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1981 BMW 733i

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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 1981 BMW 733i

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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Tweeters (Pro and special-fit) ✕
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Tweeters (Pro and special-fit),
Subwoofers (1,132)
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Subwoofers with a box (778)
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RCA cables and accessories (264)
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Lighting accessories (176)
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Tweeters (Pro and special-fit) (151)
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Power and ground wire (130)
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Subwoofers with an amplifier (101)
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Line-out converters (90)
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Speaker wire (73)
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Connectors (55)
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Sound processors (37)
Alarms (34)
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Installation accessories (25)
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Trigger output and bypass modules (24)
Alarm accessories (23)
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Split loom and heat shrink (22)
Diodes and resistors (20)
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Equalizers (16)
Noise filters (14)
Terminal cups (14)
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Rearview monitor and mirrors (13)
Adapters (12)
Radar and laser detectors (11)
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Speaker diaphragms (10)
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Bass booster enhancers and processors (8)
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2-way and CB radios (7)
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Carpet (7)
Panel and clip removal tools (7)
Tweeters (7)
Voltmeters (7)
Blindspot cameras and sensors (6)
Gauge adapters (6)
Grommets and firewall bushings (6)
Headlights (6)
Passive crossovers (6)
Sensors (6)
Box ports (5)
Knockout panel mount hardware (5)
Line drivers (5)
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Parking sensors (4)
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Subwoofer (3)
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In-motion video/navigation bypass (2)
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Alarms with remote start (1)
Backup batteries (1)
Cable management (1)
Connector sets (1)
FM modulators and transmitters (1)
Multi-camera and DVR systems (1)
Overhead monitors (1)
Remote mount media players (1)
Price Range
Diaphragm Material
Mounting Type (Compression Drivers)
Throat Size
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.
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DS18 GTX1XL (Sold Individually)

320W Peak (160W RMS) 3.75" 4-ohm Pro-Audio Super Bullet Compression Tweeter

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DS18 GTX1XL (Sold Individually)

320W Peak (160W RMS) 3.75" 4-ohm Pro-Audio Super Bullet Compression Tweeter

• 3.75" Aluminum Super Bullet Tweeter
• 320 watts Peak Each
• 160 watts RMS Each
• 4 ohm Impedance

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$53.95

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Only 3 Left!

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• 3.75" Aluminum Super Bullet Tweeter
• 320 watts Peak Each
• 160 watts RMS Each
• 4 ohm Impedance

DS18 PRO-TWX6 (Sold individually)

480W Peak (120W RMS) 4x4" PRO-TWX Series 8-ohm Aluminum Super Bullet Tweeter

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DS18 PRO-TWX6 (Sold individually)

480W Peak (120W RMS) 4x4" PRO-TWX Series 8-ohm Aluminum Super Bullet Tweeter

• 4x4" PRO-TWX 8-ohm Aluminum Super Bullet Tweeter
• 480 watts Peak Each
• Program Power: 240 watts each
• 120 watts RMS Each
• 8 ohm Impedance
• Sensitivity: 112 dB (1w/1m)

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$53.95

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• 4x4" PRO-TWX 8-ohm Aluminum Super Bullet Tweeter
• 480 watts Peak Each
• Program Power: 240 watts each
• 120 watts RMS Each
• 8 ohm Impedance
• Sensitivity: 112 dB (1w/1m)

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Earthquake Sound HDX2

250W Peak (150W RMS) 1" 8-ohm Pro Audio Compression Driver

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Earthquake Sound HDX2

250W Peak (150W RMS) 1" 8-ohm Pro Audio Compression Driver

• 1" Pro-Audio Compression Driver
• 250 watts Peak Each
• 150 watts RMS Each
• 8 ohm Impedance

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$89.00

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• 1" Pro-Audio Compression Driver
• 250 watts Peak Each
• 150 watts RMS Each
• 8 ohm Impedance

DS18 PRO-TWX5 (Sold Individually)

500W Peak (250W RMS) 4" x 5.35" 4-ohm Pro Audio Super Bullet Tweeter

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DS18 PRO-TWX5 (Sold Individually)

