-ohm Component Speaker System + NVX SDBSK2 Premium Sound Damping

• 110 watts Peak Each, 55 watts RMS Each
• 3/4" Titanium Dome tweeters
• Bamboo Fiber cone material
• Impedance: 4 ohm
• Sensitivity: 86 dB

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48
List price $168.69
-14% $144.94

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Ships in 10-14 days

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• 110 watts Peak Each, 55 watts RMS Each
• 3/4" Titanium Dome tweeters
• Bamboo Fiber cone material
• Impedance: 4 ohm
• Sensitivity: 86 dB

Hertz DSK130.3 with Sound Damping

120W Peak (60W RMS) 5.25” Dieci Series Component Speakers + NVX SDSK2 Sound Damping

DSK1303_SDSK2 big
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Hertz DSK130.3 with Sound Damping

120W Peak (60W RMS) 5.25” Dieci Series Component Speakers + NVX SDSK2 Sound Damping

• 60 Watts Max Each, 30 Watts RMS Each
• Water-repellent pressed paper cone material
• PEI Tweeter Dome
• 4 Ohm Impedance
• Sensitivity: 93 dB

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48
List price $248.74
-14% $214.98

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• 60 Watts Max Each, 30 Watts RMS Each
• Water-repellent pressed paper cone material
• PEI Tweeter Dome
• 4 Ohm Impedance
• Sensitivity: 93 dB

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MTX Audio THUNDER51 with Sound Damping

360W Peak (180W RMS) 5.25" Thunder Series 2-way 4-ohm Component Speakers System + NVX SDBSK2 Premium Sound Damping

THUNDER51_SDBSK2 big
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MTX Audio THUNDER51 with Sound Damping

360W Peak (180W RMS) 5.25" Thunder Series 2-way 4-ohm Component Speakers System + NVX SDBSK2 Premium Sound Damping

• 180 watts Peak Each, 90 watts RMS Each
• 1" Silk Soft Dome tweeters
• Polypropylene cone material
• Impedance: 4 ohm
• Sensitivity: 90 dB

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49
List price $258.69
-17% $214.95

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• 180 watts Peak Each, 90 watts RMS Each
• 1" Silk Soft Dome tweeters
• Polypropylene cone material
• Impedance: 4 ohm
• Sensitivity: 90 dB

Infinity Kappa 503CF with Sound Damping

480W Peak (160W RMS) 5.25” Kappa Series 2-way Component Speakers System + NVX SDSK2 Sound Damping

KAPPA503CF_SDSK2 big
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Infinity Kappa 503CF with Sound Damping

480W Peak (160W RMS) 5.25” Kappa Series 2-way Component Speakers System + NVX SDSK2 Sound Damping

• 240 watts Peak Each, 80 watts RMS Each
• 3/4" Silk Edge-Driven Dome Tweeters
• Glass Fiber cone material
• Impedance: 3 ohm
• Sensitivity: 93 dB

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49
List price $468.69
-37% $294.98

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• 240 watts Peak Each, 80 watts RMS Each
• 3/4" Silk Edge-Driven Dome Tweeters
• Glass Fiber cone material
• Impedance: 3 ohm
• Sensitivity: 93 dB

AudioControl PNW-4 with Installation Accessories

150W Peak (50W RMS) 4″ PNW Series High-fidelity 2-way 3-ohm Coaxial Speakers + 4" Speaker Baffles + Sound Damping, Roller and Panel Removal Kit

PNW4_ACC_KIT big
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AudioControl PNW-4 with Installation Accessories

150W Peak (50W RMS) 4″ PNW Series High-fidelity 2-way 3-ohm Coaxial Speakers + 4" Speaker Baffles + Sound Damping, Roller and Panel Removal Kit

• 75 watts Peak Each, 25 watts RMS Each
• 1" Silk Dome Tweeters
• Rigid Poly Mica cone material
• Impedance: 3 ohm

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224
List price $260.71
-21% $206.06

