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1978 Cadillac DeVille

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.

Universal-Fit Audio for 1978 Cadillac DeVille

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.

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DS18 FLMBX/BK

Flat Mount Bracket Clamp Adaptor for NXL-X and CF-X Series Marine Tower Speakers in Black

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Flat Mount Bracket Clamp Adaptor for NXL-X and CF-X Series Marine Tower Speakers in Black

• Flat mounting bracket for tower speakers
• Fits NXL-X and CF-X series marine tower speakers
• 30° tilt adjustable bracket construction
• Made from high-quality die-cast Kirksite
• Painted in glossy black

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List price $93.99
-17% $77.95

In stock.

• Flat mounting bracket for tower speakers
• Fits NXL-X and CF-X series marine tower speakers
• 30° tilt adjustable bracket construction
• Made from high-quality die-cast Kirksite
• Painted in glossy black

DS18 PRO-TW750CN-8/BK (Sold Individually)

440W Peak (160W RMS) 4" PRO Series 8-ohm Pro Audio Super Bullet Tweeter

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440W Peak (160W RMS) 4" PRO Series 8-ohm Pro Audio Super Bullet Tweeter

• 4" PRO Series Pro Audio Tweeter
• 440 watts Peak, 160 watts RMS
• 8 ohm impedance

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$119.95

In stock

Only 2 Left!

• 4" PRO Series Pro Audio Tweeter
• 440 watts Peak, 160 watts RMS
• 8 ohm impedance

NVX - Worth the Envy - Direct to Consumer Car Audio

DS18 PRO-TW7L (Sold Individually)

200W Peak (100W RMS) 2.3" PRO-TW Series 4-ohm Aluminum Super Bullet Tweeter with RGB LED Lights

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200W Peak (100W RMS) 2.3" PRO-TW Series 4-ohm Aluminum Super Bullet Tweeter with RGB LED Lights

• 2.3" PRO-TW Series Aluminum Super Bullet Tweeter
• Transparent Polycarbonate diaphragm
• RGB-illuminated built-in body
• 200 watts Peak Each
• 100 watts RMS Each
• 4 ohm Impedance

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$83.95

In stock.

• 2.3" PRO-TW Series Aluminum Super Bullet Tweeter
• Transparent Polycarbonate diaphragm
• RGB-illuminated built-in body
• 200 watts Peak Each
• 100 watts RMS Each
• 4 ohm Impedance

DS18 PRO-TWX3 (Sold Individually)

500W Peak (150W RMS) 4" PRO-TWX Series 4-ohm Aluminum Super Bullet Tweeter

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500W Peak (150W RMS) 4" PRO-TWX Series 4-ohm Aluminum Super Bullet Tweeter

• 4" PRO-TWX Series 4-ohm Aluminum Super Bullet Tweeter
• 500 watts Peak Each
• 250 watts Program Power Each
• 125 watts RMS Each
• 4 ohm Impedance
• Sensitivity: 106 dB (1w/1m)

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$50.95

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• 4" PRO-TWX Series 4-ohm Aluminum Super Bullet Tweeter
• 500 watts Peak Each
• 250 watts Program Power Each
• 125 watts RMS Each
• 4 ohm Impedance
• Sensitivity: 106 dB (1w/1m)

DS18 GTX1 (Sold Individually)

240W Peak (120W RMS) 3" 4-ohm Pro Audio Super Bullet Compression Tweeter

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240W Peak (120W RMS) 3" 4-ohm Pro Audio Super Bullet Compression Tweeter

• 3" Titanium Super Bullet Tweeters
• 240 watts Peak Each
• 120 watts RMS Each
• 4 ohm Impedance

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$41.95

In stock.

• 3" Titanium Super Bullet Tweeters
• 240 watts Peak Each
• 120 watts RMS Each
• 4 ohm Impedance

Limited time!

DS18 G4000.5D

4000W Peak (1480W RMS) Class D Gen-X Series 5 Channel Car Amplifier with Bass Remote

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4000W Peak (1480W RMS) Class D Gen-X Series 5 Channel Car Amplifier with Bass Remote

• 130 watts x 4 channel + 300 watts x 1 channel @ 4 ohm
• 220 watts x 4 channel + 600 watts x 1 channel @ 2 ohm
• Bridged: 420 watts x 2 channel @ 4 ohm + 600 watts x 1 channel @ 2 ohm
• Total RMS Power: 1480 watts
• Class D 2 ohm Stable 5-Channel Amplifier

Save 30% off an NVX XKIT46 Amp Kit at Checkout!
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$395.95

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DS18 INF-65G34AH

12V 65Ah Infinite Absorbent Glass Mat (AGM) Car Power Cell Battery

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12V 65Ah Infinite Absorbent Glass Mat (AGM) Car Power Cell Battery

• 12.8-Volt AGM Power Cell
• Perfect for car audio stereo systems of up to 5000 watts
• Leak-proof, non-hazardous design
• Resists extreme vibrations
• 100% sealed and maintenance free
• Absorbed glass mat material

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List price $374.99
-17% $311.95

In stock.

