Garage
Shop
Account Icon
Account
Box Icon
Track
order
Telephone Icon
Call
Help Icon
Help
Door with Arrow Icon
Sign In

1981 BMW 633CSi

Change vehicle | Remove vehicle

Single, 1-channel monoblock sub amplifiers for when you add a sub

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

Amplifiers for Powering a Sub for 1981 BMW 633CSi

Some vehicles require an amp bypass module, a line-output converter like the NVX XLCA2 or AudioControl LC2i, or a DSP to integrate with your factory radio and avoid bass roll-off. Bass roll-off occurs when a factory radio's crossover is designed only for the original equipment speakers, resulting in a not complete signal being sent to your new aftermarket amp.

Filters
Rockford Fosgate ✕
Clear Filters
Reset Done
Product Type
Price Range
Number of Channels
Each channel on an amplifier will power one speaker using a positive and negative cable. There are various types of amplifiers, each designed to power a certain number of speakers. Monoblock amplifiers, also known as single channel, are designed to power one or more subwoofers. These amplifiers often have very high power ratings. On the other hand, multi-channel amplifiers power multiple speakers, usually at lower power ratings. 2-Channel and 4-Channel amplifiers can power car speakers or low powered subwoofers. Occasionally you might see a 5 or 6-channel amplifier that can power speakers and subwoofers at the same time. The most common setup is a monoblock amp to run subwoofers and a 4-channel amp to run door speakers. Check out our Knowledge Base for more information.
Amplifier Key Features
Amplifiers can offer a diverse array of features. If you select more than one feature, then you will view amplifiers that have ALL features selected. These include speaker-level inputs that facilitate seamless integration with factory audio systems, Bluetooth connectivity suitable for ATV/UTV or Classic vehicle setups, built-in DSPs that provide enhanced control over your audio signal, and a host of other functionalities to explore.
Amplifier Class

An amplifier increases the power of the signal being fed to it by taking energy from its power supply and matching the signal but increasing its amplitude. Amplifiers use many different methods for converting these electrical signals and have been categorized into classes.

Class A/B: Greater than 50% of the input signal is amplified while the other percentage is “off”. These amplifiers have a small amount of current flowing through the output transistors all the time which almost eliminates crossover distortion. Class A/B has great sound quality but is not as efficient as class D. These amps are most commonly used to drive speakers.

Class D: Also known as switching amplifiers, class D amps have output transistors that are completely turned “on” or “off”. This means that when the transistors are on, there is almost no voltage across them but when they are off there is significant voltage but no current flowing through it which makes these amplifiers very efficient at the cost of sound quality. These amps are most commonly used to drive subwoofers.

Other Classes: You may see classes such as GH, bD, X, FD, etc. by some manufactures. These amplifiers tend to be either class A/B, D or a hybrid of the two but with improvements to their designs that can make them more efficient or offer better sound quality.
Total RMS Power Output
Total RMS power is measured by multiplying RMS power per channel by the number of channels, and is calculated at the lowest level of operating impedance.

RMS power is the amount of continuous power, measured in watts, that an amplifier produces is called RMS power. The higher the RMS figure, the louder and cleaner your music sounds.

The RMS output figure is much more accurate than the peak rating when comparing products.
Total Peak Power Output
The total peak power output is measured as the wattage per channel multiplied by the number of channels, and is calculated at the lowest level of operating impedance.

It is measured during a brief musical burst, such as a sudden drum accent. Some manufacturers display peak power ratings on the face of their products to increase the appeal.

The RMS power rating is more accurate, and we recommend using it for product comparison.
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.
Minimum Impedance Unbridged
The lowest impedance the amplifier will handle when it is not bridged.
Minimum Impedance Bridged
The lowest impedance the amplifier will handle when it is bridged.
Remote bass/level controller
If the amp comes with a bass/gain remote you will be able to control the level of your bass from your dashboard. Typically bass remotes also include a 16-20 ft. wire for installation.
Sonic Certified Amplifier
Sonic Certified amplifiers have been tested by the experts at Sonic Electronix to meet or exceed the wattage ratings provided by the manufacturer. If this is marked as Yes, then you can trust the wattage ratings. If marked as No, then we have tested the amplifier and it did not meet the advertised wattage ratings. If marked as Not Tested, then the Sonic Electronix experts have not yet been able to test the amp.
Preamp Outputs
Many amplifiers are equipped with RCA preamp outputs which pass the original music signal from the source to additional amplifiers. This is known as daisy chaining because the source connects to the first amp, and the first amp connects to the second amp, etc. The advantage to daisy chaining is you only need one 2-channel RCA cable to transfer the signal from the head-unit to the amplifier, and then one additional cable for each amp being daisy chained.
Built-in Crossover