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• 75 watts Peak Each, 25 watts RMS Each
• 1" Silk Dome Tweeters
• Rigid Poly Mica cone material
• Impedance: 3 ohm

Infinity Kappa 53XF (INFSPKKA53XFAM) with Sound Damping

360W Peak (120W RMS) 5.25" Kappa Series 2-Way Coaxial Car Speakers + NVX SDSK2 Sound Damping

KAPPA53XF_SDSK2 big
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Infinity Kappa 53XF (INFSPKKA53XFAM) with Sound Damping

360W Peak (120W RMS) 5.25" Kappa Series 2-Way Coaxial Car Speakers + NVX SDSK2 Sound Damping

• 180 watts Peak Each, 60 watts RMS Each
• 1" Silk Tweeters
• Glass Fiber cone material
• Impedance: 3 ohm
• Sensitivity: 93 dB

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48
List price $268.69
-35% $174.94

In stock

Add to Cart

• 180 watts Peak Each, 60 watts RMS Each
• 1" Silk Tweeters
• Glass Fiber cone material
• Impedance: 3 ohm
• Sensitivity: 93 dB

Rockford Fosgate Power T152 with Sound Damping

240W Peak (120W RMS) 5.25" Power Series 2-way 4-ohm Coaxial Car Speakers + NVX SDBSK2 Premium Sound Damping

T152_SDBSK2 big
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Rockford Fosgate Power T152 with Sound Damping

240W Peak (120W RMS) 5.25" Power Series 2-way 4-ohm Coaxial Car Speakers + NVX SDBSK2 Premium Sound Damping

• 120 watts Peak Each, 60 watts RMS Each
• 1" Aluminum Dome offset cantilever coaxial mounted tweeters
• Polypropylene-Carbon Fiber Hybrid cone material
• Impedance: 4 ohm
• Sensitivity: 86.5 dB

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70
List price $238.73
$234.98

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• 120 watts Peak Each, 60 watts RMS Each
• 1" Aluminum Dome offset cantilever coaxial mounted tweeters
• Polypropylene-Carbon Fiber Hybrid cone material
• Impedance: 4 ohm
• Sensitivity: 86.5 dB

Alpine S2-S40C with Sound Damping

280W Peak (90W RMS) 4" Next-Generation S-Series 2-way Component Speaker System + NVX SDSK2 Sound Damping

S2S40C_SDSK2 big
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Alpine S2-S40C with Sound Damping

280W Peak (90W RMS) 4" Next-Generation S-Series 2-way Component Speaker System + NVX SDSK2 Sound Damping

• 140 watts Peak Each, 45 watts RMS Each
• 1" Silk Dome Tweeters
• Polypropylene cone material
• Impedance: 4 ohm
• Sensitivity: 88 dB

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49
List price $198.74
-25% $149.95

In stock

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• 140 watts Peak Each, 45 watts RMS Each
• 1" Silk Dome Tweeters
• Polypropylene cone material
• Impedance: 4 ohm
• Sensitivity: 88 dB

Infinity REF407F with Installation Accessories

210W Peak (70W RMS) 4" Reference Series 2-way 3-ohm Coaxial Speakers + 4" Speaker Baffles + Sound Damping, Roller and Panel Removal Kit

REF407F_ACC_KIT big
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Infinity REF407F with Installation Accessories

210W Peak (70W RMS) 4" Reference Series 2-way 3-ohm Coaxial Speakers + 4" Speaker Baffles + Sound Damping, Roller and Panel Removal Kit

• 105 watts Peak Each, 35 watts RMS Each
• 1/2" Textile Balanced Dome Tweeters
• Polypropylene cone material
• Impedance: 3 ohm
• Sensitivity: 92 dB

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223
List price $211.66
-31% $147.01

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• 105 watts Peak Each, 35 watts RMS Each
• 1/2" Textile Balanced Dome Tweeters
• Polypropylene cone material
• Impedance: 3 ohm
• Sensitivity: 92 dB

