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1981 BMW 733i

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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

Speakers & Speaker Installation for 1981 BMW 733i

Find speakers to upgrade your sound and fit in the factory speaker location for your 733i.  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.

Kick Panel

Kick Panel Speakers

Speakers for your kick panel.

Rear Deck Corner

Rear Deck Corner Speakers

Speakers for your corner rear deck

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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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MTX Audio TERMINATOR52

140W Peak (70W RMS) 5.25" Terminator Series 2 Way Component 4-ohm Speakers

TERMINATOR52 big
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MTX Audio TERMINATOR52

140W Peak (70W RMS) 5.25" Terminator Series 2 Way Component 4-ohm Speakers

• 70 watts Peak Each, 35 watts RMS Each
• 1" Mylar Dome Tweeters
• Polypropylene cone material
• Impedance: 4 ohm
• Sensitivity: 83.6 dB

Free Speaker Accessory at Checkout!
shipping truck icon Free shipping in USA. Provide zip for delivery date.
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Install kits available for most vehicles

found car based on your search
Fits the following location in your 733i
  • Rear Deck Corner
5
List price $129.95
-69% $39.99 /set

In stock

Only 3 Left!

Add to Cart
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MTX TERMINATOR46

160W Peak (80W RMS) 4x6” Terminator Series 2 Way Coaxial 4-ohm Speakers

TERMINATOR46 big
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MTX TERMINATOR46

160W Peak (80W RMS) 4x6” Terminator Series 2 Way Coaxial 4-ohm Speakers

• 80 watts Peak Each, 40 watts RMS Each
• Silk Dome tweeters
• Polypropylene cone material
• Impedance: 4 ohm
• Sensitivity: 86.1 dB

shipping truck icon Free shipping in USA. Provide zip for delivery date.
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Install kits available for most vehicles

found car based on your search
Fits the following location in your 733i
  • Kick Panel
3
List price $64.95
-15% $54.95 /pair

In stock

Add to Cart
See all 8 special offers
Limited time!

MTX Audio THUNDER52

180W Peak (90W RMS) 5.25" Thunder Series 2 Way Coaxial 4-ohm Speakers

THUNDER52 big
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MTX Audio THUNDER52

180W Peak (90W RMS) 5.25" Thunder Series 2 Way Coaxial 4-ohm Speakers

• 45 watts RMS Each
• 1" Silk Dome tweeters
• Polypropylene cone material
• Impedance: 4 ohm
• Sensitivity: 92 dB

Free Speaker Accessory at Checkout!
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Install kits available for most vehicles

found car based on your search
Fits the following location in your 733i
  • Rear Deck Corner
2
$119.95 /pair

In stock

Add to Cart
See all 12 special offers

MTX TERMINATOR35

80W Peak (40W RMS) 3.5" Terminator Series 2 Way Coaxial 4-ohm Car Speakers

TERMINATOR35 big
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MTX TERMINATOR35

80W Peak (40W RMS) 3.5" Terminator Series 2 Way Coaxial 4-ohm Car Speakers

• 40 watts Peak Each, 20 watts RMS Each
• Silk Dome tweeters
• Polypropylene cone material
• Impedance: 4 ohm
• Sensitivity: 86 dB

shipping truck icon Free shipping in USA. Provide zip for delivery date.
install icon

Install kits available for most vehicles

found car based on your search
Fits the following location in your 733i
  • Rear Deck Corner
List price $59.95
-17% $49.95 /pair

In stock

Add to Cart
See all 12 special offers

MTX TERMINATOR5

140W Peak (70W RMS) 5.25" Terminator Series 2 Way Coaxial 4-ohm Speakers

TERMINATOR5 big
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MTX TERMINATOR5

140W Peak (70W RMS) 5.25" Terminator Series 2 Way Coaxial 4-ohm Speakers

• 70 watts Peak Each, 35 watts RMS Each
• Silk Dome tweeters
• Polypropylene cone material
• Impedance: 4 ohm
• Sensitivity: 85.3 dB

shipping truck icon Free shipping in USA. Provide zip for delivery date.
install icon

Install kits available for most vehicles

found car based on your search
Fits the following location in your 733i
  • Rear Deck Corner
List price $69.95
-14% $59.95 /pair

In stock

Add to Cart
See all 12 special offers
Limited time!

MTX Audio THUNDER51

360W Peak (180W RMS) 5.25" Thunder Series 2-way 4-ohm Component Speakers System

THUNDER51 big
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MTX Audio THUNDER51

360W Peak (180W RMS) 5.25" Thunder Series 2-way 4-ohm Component Speakers System

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

Free Speaker Accessory at Checkout!
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VIP Product Get $25.00 in rewards to spend later

install icon

Install kits available for most vehicles

found car based on your search
Fits the following location in your 733i
  • Rear Deck Corner
1
$249.95 /set

In stock

Add to Cart
See all 12 special offers
Limited time!