A crossover is a type of filtering system that permits only certain frequencies to play. A Low-Pass (LP) crossover allows only frequencies below its setting to get through which is good in the case of some subwoofers. A High-Pass(HP) filter allows frequencies above its setting to pass through, this is normally used on speakers.

When a crossover is set to FULL it means no filtering is added and the full frequency spectrum is allowed through the amplifier. Filtering is important because feeding a speaker frequencies it cannot reproduce effectively creates distortion.

Amp Bluetooth Connectivity
This feature will tell you if the amplifier has the capability to connect to a Bluetooth device.
Deals
Promotions we have offer More Ways to Shop for items that are on clearance, last chance, special offer and sales, Made in America, and more!
Condition
Availability
filter-icon Filters & Sort

Rockford Fosgate Prime R2 R2-1200X1

1200W RMS Class D Prime Series Monoblock Car Amplifier

R2-1200X1 big
Go to item page Right Arrow Icon of Right Arrow

Rockford Fosgate Prime R2 R2-1200X1

1200W RMS Class D Prime Series Monoblock Car Amplifier

• 400 watts x 1 channel @ 4 ohm
• 800 watts x 1 channel @ 2 ohm
• Total RMS Power: 1200 watts
• Class D 1 ohm Stable Monoblock Amplifier

2+ offers available
shipping truck icon Free shipping in USA. Provide zip for delivery date.
VIP Star Icon

VIP Product Get $45.00 in rewards to spend later

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

23
$449.99

In stock

Add to Cart
Continue to cart
Available Offers (2) for Rockford Fosgate Prime R2 R2-1200X1
FREE NVX Amp Kit at Checkout!
Add both to cart
Save 30% on an NVX XKIT42 Amp Kit with Purchase! Add a qualifying amplifier to your cart and save 30% on the NVX XKIT42 Amp Kit! No code needed — discount applies automatically at checkout.
Select your other item
Used from: $382.49
See all 6 special offers

Rockford Fosgate R2-1200X1 with Amplifier Wiring Kit

Rockford Fosgate 1200W Monoblock Amplifier

R2-1200X1, XKIT42 big
Go to item page Right Arrow Icon of Right Arrow

Rockford Fosgate R2-1200X1 with Amplifier Wiring Kit

Rockford Fosgate 1200W Monoblock Amplifier

• 400 Watts RMS x 1 @ 4 ohm
• 800 Watts RMS x 1 @ 2 ohm
• 1200 Watts RMS x 1 @ 1 ohm
• CEA-2006 Compliant
• R.L.C. Remote Level Control
• Includes Amplifier Wiring Kit

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

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

148
List price $593.98
-15% $506.68

In stock

Add to Cart

• 400 Watts RMS x 1 @ 4 ohm
• 800 Watts RMS x 1 @ 2 ohm
• 1200 Watts RMS x 1 @ 1 ohm
• CEA-2006 Compliant
• R.L.C. Remote Level Control
• Includes Amplifier Wiring Kit

Rockford Fosgate Power T1000-1bdCP

1000W RMS Class BD Power Series Monoblock Car Amplifier

T1000-1bdCP big
Go to item page Right Arrow Icon of Right Arrow

Rockford Fosgate Power T1000-1bdCP

1000W RMS Class BD Power Series Monoblock Car Amplifier

• 700 watts x 1 channel @ 4 ohm
• 1000 watts x 1 channel @ 2 ohm
• 1000 watts x 1 channel @ 1 ohm
• Total RMS Power: 1000 watts
• Class BD 1 ohm Stable Monoblock Amplifier