500W Peak (250W RMS) 4" x 5.35" 4-ohm Pro Audio Super Bullet Tweeter

• 4"x5.35" Aluminum Super Bullet Tweeters
• 500 watts Peak Each
• 250 watts RMS Each
• 4 ohm Impedance

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$52.95

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• 4"x5.35" Aluminum Super Bullet Tweeters
• 500 watts Peak Each
• 250 watts RMS Each
• 4 ohm Impedance

DS18 PRO-TW3L (Sold Individually)

500W Peak (250W RMS) 4" PRO-TW Series 4-ohm Aluminum Super Bullet Tweeter with RGB LED Lights

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DS18 PRO-TW3L (Sold Individually)

500W Peak (250W RMS) 4" PRO-TW Series 4-ohm Aluminum Super Bullet Tweeter with RGB LED Lights

• 4" PRO-TW Series 4-ohm Aluminum Super Bullet Tweeter
• RGB LED illumination
• 500 watts Peak Each
• 200 watts RMS Each
• 4 ohm Impedance
• Sensitivity: 105 dB

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$57.95

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• 4" PRO-TW Series 4-ohm Aluminum Super Bullet Tweeter
• RGB LED illumination
• 500 watts Peak Each
• 200 watts RMS Each
• 4 ohm Impedance
• Sensitivity: 105 dB

DS18 PRO-DR1.75

600W Peak (300W RMS) 1” Throat 8-ohm Twist-on Compression Driver with Titanium Voice Coil

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DS18 PRO-DR1.75

600W Peak (300W RMS) 1” Throat 8-ohm Twist-on Compression Driver with Titanium Voice Coil

• 1" Throat compression driver
• Titanium Diaphragm Material
• 600 watts Peak, 300 watts RMS
• 8 ohm Impedance

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List price $56.99
-18% $46.95

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• 1" Throat compression driver
• Titanium Diaphragm Material
• 600 watts Peak, 300 watts RMS
• 8 ohm Impedance

DS18 PRO-TWX1

480W Peak (240W RMS) 3.8" 4-ohm Pro Audio Super Bullet Tweeters

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DS18 PRO-TWX1

480W Peak (240W RMS) 3.8" 4-ohm Pro Audio Super Bullet Tweeters

• 3.8" Aluminum Super Bullet Tweeters
• 240 watts Peak Each
• 120 watts RMS Each
• 4 ohm Impedance

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$41.95

In stock.

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• 3.8" Aluminum Super Bullet Tweeters
• 240 watts Peak Each
• 120 watts RMS Each
• 4 ohm Impedance

DS18 PRO-TW5L (Sold Individually)

500W Peak (250W RMS) 4" x 5.35" PRO-TW Series 4-ohm Aluminum Super Bullet Tweeter with RGB LED Lights

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DS18 PRO-TW5L (Sold Individually)

500W Peak (250W RMS) 4" x 5.35" PRO-TW Series 4-ohm Aluminum Super Bullet Tweeter with RGB LED Lights

• 4" x 5.35" PRO-TW Series 4-ohm Aluminum Super Bullet Tweeter
• RGB LED illumination
• 500 watts Peak Each
• 250 watts RMS Each
• 4 ohm Impedance
• Sensitivity: 107 dB

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$38.95

In stock.

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• 4" x 5.35" PRO-TW Series 4-ohm Aluminum Super Bullet Tweeter
• RGB LED illumination
• 500 watts Peak Each
• 250 watts RMS Each
• 4 ohm Impedance
• Sensitivity: 107 dB

DS18 PRO-TW7LD

200W Peak (50W RMS) 2.3" Pro Audio 4-ohm Super Bullet Tweeter with Digital LED Light

PRO-TW7LD big
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DS18 PRO-TW7LD

200W Peak (50W RMS) 2.3" Pro Audio 4-ohm Super Bullet Tweeter with Digital LED Light

• 2.3" Super Bullet Tweeter with Digital LED Lights
• 200 watts Peak / 50 watts RMS
• 4 ohms impedance
• 1" Aluminum voice coil
• Body Finish: Translucid LED Illuminated

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List price $119.99
-17% $99.95

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• 2.3" Super Bullet Tweeter with Digital LED Lights
• 200 watts Peak / 50 watts RMS
• 4 ohms impedance
• 1" Aluminum voice coil
• Body Finish: Translucid LED Illuminated

DS18 PRO-DR250

300W Peak (200W RMS) 1” Throat 8-ohm Twist-on Compression Driver with Phenolic Voice Coil

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DS18 PRO-DR250

300W Peak (200W RMS) 1” Throat 8-ohm Twist-on Compression Driver with Phenolic Voice Coil

• 1" Throat compression driver
• Phenolic Diaphragm Material
• 300 watts Peak, 200 watts RMS
• 8 ohm Impedance

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List price $50.99
-18% $41.95

In stock.