MTX Audio THUNDER46

160W Peak (80W RMS) 4x6" Thunder Series 2 Way Coaxial 4-ohm Speakers

THUNDER46 big
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MTX Audio THUNDER46

160W Peak (80W RMS) 4x6" Thunder Series 2 Way Coaxial 4-ohm Speakers

• Peak Each, 40 watts RMS Each
• 1" Silk Soft Dome tweeters
• Polypropylene cone material with concave design
• Impedance: 4 ohm
• Sensitivity: 92 dB

Free Speaker Accessory at Checkout!
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VIP Product Get $10.00 in rewards to spend later

install icon

Install kits available for most vehicles

found car based on your search
Fits the following location in your 733i
  • Kick Panel
$99.95 /pair

Available

Ships in 10-14 days

Add to Cart
See all 8 special offers
Limited time!

MTX SS5

250W RMS 5.25" Signature Series 2 Way Component 4-ohm System

SS5 big
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MTX SS5

250W RMS 5.25" Signature Series 2 Way Component 4-ohm System

• 125 watts RMS Each
• 1-3/16" Teteron Dome tweeters
• Glass Fiber cone material
• Impedance: 4 ohm
• Sensitivity: 84.9 dB

Free Speaker Accessory at Checkout!
shipping truck icon Free shipping in USA. Provide zip for delivery date.
VIP Star Icon

VIP Product Get $50.00 in rewards to spend later

install icon

Install kits available for most vehicles

found car based on your search
Fits the following location in your 733i
  • Rear Deck Corner
$499.95 /set

Available

Ships in 10-14 days

Add to Cart
See all 12 special offers

MTX TERMINATOR46 (2-Pairs, 4-Total)

320W Peak (160W RMS) 4x6” Terminator Series 2-way Coaxial Speakers (2-Pairs)

TERMINATOR46_2 big
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MTX TERMINATOR46 (2-Pairs, 4-Total)

320W Peak (160W RMS) 4x6” Terminator Series 2-way Coaxial Speakers (2-Pairs)

• 80 watts Peak Each, 40 watts RMS Each
• 1" Silk Dome Tweeters
• Polypropylene cone material
• Impedance: 4 ohm
• Sensitivity: 86.1 dB

shipping truck icon Free shipping in USA. Provide zip for delivery date.
found car based on your search
Fits your 733i
3
List price $129.90
-15% $109.90

In stock

Only 2 Left!

Add to Cart

• 80 watts Peak Each, 40 watts RMS Each
• 1" Silk Dome Tweeters
• Polypropylene cone material
• Impedance: 4 ohm
• Sensitivity: 86.1 dB

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

Save 15% Off Package Deals at Checkout!
shipping truck icon Free shipping in USA. Provide zip for delivery date.
found car based on your search
Fits your 733i
48
$264.94

In stock

Add to Cart

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

MTX Audio THUNDER46 with Sound Damping

160W Peak (80W RMS) 4x6" Thunder Dome Series 2-way 4-ohm Coaxial Speakers + NVX SDBSK2 Premium Sound Damping

THUNDER46_SDBSK2 big
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MTX Audio THUNDER46 with Sound Damping

160W Peak (80W RMS) 4x6" Thunder Dome Series 2-way 4-ohm Coaxial Speakers + NVX SDBSK2 Premium Sound Damping

• 80 watts Peak Each, 40 watts RMS Each
• 0.98" Silk Soft Dome tweeters
• Polypropylene cone material with concave design
• Impedance: 4 ohm
• Sensitivity: 92 dB

Save 15% Off Package Deals at Checkout!
shipping truck icon Free shipping in USA. Provide zip for delivery date.
found car based on your search
Fits your 733i
47
List price $118.69
$114.94

Available

Ships in 10-14 days

Add to Cart

• 80 watts Peak Each, 40 watts RMS Each
• 0.98" Silk Soft Dome tweeters
• Polypropylene cone material with concave design
• Impedance: 4 ohm
• Sensitivity: 92 dB

MTX Audio RTX108 with Speaker Installation Kit

180W Peak (90W RMS) 5.25" Thunder Series 2-Way Component System with Speaker Baffles, Sound Damping, Roller, and Panel Removal Kit

THUNDER51, XBAF525, SDSK2, SDRLR1, BTK106 big
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MTX Audio RTX108 with Speaker Installation Kit

180W Peak (90W RMS) 5.25" Thunder Series 2-Way Component System with Speaker Baffles, Sound Damping, Roller, and Panel Removal Kit

• Peak Power: 180W • RMS Power: 90W
• 1" Soft Dome Tweeter
• Mounting Depth: 2.19"
• Polypropylene Cone and Rubber Surround