2+ offers available
shipping truck icon Free shipping in USA. Provide zip for delivery date.
VIP Star Icon

VIP Product Get $66.00 in rewards to spend later

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

50
$659.99

In stock

Add to Cart
Continue to cart
Available Offers (2) for Rockford Fosgate Power T1000-1bdCP
FREE NVX Amp Kit at Checkout!
Add both to cart
Save 30% on an NVX XKIT42 Amp Kit with Purchase! Add a qualifying amplifier to your cart and save 30% on the NVX XKIT42 Amp Kit! No code needed — discount applies automatically at checkout.
Select your other item
Used from: $560.99
See all 7 special offers

Rockford Fosgate Prime R2 R2-500X1

500W RMS Class D Prime Series Monoblock Car Amplifier

R2-500X1 big
Go to item page Right Arrow Icon of Right Arrow

Rockford Fosgate Prime R2 R2-500X1

500W RMS Class D Prime Series Monoblock Car Amplifier

• 300 watts x 1 channel @ 4 ohm
• 500 watts x 1 channel @ 2 ohm
• Total RMS Power: 500 watts
• Class D 2 ohm Stable Monoblock Amplifier

2+ offers available
shipping truck icon Free shipping in USA. Provide zip for delivery date.
VIP Star Icon

VIP Product Get $31.00 in rewards to spend later

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

12
$309.99

In stock

Add to Cart
Continue to cart
Available Offers (2) for Rockford Fosgate Prime R2 R2-500X1
FREE Belva Amp Kit at Checkout!
Add both to cart
Save 30% on an NVX XKIT42 Amp Kit with Purchase! Add a qualifying amplifier to your cart and save 30% on the NVX XKIT42 Amp Kit! No code needed — discount applies automatically at checkout.
Select your other item
Used from: $263.49
See all 6 special offers

Rockford Fosgate R500X1D Amplifier + Free Belva BAK42BK 4 Gauge Amp Kit

R500X1D 500W RMS Prime Series Class D Monoblock Amplifier 4 Gauge Wiring Kit with 2-Channel RCA Interconnects

BAK42BK,R500X1D big
Go to item page Right Arrow Icon of Right Arrow

Rockford Fosgate R500X1D Amplifier + Free Belva BAK42BK 4 Gauge Amp Kit

R500X1D 500W RMS Prime Series Class D Monoblock Amplifier 4 Gauge Wiring Kit with 2-Channel RCA Interconnects

• R500X1D 500W RMS Prime Series Class D Monoblock Amplifier
• BAK42 Complete 4 Gauge Amplifier Wiring Kit with 2-Channel RCA Interconnects (CCA Wiring)

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

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

79
List price $369.98
-16% $309.99

In stock

Add to Cart

• R500X1D 500W RMS Prime Series Class D Monoblock Amplifier
• BAK42 Complete 4 Gauge Amplifier Wiring Kit with 2-Channel RCA Interconnects (CCA Wiring)

Rockford Fosgate R500X1D 500W RMS + 4 Gauge Amp Kit

500W RMS Prime Series Class D Monoblock Amplifier + 4 Gauge Full Spec CCA Amplifier Wiring Kit for Systems up to 650 Watts

BAK42,R500X1D big
Go to item page Right Arrow Icon of Right Arrow

Rockford Fosgate R500X1D 500W RMS + 4 Gauge Amp Kit

500W RMS Prime Series Class D Monoblock Amplifier + 4 Gauge Full Spec CCA Amplifier Wiring Kit for Systems up to 650 Watts

• RMS: 300W x 1 @ 4 ohm, 500W x 1 @ 2 ohm
• Total RMS Power: 500W
• CEA-2006 Compliant
• Remote PLC (Punch Level Control) Included
• Efficient Class-D circuit topology
• 4 Gauge Power Amplifier Installation Kit
• Ideal for Systems Up to 650 Watts
• Premium Power and Ground Wire Provides Optimal Power Transfer
• 2-Channel Twisted RCA Cables

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

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

72
List price $369.98
-16% $309.99

In stock

Only 1 Left!