Infinity REF507F with Installation Accessories

270W Peak (90W RMS) 5.25" Reference Series 2-way 3-ohm Speakers + 5.25" Speaker Baffles + Sound Damping, Roller and Panel Removal Kit

REF507F_ACC_KIT big
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Infinity REF507F with Installation Accessories

270W Peak (90W RMS) 5.25" Reference Series 2-way 3-ohm Speakers + 5.25" Speaker Baffles + Sound Damping, Roller and Panel Removal Kit

• 135 watts Peak Each, 45 watts RMS Each
• 1/2" Textile Balanced Dome Tweeters
• Polypropylene cone material
• Impedance: 3 ohm
• Sensitivity: 92 dB

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229
List price $212.66
-29% $150.51

In stock

Add to Cart

• 135 watts Peak Each, 45 watts RMS Each
• 1/2" Textile Balanced Dome Tweeters
• Polypropylene cone material
• Impedance: 3 ohm
• Sensitivity: 92 dB

Alpine S2-S40 with Sound Damping

280W Peak (90W RMS) 4" S-Series 2-way Coaxial Car Speakers + NVX SDSK2 Sound Damping

S2S40_SDSK2 big
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Alpine S2-S40 with Sound Damping

280W Peak (90W RMS) 4" S-Series 2-way Coaxial Car Speakers + NVX SDSK2 Sound Damping

• 140 watts Peak Each, 45 watts RMS Each
• 3/4" Silk Dome Tweeters
• Polypropylene cone material
• Impedance: 4 ohm
• Sensitivity: 86 dB

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50
List price $148.74
-16% $124.94

In stock

Add to Cart

• 140 watts Peak Each, 45 watts RMS Each
• 3/4" Silk Dome Tweeters
• Polypropylene cone material
• Impedance: 4 ohm
• Sensitivity: 86 dB

Hertz DCX87.3 with Sound Damping

120W Peak (60W RMS) 3.5” Dieci Series 2-Way Coaxial Car Speakers + NVX SDSK2 Sound Damping

DCX873_SDSK2 big
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Hertz DCX87.3 with Sound Damping

120W Peak (60W RMS) 3.5” Dieci Series 2-Way Coaxial Car Speakers + NVX SDSK2 Sound Damping

• 60 watts Peak Each, 30 watts RMS Each
• 5/8 PEI (Polyetherimide) Dome Tweeters
• Water-repellent treated paper cone material
• Impedance: 4 ohm
• Sensitivity: 92 dB

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52
List price $133.74
-14% $114.98

In stock

Add to Cart

• 60 watts Peak Each, 30 watts RMS Each
• 5/8 PEI (Polyetherimide) Dome Tweeters
• Water-repellent treated paper cone material
• Impedance: 4 ohm
• Sensitivity: 92 dB

Infinity REF407F with Sound Damping

210W Peak (70W RMS) 4" Reference Series 2-way 3-ohm Coaxial Speakers + NVX SDSK2 Sound Damping

REF407F_SDSK2 big
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Infinity REF407F with Sound Damping

210W Peak (70W RMS) 4" Reference Series 2-way 3-ohm Coaxial Speakers + NVX SDSK2 Sound Damping

• 105 watts Peak Each, 35 watts RMS Each
• 1/2" Textile Balanced Dome Tweeters
• Polypropylene cone material
• Impedance: 3 ohm
• Sensitivity: 92 dB

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Fits your 928
48
List price $158.69
-21% $124.94

In stock

Add to Cart

• 105 watts Peak Each, 35 watts RMS Each
• 1/2" Textile Balanced Dome Tweeters
• Polypropylene cone material
• Impedance: 3 ohm
• Sensitivity: 92 dB

Infinity Primus 503CF (PR503CF) with Sound Damping

300W Peak (100W RMS) 5.25” Primus Series 2-Way Component Speaker System + NVX SDSK2 Sound Damping

PR503CF_SDSK2 big
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Infinity Primus 503CF (PR503CF) with Sound Damping

300W Peak (100W RMS) 5.25” Primus Series 2-Way Component Speaker System + NVX SDSK2 Sound Damping