Save 15% Off Package Deals at Checkout!
shipping truck icon Free shipping in USA. Provide zip for delivery date.
install icon

Install kits available for most vehicles

found car based on your search
Fits the following location in your 733i
  • Rear Deck Corner
149
List price $312.66
-7% $289.98 /set

In stock

Add to Cart

• Peak Power: 180W • RMS Power: 90W
• 1" Soft Dome Tweeter
• Mounting Depth: 2.19"
• Polypropylene Cone and Rubber Surround

MTX THUNDER52 with Installation Accessories

90W RMS 5.25" 2-Way Coaxial Speakers with Speaker Baffles, Sound Damping, Roller, and Panel Removal Kit

THUNDER52, XBAF525, SDSK2, SDRLR1, BTK106 big
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MTX THUNDER52 with Installation Accessories

90W RMS 5.25" 2-Way Coaxial Speakers with Speaker Baffles, Sound Damping, Roller, and Panel Removal Kit

• 90 watts Peak Each, 45 watts RMS Each
• 1" Silk Dome Tweeters
• Polypropylene cone material
• Impedance: 4 ohm
• Sensitivity: 92 dB

Save 15% Off Package Deals at Checkout!
shipping truck icon Free shipping in USA. Provide zip for delivery date.
install icon

Install kits available for most vehicles

found car based on your search
Fits the following location in your 733i
  • Rear Deck Corner
150
List price $192.66
-17% $159.98 /pair

In stock

Add to Cart

• 90 watts Peak Each, 45 watts RMS Each
• 1" Silk Dome Tweeters
• Polypropylene cone material
• Impedance: 4 ohm
• Sensitivity: 92 dB

MTX Audio THUNDER52 with Sound Damping

180W Peak (90W RMS) 5.25" Thunder Dome Series 2-way 4-ohm Coaxial Car Speakers + NVX SDBSK2 Premium Sound Damping

THUNDER52_SDBSK2 big
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MTX Audio THUNDER52 with Sound Damping

180W Peak (90W RMS) 5.25" Thunder Dome Series 2-way 4-ohm Coaxial Car Speakers + NVX SDBSK2 Premium Sound Damping

• 90 watts Peak Each, 45 watts RMS Each
• 1" Silk Dome tweeters
• Polypropylene cone material
• Impedance: 4 ohm
• Sensitivity: 92 dB

Save 15% Off Package Deals at Checkout!
shipping truck icon Free shipping in USA. Provide zip for delivery date.
found car based on your search
Fits your 733i
49
List price $138.69
$134.94

In stock

Add to Cart

• 90 watts Peak Each, 45 watts RMS Each
• 1" Silk Dome tweeters
• Polypropylene cone material
• Impedance: 4 ohm
• Sensitivity: 92 dB

MTX Audio THUNDER51 (2-Pairs, 4-Total)

720W Peak (360W RMS) 5.25" Thunder Series 2-Way Component System (2-Pairs)

THUNDER51_2 big
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MTX Audio THUNDER51 (2-Pairs, 4-Total)

720W Peak (360W RMS) 5.25" Thunder Series 2-Way Component System (2-Pairs)

• Peak Power: 180W • RMS Power: 90W
• 1" Soft Dome Tweeter
• Mounting Depth: 2.19"
• Polypropylene Cone and Rubber Surround

Save 15% Off Package Deals at Checkout!
shipping truck icon Free shipping in USA. Provide zip for delivery date.
found car based on your search
Fits your 733i
1
$499.90

In stock

Only 2 Left!

Add to Cart

• Peak Power: 180W • RMS Power: 90W
• 1" Soft Dome Tweeter
• Mounting Depth: 2.19"
• Polypropylene Cone and Rubber Surround

MTX TERMINATOR46 with Sound Damping

160W Peak (80W RMS) 4x6” Terminator Series 2-way 4-ohm Coaxial Car Speakers + NVX SDBSK2 Premium Sound Damping

TERMINATOR46_SDBSK2 big
Go to item page Right Arrow Icon of Right Arrow

MTX TERMINATOR46 with Sound Damping

160W Peak (80W RMS) 4x6” Terminator Series 2-way 4-ohm Coaxial Car Speakers + NVX SDBSK2 Premium Sound Damping

• 80 watts Peak Each, 40 watts RMS Each
• 1" Mylar Dome tweeters
• Polypropylene cone material
• Impedance: 4 ohm
• Sensitivity: 86.1 dB

shipping truck icon Free shipping in USA. Provide zip for delivery date.
found car based on your search
Fits your 733i
50
List price $83.69
-16% $69.94

In stock

Add to Cart

• 80 watts Peak Each, 40 watts RMS Each
• 1" Mylar Dome tweeters
• Polypropylene cone material
• Impedance: 4 ohm
• Sensitivity: 86.1 dB