Add to Cart

• RMS: 300W x 1 @ 4 ohm, 500W x 1 @ 2 ohm
• Total RMS Power: 500W
• CEA-2006 Compliant
• Remote PLC (Punch Level Control) Included
• Efficient Class-D circuit topology
• 4 Gauge Power Amplifier Installation Kit
• Ideal for Systems Up to 650 Watts
• Premium Power and Ground Wire Provides Optimal Power Transfer
• 2-Channel Twisted RCA Cables

Rockford Fosgate Power T750X1bd

750W RMS Class BD Power Series Monoblock Car Amplifier

T750X1bd big
Go to item page Right Arrow Icon of Right Arrow

Rockford Fosgate Power T750X1bd

750W RMS Class BD Power Series Monoblock Car Amplifier

• 500 watts x 1 channel @ 4 ohm
• 750 watts x 1 channel @ 2 ohm
• 750 watts x 1 channel @ 1 ohm
• Total RMS Power: 750 watts
• Class BD 1 ohm Stable Monoblock Amplifier

shipping truck icon Free shipping in USA. Provide zip for delivery date.
VIP Star Icon

VIP Product Get $55.00 in rewards to spend later

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

6
$549.99

In stock

Add to Cart
Used from: $467.49
See all 4 special offers

Rockford Fosgate Prime R2 R2-750X1

750W RMS Class D Prime Series Monoblock Car Amplifier

R2-750X1 big
Go to item page Right Arrow Icon of Right Arrow

Rockford Fosgate Prime R2 R2-750X1

750W RMS Class D Prime Series Monoblock Car Amplifier

• 250 watts x 1 channel @ 4 ohm
• 500 watts x 1 channel @ 2 ohm
• Total RMS Power: 750 watts
• Class D 1 ohm Stable Monoblock Amplifier

2+ offers available
shipping truck icon Free shipping in USA. Provide zip for delivery date.
VIP Star Icon

VIP Product Get $38.00 in rewards to spend later

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

6
$379.99

In stock

Add to Cart
Continue to cart
Available Offers (2) for Rockford Fosgate Prime R2 R2-750X1
FREE Belva Amp Kit at Checkout!
Add both to cart
Save 30% on an NVX XKIT42 Amp Kit with Purchase! Add a qualifying amplifier to your cart and save 30% on the NVX XKIT42 Amp Kit! No code needed — discount applies automatically at checkout.
Select your other item
Used from: $322.99
See all 6 special offers
Limited time!

Rockford Fosgate Punch P500X1BD

500W RMS Class BD Punch Series Monoblock Car Amplifier

P500X1BD big
Go to item page Right Arrow Icon of Right Arrow

Rockford Fosgate Punch P500X1BD

500W RMS Class BD Punch Series Monoblock Car Amplifier

• 150 watts x 1 channel @ 4 ohm
• 300 watts x 1 channel @ 2 ohm
• Total RMS Power: 500 watts
• Class BD 1 ohm Stable Monoblock Amplifier

shipping truck icon Free shipping in USA. Provide zip for delivery date.
VIP Star Icon

VIP Product Get $39.00 in rewards to spend later

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

14
List price $429.99
Save $40.00
-9% $389.99

In stock

Only 2 Left!

Add to Cart
Used from: $331.49
See all 6 special offers

Rockford Fosgate Power T500-1bdCP

500W RMS Class BD Power Series Monoblock Car Amplifier

T500-1bdCP big
Go to item page Right Arrow Icon of Right Arrow

Rockford Fosgate Power T500-1bdCP

500W RMS Class BD Power Series Monoblock Car Amplifier

• 300 watts x 1 channel @ 4 ohm
• 500 watts x 1 channel @ 2 ohm
• Total RMS Power: 500 watts
• Class BD 1 ohm Stable Monoblock Amplifier

2+ offers available
shipping truck icon Free shipping in USA. Provide zip for delivery date.
VIP Star Icon

VIP Product Get $55.00 in rewards to spend later

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

16
$549.99

Available

Ships in 10-14 days

Add to Cart
Continue to cart
Available Offers (2) for Rockford Fosgate Power T500-1bdCP
FREE NVX Amp Kit at Checkout!
Add both to cart
Save 30% on an NVX XKIT42 Amp Kit with Purchase! Add a qualifying amplifier to your cart and save 30% on the NVX XKIT42 Amp Kit! No code needed — discount applies automatically at checkout.
Select your other item
Used from: $467.49
See all 7 special offers
Limited time!