• 150 watts Peak Each, 50 watts RMS Each
• 3/4" Silk Dome Tweeters
• Polypropylene cone material
• Impedance: 3 ohm
• Sensitivity: 91 dB

Save 15% Off Package Deals at Checkout!
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Fits your 928
49
List price $168.69
-20% $134.94

In stock

Add to Cart

• 150 watts Peak Each, 50 watts RMS Each
• 3/4" Silk Dome Tweeters
• Polypropylene cone material
• Impedance: 3 ohm
• Sensitivity: 91 dB

Infinity Reference REF-5030cx with Sound Damping

390W Peak (130W RMS) Reference Series 5.25” Component Speaker System + NVX SDSK2 Sound Damping

REF5030CXAM_SDSK2 big
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Infinity Reference REF-5030cx with Sound Damping

390W Peak (130W RMS) Reference Series 5.25” Component Speaker System + NVX SDSK2 Sound Damping

• 195 watts Peak Each, 65 watts RMS Each
• 3/4" Textile Dome Tweeters
• Polypropylene cone material
• Impedance: 3 ohm
• Sensitivity: 93 dB

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Fits your 928
49
List price $268.69
-54% $124.94

In stock

Add to Cart

• 195 watts Peak Each, 65 watts RMS Each
• 3/4" Textile Dome Tweeters
• Polypropylene cone material
• Impedance: 3 ohm
• Sensitivity: 93 dB

Cerwin Vega H735 with Sound Damping

500W Peak (50W RMS) 3.5" HED Series 2-Way Coaxial Car Speakers + NVX SDSK2 Sound Damping

H735_SDSK2 big
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Cerwin Vega H735 with Sound Damping

500W Peak (50W RMS) 3.5" HED Series 2-Way Coaxial Car Speakers + NVX SDSK2 Sound Damping

• 250 watts Peak Each, 25 watts RMS Each
• 1" PEI (Polyetherimide) Balanced Dome Tweeters
• Graphite-Injected Reinforced Spun cone material
• Impedance: 4 ohm
• Sensitivity: 84.5 dB

Save 15% Off Package Deals at Checkout!
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82
List price $90.73
-17% $74.98

In stock

Add to Cart

• 250 watts Peak Each, 25 watts RMS Each
• 1" PEI (Polyetherimide) Balanced Dome Tweeters
• Graphite-Injected Reinforced Spun cone material
• Impedance: 4 ohm
• Sensitivity: 84.5 dB

Infinity Primus PR5012IS (PR5012ISAM) with Installation Accessories

240W Peak (80W RMS) 5.25" Primus Series 2-Way Coaxial Car Speakers + 5.25" Speaker Baffles + Sound Damping, Roller and Panel Removal Kit

PR5012ISAM_ACC_KIT big
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Infinity Primus PR5012IS (PR5012ISAM) with Installation Accessories

240W Peak (80W RMS) 5.25" Primus Series 2-Way Coaxial Car Speakers + 5.25" Speaker Baffles + Sound Damping, Roller and Panel Removal Kit

• 120 watts Peak Each, 40 watts RMS Each
• Textile Edge-driven Dome Tweeters
• Polypropylene cone material
• Impedance: 2.7
• Sensitivity: 88 dB

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221
List price $192.66
-53% $91.31

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Add to Cart

• 120 watts Peak Each, 40 watts RMS Each
• Textile Edge-driven Dome Tweeters
• Polypropylene cone material
• Impedance: 2.7
• Sensitivity: 88 dB

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    A: Yes this page includes all the best Speakers that work in your 928.

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    • Owner's manual
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    • Vehicle produced after 2005: Inside driver's side door
    • Vehicle produced before 2005: Rear passenger doorjamb, glove box, center console, or engine compartment
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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
    • You avoid incompatible radios, speakers, or wiring
    • Installation is smoother, faster, and frustration-free
    • You get the correct accessories the first time

    Whether you're replacing a factory stereo or upgrading your entire audio system, the Fit Finder eliminates uncertainty.

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