MTX TERMINATOR5 with Sound Damping

140W Peak (70W RMS) 5.25" Terminator Series 2-way 4-ohm Coaxial Car Speakers + NVX SDBSK2 Premium Sound Damping

TERMINATOR5_SDBSK2 big
Go to item page Right Arrow Icon of Right Arrow

MTX TERMINATOR5 with Sound Damping

140W Peak (70W RMS) 5.25" Terminator Series 2-way 4-ohm Coaxial Car Speakers + NVX SDBSK2 Premium Sound Damping

• 70 watts Peak Each, 35 watts RMS Each
• Silk Dome tweeters
• Polypropylene cone material
• Impedance: 4 ohm
• Sensitivity: 85.3 dB

shipping truck icon Free shipping in USA. Provide zip for delivery date.
found car based on your search
Fits your 733i
47
List price $88.69
-16% $74.94

In stock

Add to Cart

• 70 watts Peak Each, 35 watts RMS Each
• Silk Dome tweeters
• Polypropylene cone material
• Impedance: 4 ohm
• Sensitivity: 85.3 dB

MTX TERMINATOR5 (2-Pairs, 4-Total)

280W Peak (140W RMS) 5.25" Terminator Series 2-Way Coaxial Car Speakers (2-Pairs)

TERMINATOR5_2 big
Go to item page Right Arrow Icon of Right Arrow

MTX TERMINATOR5 (2-Pairs, 4-Total)

280W Peak (140W RMS) 5.25" Terminator Series 2-Way Coaxial Car Speakers (2-Pairs)

• 70 watts Peak Each, 35 watts RMS Each
• 1" Silk Dome Tweeters
• Polypropylene cone material
• Impedance: 4 ohm
• Sensitivity: 85.3 dB

shipping truck icon Free shipping in USA. Provide zip for delivery date.
found car based on your search
Fits your 733i
List price $139.90
-14% $119.90

In stock

Only 2 Left!

Add to Cart

• 70 watts Peak Each, 35 watts RMS Each
• 1" Silk Dome Tweeters
• Polypropylene cone material
• Impedance: 4 ohm
• Sensitivity: 85.3 dB

MTX Audio THUNDER46 with Speaker Installation Kit

160W Peak (80W RMS) 4" x 6" Thunder Series 2-Way Coaxial Speakers with Speaker Baffles, Sound Dampening, Roller, and Panel Removal Kit

THUNDER46, FRING46, SDSK2, SDRLR1, BTK106 big
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MTX Audio THUNDER46 with Speaker Installation Kit

160W Peak (80W RMS) 4" x 6" Thunder Series 2-Way Coaxial Speakers with Speaker Baffles, Sound Dampening, Roller, and Panel Removal Kit

• Peak Power: 80W • RMS Power: 40W
• Concave Cone Design
• Mounting Depth: 2"
• Polypropylene Cone and Rubber Surround

Save 15% Off Package Deals at Checkout!
shipping truck icon Free shipping in USA. Provide zip for delivery date.
install icon

Install kits available for most vehicles

found car based on your search
Fits the following location in your 733i
  • Kick Panel
140
List price $172.66
-21% $135.78 /pair

Available

Ships in 10-14 days

Add to Cart

• Peak Power: 80W • RMS Power: 40W
• Concave Cone Design
• Mounting Depth: 2"
• Polypropylene Cone and Rubber Surround

MTX SS5 with Installation Accessories

250W RMS 5.25" 2-Way Component Speaker System with Speaker Baffles, Sound Damping, Roller, and Panel Removal Kit

SS5, XBAF525, SDSK2, SDRLR1, BTK106 big
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MTX SS5 with Installation Accessories

250W RMS 5.25" 2-Way Component Speaker System with Speaker Baffles, Sound Damping, Roller, and Panel Removal Kit

• 250 watts Peak Each, 125 watts RMS Each
• 1-3/16" Teteron Dome Tweeters
• Paper cone material
• Impedance: 4 ohm
• Sensitivity: 84 dB

Save 15% Off Package Deals at Checkout!
shipping truck icon Free shipping in USA. Provide zip for delivery date.
install icon

Install kits available for most vehicles

found car based on your search
Fits the following location in your 733i
  • Rear Deck Corner
148
$539.98 /set

Available

Ships in 10-14 days

Add to Cart

• 250 watts Peak Each, 125 watts RMS Each
• 1-3/16" Teteron Dome Tweeters
• Paper cone material
• Impedance: 4 ohm
• Sensitivity: 84 dB

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    Q: Can I upgrade or change the Speakers in 1981 BMW 733i?

    A: Yes this page includes all the best Speakers that work in your 733i.

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