Rockford Fosgate Punch P300X1

300W RMS Class AB Punch Series Monoblock Car Amplifier

P300X1 big
Go to item page Right Arrow Icon of Right Arrow

Rockford Fosgate Punch P300X1

300W RMS Class AB Punch Series Monoblock Car Amplifier

• 200 watts x 1 channel @ 4 ohm
• 300 watts x 1 channel @ 2 ohm
• Total RMS Power: 300 watts
• Class A/B 2 ohm Stable Monoblock Amplifier

FREE Belva Amp Kit at Checkout! Shop deal
shipping truck icon Free shipping in USA. Provide zip for delivery date.
VIP Star Icon

VIP Product Get $25.00 in rewards to spend later

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

8
List price $279.99
Save $30.00
-11% $249.99

In stock

Add to Cart
Used from: $212.49
See all 6 special offers

Rockford Fosgate M5-1000X1

1000W Peak (750W RMS) Class BD M5 Series Monoblock Marine Amplifier

M5-1000X1 big
Go to item page Right Arrow Icon of Right Arrow

Rockford Fosgate M5-1000X1

1000W Peak (750W RMS) Class BD M5 Series Monoblock Marine Amplifier

• 500 watts x 1 channel @ 4 ohm
• 750 watts x 1 channel @ 2 ohm
• Total RMS Power: 750 watts
• Class BD 1 ohm Stable Monoblock Amplifier

shipping truck icon Free shipping in USA. Provide zip for delivery date.
VIP Star Icon

VIP Product Get $69.00 in rewards to spend later

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

$689.99

In stock

Add to Cart

Rockford Fosgate Prime R2 R2-250X1

250W RMS Class D Prime Series Monoblock Car Amplifier

R2-250X1 big
Go to item page Right Arrow Icon of Right Arrow

Rockford Fosgate Prime R2 R2-250X1

250W RMS Class D Prime Series Monoblock Car Amplifier

• 150 watts x 1 channel @ 4 ohm
• 250 watts x 1 channel @ 2 ohm
• Total RMS Power: 250 watts
• Class D 2 ohm Stable Monoblock Amplifier

2+ offers available
shipping truck icon Free shipping in USA. Provide zip for delivery date.
VIP Star Icon

VIP Product Get $25.00 in rewards to spend later

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

3
$249.99

In stock

Add to Cart
Continue to cart
Available Offers (2) for Rockford Fosgate Prime R2 R2-250X1
FREE Belva Amp Kit at Checkout!
Add both to cart
Save 30% on an NVX XKIT42 Amp Kit with Purchase! Add a qualifying amplifier to your cart and save 30% on the NVX XKIT42 Amp Kit! No code needed — discount applies automatically at checkout.
Select your other item
Used from: $212.49
See all 6 special offers

Rockford Fosgate Punch Marine PM100X1K

300W Peak (100W RMS) Punch Series BTL Monoblock Marine Amplifiers (Pair)

PM100X1K big
Go to item page Right Arrow Icon of Right Arrow

Rockford Fosgate Punch Marine PM100X1K

300W Peak (100W RMS) Punch Series BTL Monoblock Marine Amplifiers (Pair)

• 60 watts x 1 channel @ 4 ohm
• 100 watts x 1 channel @ 2 ohm
• Total RMS Power: 100 watts
• Class 2 ohm Stable Monoblock Amplifier

shipping truck icon Free shipping in USA. Provide zip for delivery date.
VIP Star Icon

VIP Product Get $31.00 in rewards to spend later

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

$309.99

In stock

Only 3 Left!