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• 1" Throat compression driver
• Phenolic Diaphragm Material
• 300 watts Peak, 200 watts RMS
• 8 ohm Impedance

DS18 PRO-TWN2 (Sold Individually)

200W Peak (50W RMS) 3" PRO-TWN Series 4-ohm Aluminum Super Bullet Tweeter

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DS18 PRO-TWN2 (Sold Individually)

200W Peak (50W RMS) 3" PRO-TWN Series 4-ohm Aluminum Super Bullet Tweeter

• 3" PRO-TWN 4-ohm Aluminum Super Bullet Tweeter
• 200 watts Peak Each
• 100 watts Program Power each
• 50 watts RMS Each
• 4 ohm Impedance

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$76.95

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• 3" PRO-TWN 4-ohm Aluminum Super Bullet Tweeter
• 200 watts Peak Each
• 100 watts Program Power each
• 50 watts RMS Each
• 4 ohm Impedance

Hertz ST 35A NEO

240W Peak 1.8" NEO Series 4-ohm High-Efficiency Compression Bullet Driver

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Hertz ST 35A NEO

240W Peak 1.8" NEO Series 4-ohm High-Efficiency Compression Bullet Driver

• 1.8" NEO Series Pro-Audio Bullet Tweeters
• 120 watts Peak Each
• RMS Each
• 4 ohm Impedance

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List price $705.00
-15% $599.99

Available

Ships in 10-14 days

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• 1.8" NEO Series Pro-Audio Bullet Tweeters
• 120 watts Peak Each
• RMS Each
• 4 ohm Impedance

DS18 PRO-TWN6.8

300W Peak (75W RMS) 4" High Compression 8-ohm Super Bullet Tweeter

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DS18 PRO-TWN6.8

300W Peak (75W RMS) 4" High Compression 8-ohm Super Bullet Tweeter

• 4" High Compression Super Bullet Tweeter
• 300 watts Peak / 75 watts RMS
• 8 ohms impedance
• 1.25" Polyimide voice coil
• Black / Machined material
• Tweeter sold indvidually

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List price $86.99
-17% $71.95

Available

Ships in 10-14 days

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• 4" High Compression Super Bullet Tweeter
• 300 watts Peak / 75 watts RMS
• 8 ohms impedance
• 1.25" Polyimide voice coil
• Black / Machined material
• Tweeter sold indvidually

DS18 PRO-DRNSC1.5

320W Peak (80W RMS) 1" Throat 8-ohm Twist-on Polyimide Compression Driver

PRO-DRNSC1.5 big
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DS18 PRO-DRNSC1.5

320W Peak (80W RMS) 1" Throat 8-ohm Twist-on Polyimide Compression Driver

• 1" Throat compression driver
• Polyimide Diaphragm Material
• 320 watts Peak, 80 watts RMS
• 8 ohm Impedance

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List price $115.99
-17% $95.95

In stock.

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• 1" Throat compression driver
• Polyimide Diaphragm Material
• 320 watts Peak, 80 watts RMS
• 8 ohm Impedance

Massive Audio PAT 250 (Sold Individually)

200W Peak (70W RMS) 1" 8-ohm Pro-Audio Screw-on Midrange Tweeter

PAT 250 big
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Massive Audio PAT 250 (Sold Individually)

200W Peak (70W RMS) 1" 8-ohm Pro-Audio Screw-on Midrange Tweeter

• 1" Phenolic Pro-Audio Midrange Tweeter
• 200 watts Peak Each
• 70 watts RMS Each
• 8 ohm Impedance