• 12.8-Volt AGM Power Cell
• Perfect for car audio stereo systems of up to 5000 watts
• Leak-proof, non-hazardous design
• Resists extreme vibrations
• 100% sealed and maintenance free
• Absorbed glass mat material

DS18 PRO-TW920 (Sold Individually)

320W Peak (160W RMS) 1.4" Pro Series High Compression Super Bullet Tweeter

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320W Peak (160W RMS) 1.4" Pro Series High Compression Super Bullet Tweeter

• 1.4" Bullet Tweeter
• 320 watts Peak Each
• 160 watts RMS Each
• 4 ohm Impedance

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$83.95

In stock.

• 1.4" Bullet Tweeter
• 320 watts Peak Each
• 160 watts RMS Each
• 4 ohm Impedance

DS18 LRING15

15" RGB LED Ring for Loudspeakers and Speakers

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15" RGB LED Ring for Loudspeakers and Speakers

• 15” RGB LED ring for speakers
• Sealed for all elements use
• 1/2" Spacer Depth
• 16 Million Different Hues of Light
• Pre-drilled holes for easy installation

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List price $77.99
-17% $64.95

Available

Ships in 10-14 days

• 15” RGB LED ring for speakers
• Sealed for all elements use
• 1/2" Spacer Depth
• 16 Million Different Hues of Light
• Pre-drilled holes for easy installation

DS18 DLRING6

6.5" Digital LED Acrylic Ring for Marine Loudspeakers and Speakers

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6.5" Digital LED Acrylic Ring for Marine Loudspeakers and Speakers

• 6.5" Digital LED Acrylic Ring for Marine Speakers
• Water resistant, perfect for harsh environment
• Easy installation, no major modification required
• Sealed acrylic (marine-grade) construction
• Light customizable via LC-DRM Bluetooth module

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$59.95

Available

Ships in 10-14 days

• 6.5" Digital LED Acrylic Ring for Marine Speakers
• Water resistant, perfect for harsh environment
• Easy installation, no major modification required
• Sealed acrylic (marine-grade) construction
• Light customizable via LC-DRM Bluetooth module

DS18 EN-CFJS6 (Sold by Pair)

Empty Single 6.5" Universal Flat Mount Kick Panel Speaker Pods in Carbon Fiber with RGB LED

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Empty Single 6.5" Universal Flat Mount Kick Panel Speaker Pods in Carbon Fiber with RGB LED

• Pair of 6.5" universal flat mount kick panel speaker pods
• Durable high-density and durable plastic construction
• Enclosure houses 1 6.5" coaxial speaker
• Carbon fiber design and construction
• IP36 and UV rated, all elements ready
• Speakers sold by pair

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$227.95

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• Pair of 6.5" universal flat mount kick panel speaker pods
• Durable high-density and durable plastic construction
• Enclosure houses 1 6.5" coaxial speaker
• Carbon fiber design and construction
• IP36 and UV rated, all elements ready
• Speakers sold by pair

Limited time!

DS18 ZXI.4

2200W Peak (740W RMS) Class D ZXI Series 4 Channel Car Amplifier

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2200W Peak (740W RMS) Class D ZXI Series 4 Channel Car Amplifier

• 125 watts x 4 channel @ 4 ohm
• 185 watts x 4 channel @ 2 ohm
• Bridged: 370 watts x 2 channel @ 4 ohm
• Class D 2 ohm Stable 4-Channel Amplifier

Save 30% off an NVX XKIT44 Amp Kit at Checkout!
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$299.95

In stock.


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$119.99

$83.99

$36 Savings!

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DS18 PRO-TSQ3IN1

400W Peak (200W RMS) 3" 4-ohm High Compression Pro Audio Super Bullet Tweeter

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400W Peak (200W RMS) 3" 4-ohm High Compression Pro Audio Super Bullet Tweeter

• 3" Aluminum Alloy Super Bullet Tweeters
• 200 watts Peak Each
• 100 watts RMS Each
• 4 ohm Impedance

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$65.95

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Ships in 10-14 days

• 3" Aluminum Alloy Super Bullet Tweeters
• 200 watts Peak Each
• 100 watts RMS Each
• 4 ohm Impedance

DS18 DLRING69

6x9" Digital LED Acrylic Ring for Marine Loudspeakers and Speakers

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6x9" Digital LED Acrylic Ring for Marine Loudspeakers and Speakers

• 6x9" Digital LED Acrylic Ring for Marine Speakers
• Water resistant, perfect for harsh environment
• Easy installation, no major modification required
• Sealed acrylic (marine-grade) construction
• Light customizable via LC-DRM Bluetooth module