Add to Cart

• 60 watts x 1 channel @ 4 ohm
• 100 watts x 1 channel @ 2 ohm
• Total RMS Power: 100 watts
• Class 2 ohm Stable Monoblock Amplifier

Rockford Fosgate M2-500X1

500W RMS M2 Series Monoblock Marine Amplifier with Remote Bass Knob

M2-500X1 big
Go to item page Right Arrow Icon of Right Arrow

Rockford Fosgate M2-500X1

500W RMS M2 Series Monoblock Marine Amplifier with Remote Bass Knob

• 300 watts x 1 channel @ 4 ohm
• 500 watts x 1 channel @ 2 ohm
• Total RMS Power: 500 watts
• Class D 2 ohm Stable Monoblock Amplifier

shipping truck icon Free shipping in USA. Provide zip for delivery date.
VIP Star Icon

VIP Product Get $35.00 in rewards to spend later

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

$349.99

In stock

Only 3 Left!

Add to Cart

• 300 watts x 1 channel @ 4 ohm
• 500 watts x 1 channel @ 2 ohm
• Total RMS Power: 500 watts
• Class D 2 ohm Stable Monoblock Amplifier

Rockford Fosgate R500X1D 500 Watt Car Amplifier + Amp Wiring Kit Bundle

R500X1D 500W RMS Prime Series Class D Monoblock Amplifier + BAK42 Complete CCA 4 Gauge Amplifier Wiring Kit with 2-Channel RCA Interconnects

BAK42BK,R500X1D big
Go to item page Right Arrow Icon of Right Arrow

Rockford Fosgate R500X1D 500 Watt Car Amplifier + Amp Wiring Kit Bundle

R500X1D 500W RMS Prime Series Class D Monoblock Amplifier + BAK42 Complete CCA 4 Gauge Amplifier Wiring Kit with 2-Channel RCA Interconnects

• R500X1D 500W RMS Prime Series Class D Monoblock Amplifier
• BAK42 Complete 4 Gauge Amplifier Wiring Kit with 2-Channel RCA Interconnects (CCA Wiring)

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

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

75
List price $369.98
-7% $344.98

In stock

Add to Cart

• R500X1D 500W RMS Prime Series Class D Monoblock Amplifier
• BAK42 Complete 4 Gauge Amplifier Wiring Kit with 2-Channel RCA Interconnects (CCA Wiring)

Rockford Fosgate Punch Marine PM500X1bd

500W RMS Class BD Punch Series Monoblock Marine Amplifier

PM500X1bd big
Go to item page Right Arrow Icon of Right Arrow

Rockford Fosgate Punch Marine PM500X1bd

500W RMS Class BD Punch Series Monoblock Marine Amplifier

• 150 watts x 1 channel @ 4 ohm
• 300 watts x 1 channel @ 2 ohm
• 500 watts x 1 channel @ 1 ohm
• Total RMS Power: 500 watts
• Class BD 1 ohm Stable Monoblock Amplifier

shipping truck icon Free shipping in USA. Provide zip for delivery date.
VIP Star Icon

VIP Product Get $55.00 in rewards to spend later

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

$549.99

Available

Ships in 10-14 days

Add to Cart

• 150 watts x 1 channel @ 4 ohm
• 300 watts x 1 channel @ 2 ohm
• 500 watts x 1 channel @ 1 ohm
• Total RMS Power: 500 watts
• Class BD 1 ohm Stable Monoblock Amplifier

Rockford Fosgate Punch Marine PM1000X1bd

1000W RMS Class BD Punch Series Monoblock Marine Amplifier

PM1000X1bd big
Go to item page Right Arrow Icon of Right Arrow

Rockford Fosgate Punch Marine PM1000X1bd

1000W RMS Class BD Punch Series Monoblock Marine Amplifier

• 300 watts x 1 channel @ 4 ohm
• 500 watts x 1 channel @ 2 ohm
• Total RMS Power: 1000 watts
• Class BD 1 ohm Stable Monoblock Amplifier

shipping truck icon Free shipping in USA. Provide zip for delivery date.
VIP Star Icon

VIP Product Get $69.00 in rewards to spend later

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

$689.99

Available

Ships in 10-14 days

Add to Cart

• 300 watts x 1 channel @ 4 ohm
• 500 watts x 1 channel @ 2 ohm
• Total RMS Power: 1000 watts
• Class BD 1 ohm Stable Monoblock Amplifier

Rockford Fosgate Prime R2-1200X1 (Open Box, Great)