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List price $42.49
-20% $33.99

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Ships in 10-14 days

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Used from: $23.79

• 1" Phenolic Pro-Audio Midrange Tweeter
• 200 watts Peak Each
• 70 watts RMS Each
• 8 ohm Impedance

DS18 PRO-TWN1 (Sold Individually)

240W Peak (60W RMS) 3" PRO-TWN Series 4-ohm Aluminum Slim Super Bullet Tweeter

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DS18 PRO-TWN1 (Sold Individually)

240W Peak (60W RMS) 3" PRO-TWN Series 4-ohm Aluminum Slim Super Bullet Tweeter

• 3" PRO-TWN 4-ohm Aluminum Slim Super Bullet Tweeter
• 240 watts Peak Each
• 120W Program Power each
• 60 watts RMS Each
• 4 ohm Impedance

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$40.95

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• 3" PRO-TWN 4-ohm Aluminum Slim Super Bullet Tweeter
• 240 watts Peak Each
• 120W Program Power each
• 60 watts RMS Each
• 4 ohm Impedance

DS18 PRO-DR1.354

320W Peak (80W RMS) 1” Throat 4-ohm Twist-on Compression Driver with Titanium Voice Coil

PRO-DR1.354 big
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DS18 PRO-DR1.354

320W Peak (80W RMS) 1” Throat 4-ohm Twist-on Compression Driver with Titanium Voice Coil

• 1" Throat compression driver
• Titanium Diaphragm Material
• 320 watts Peak, 80 watts RMS
• 4 ohm Impedance

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List price $47.99
-17% $39.95

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• 1" Throat compression driver
• Titanium Diaphragm Material
• 320 watts Peak, 80 watts RMS
• 4 ohm Impedance

DS18 PRO-D3 (Sold Individually)

600W Peak (300W RMS) 2" PRO Series 8-Ohm Throat Bolt-On Compression Driver

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DS18 PRO-D3 (Sold Individually)

600W Peak (300W RMS) 2" PRO Series 8-Ohm Throat Bolt-On Compression Driver

• [SIZE]” Phenolic Pro Audio Throat Bolt-on Compression Driver
• 600 watts Peak Each
• 300 watts RMS Each
• 8 ohm Impedance

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$199.95

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• [SIZE]” Phenolic Pro Audio Throat Bolt-on Compression Driver
• 600 watts Peak Each
• 300 watts RMS Each
• 8 ohm Impedance

DS18 PRO-DN22PH.8

800W Peak (200W RMS) 2" Throat 8-ohm Bolt-On Compression Driver with Phenolic Voice Coil

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DS18 PRO-DN22PH.8

800W Peak (200W RMS) 2" Throat 8-ohm Bolt-On Compression Driver with Phenolic Voice Coil

• 2" Throat compression driver
• Phenolic Diaphragm Material
• 800 watts Peak, 200 watts RMS
• 8 ohm Impedance

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List price $287.99
-17% $239.95

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• 2" Throat compression driver
• Phenolic Diaphragm Material
• 800 watts Peak, 200 watts RMS
• 8 ohm Impedance

DS18 PRO-TWN6.4 (Sold Individually)

300W Peak (75W RMS) 4" PRO-TWN Series 4-ohm Aluminum Super Bullet Tweeter

PRO-TWN6.4 big
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DS18 PRO-TWN6.4 (Sold Individually)

300W Peak (75W RMS) 4" PRO-TWN Series 4-ohm Aluminum Super Bullet Tweeter

• 4" PRO-TWN Series 4-ohm Aluminum Super Bullet Tweeter
• 300 watts Peak Each
• 150 watts Program Power each
• 75 watts RMS Each
• 4 ohm Impedance

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$71.95

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• 4" PRO-TWN Series 4-ohm Aluminum Super Bullet Tweeter
• 300 watts Peak Each
• 150 watts Program Power each
• 75 watts RMS Each
• 4 ohm Impedance

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    FAQ for Universal-Fit Audio & Electronics in 1981 733i

    Q: Can I upgrade or change the Universal-Fit Audio & Electronics in 1981 BMW 733i?

    A: Yes this page includes all the best Universal-Fit Audio & Electronics that work in your 733i.

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