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$69.95

Available

Ships in 10-14 days

• 6x9" Digital LED Acrylic Ring for Marine Speakers
• Water resistant, perfect for harsh environment
• Easy installation, no major modification required
• Sealed acrylic (marine-grade) construction
• Light customizable via LC-DRM Bluetooth module

DS18 PRO-GRILL6MS

Universal Shallow Mesh Grille for Most 6.5" Speakers (Red)

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Universal Shallow Mesh Grille for Most 6.5" Speakers (Red)

• 6.5" universal shallow mesh speaker grill
• Fits speakers and midranges
• Bolt-on easy installation
• Slim and shallow design
• Painted in high glossy red
• Sold individually/per piece

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List price $17.99
-17% $14.95

In stock

Only 2 Left!

• 6.5" universal shallow mesh speaker grill
• Fits speakers and midranges
• Bolt-on easy installation
• Slim and shallow design
• Painted in high glossy red
• Sold individually/per piece

Limited time!

DS18 FRP-1.2K4/BL

1200W RMS Class D FRP Series 4-Channel Car Amplifier (Blue)

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1200W RMS Class D FRP Series 4-Channel Car Amplifier (Blue)

• 120 watts x 4 channel @ 4 ohm
• 200 watts x 4 channel @ 2 ohm
• 300 watts x 4 channel @ 1 ohm
• Bridged: 350 watts x 2 channel @ 4 ohm
• Bridged: 500 watts x 2 channel @ 2 ohm
• Total RMS Power: 1200 watts
• Class D 1 ohm Stable 4-Channel Amplifier

Save 30% off an NVX XKIT44 Amp Kit at Checkout!
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List price $359.99
-17% $299.95

In stock.


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• 120 watts x 4 channel @ 4 ohm
• 200 watts x 4 channel @ 2 ohm
• 300 watts x 4 channel @ 1 ohm
• Bridged: 350 watts x 2 channel @ 4 ohm
• Bridged: 500 watts x 2 channel @ 2 ohm
• Total RMS Power: 1200 watts
• Class D 1 ohm Stable 4-Channel Amplifier

DS18 RY-HDRING8

0.5" Spacer Rings for 8" Harley-Davidson Saddlebag Speakers

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0.5" Spacer Rings for 8" Harley-Davidson Saddlebag Speakers

• Perfect fit for Harley-Davidson saddlebags
• Includes 2 spacers (screws not included)
• Compatible Speaker Size: 8"
• Spacer Thickness: 0.5"

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List price $41.99
-17% $34.95

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Ships in 10-14 days

• Perfect fit for Harley-Davidson saddlebags
• Includes 2 spacers (screws not included)
• Compatible Speaker Size: 8"
• Spacer Thickness: 0.5"

Limited time!

DS18 SXE-2000.4D/RD

2000W Peak (640W RMS) Class D SXE Series 4 Channel Car Amplifier

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2000W Peak (640W RMS) Class D SXE Series 4 Channel Car Amplifier

• 100 watts x 4 channel @ 4 ohm
• 160 watts x 4 channel @ 2 ohm
• Bridged: 320 watts x 3 channel @ 4 ohm
• Total RMS Power: 640 watts
• Class D 2 ohm Stable 4-Channel Amplifier
• Red Brushed Aluminum Body Color

Save 30% off an NVX XKIT44 Amp Kit at Checkout!
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$239.95

In stock


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$36 Savings!

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Used from: $215.98

DS18 GEN-XX10.4DHE

1000W Peak (500W RMS) 10" GEN-XX Series Dual 4-ohm High Excursion Subwoofer

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1000W Peak (500W RMS) 10" GEN-XX Series Dual 4-ohm High Excursion Subwoofer

• Peak Power: 1000 watts
• RMS Power: 500 watts
• Impedance: Dual 4 ohm
• Paper Cone
• Foam Surround
• Mount depth: 6.14"
• Sensitivity: 84.6 dB

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$167.95

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DS18 SB12A

700W Peak (350W RMS) 12" Sealed Amplified Loaded Subwoofer Enclosure

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700W Peak (350W RMS) 12" Sealed Amplified Loaded Subwoofer Enclosure

• 12" Amplified Loaded Subwoofer System
• 350 watts RMS
• Built-In Class D Amplifier
• Variable Bass Boost
• Speaker-Level Inputs
• Wired Remote Bass Level Control

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$359.95

In stock.

NVX - Worth the Envy - Direct to Consumer Car Audio

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    FAQ for Universal-Fit Audio & Electronics in 1978 DeVille

    Q: Can I upgrade or change the Universal-Fit Audio & Electronics in 1978 Cadillac DeVille?

    A: Yes this page includes all the best Universal-Fit Audio & Electronics that work in your DeVille.

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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.