1200W RMS Class D Prime Series Monoblock Car Amplifier

R2-1200X1 big
Go to item page Right Arrow Icon of Right Arrow

Rockford Fosgate Prime R2-1200X1 (Open Box, Great)

1200W RMS Class D Prime Series Monoblock Car Amplifier

• 400 watts x 1 channel @ 4 ohm
• 800 watts x 1 channel @ 2 ohm
• 1200 watts x 1 channel @ 1 ohm
• Total RMS Power: 1200 watts
• Class D 1 ohm Stable Monoblock Amplifier

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

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

24
List price $449.99
-15% $382.49

In stock

Add to Cart
Lowest price in 30 days

Rockford Fosgate Punch P500X1BD + FREE $50 Gift Card

500W RMS Punch Series Monoblock Class BD Car Power Amplifier

P500X1BD, 50EGIFT big
Go to item page Right Arrow Icon of Right Arrow

Rockford Fosgate Punch P500X1BD + FREE $50 Gift Card

500W RMS Punch Series Monoblock Class BD Car Power Amplifier

• RMS: 150W x 1 @ 4 ohm, 300W x 1 @ 2 ohm, 500W x 1 @ 1 ohm
• Total RMS Power: 500W
• CEA-2006 Compliant
• Tuned Bass EQ: 0 to +18 dB
• Super Efficient Class BD Circuitry
• Dimensions: 11"L x 7-3/4"W x 2-3/8"H

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

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

28
List price $479.99
-19% $389.99

In stock

Only 2 Left!

Add to Cart

• RMS: 150W x 1 @ 4 ohm, 300W x 1 @ 2 ohm, 500W x 1 @ 1 ohm
• Total RMS Power: 500W
• CEA-2006 Compliant
• Tuned Bass EQ: 0 to +18 dB
• Super Efficient Class BD Circuitry
• Dimensions: 11"L x 7-3/4"W x 2-3/8"H

1 2 3 4 Next

Items per page: 20 40 60

    Clear all
    why-shoping-with-sonic

    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!
    Why Shop With Us?
    FAQ for Monoblock Sub Amplifiers in 1981 633CSi

    Q: Can I upgrade or change the Monoblock Sub Amplifiers in 1981 BMW 633CSi?

    A: Yes this page includes all the best Monoblock Sub Amplifiers that work in your 633CSi.

    Save up to 10 different vehicles in your garage
    Vehicle
    Store     Delete

    1981 BMW 633CSi

    2021 Subaru Ascent

    2020 Subaru Forester

    2004 Ford Focus

    1990 Ford Aerostar

    2000 GMC Yukon Denali

    1982 Dodge B150

    2012 Ford F-150

    1992 Toyota Pickup

    2018 Kia Niro

    Add vehicle Clear all vehicles
    Where to find vehicle info
    Are you sure you want to clear your garage?
    This action cannot be undone. Confirm

    Cancel

    This category was not designed for products.
    If you continue, you will be redirected to a category customized for your vehicle. Continue

    Cancel

    Shop your 1981 633CSi
    Why Use a Vehicle Fit Guide?
    Change vehicle | Shop without vehicle
    Whoa! Slow down. Add your details below!
    additional information required
    Add vehicle details to confirm fitment
    Ignore fitment details
    Find stereos and more that work -- fast.
    Remove

    Can't find your vehicle? Click here and we'll help.

    Where to find vehicle info

    Go to Fitment

    Didn't find your car?

    Submit your details and we'll help!
    Please enter the letters as they are shown in the image above. Letters are not case-sensitive.
    Identify your vehicle and submodel details
    • Owner's manual
    • Vehicle's insurance card
    • Vehicle registration
    • Vehicle produced after 2005: Inside driver's side door
    • Vehicle produced before 2005: Rear passenger doorjamb, glove box, center console, or engine compartment
    Car Info Side Door Icon
    Vehicle Registration Icon
    Vehicle Insurance Icon
    Back

    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.

    Back
    Track your order
    Call our experts
    Support Center
    Return & Exchanges
    Follow on Instagram Instagram logo
    Subscribe on YouTube YouTube logo