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

1998 Audi A4

Change vehicle | Remove vehicle

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 1998 Audi A4

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.

Filters
Amplifiers ✕
Clear Filters
Reset Done
Product Type
Amplifiers,
You Recently Chose:
Batteries (129)
Power and ground wire (128)
Subwoofer (3)
Subwoofers (1,137)
Amplifiers (927)
Subwoofers with a box (784)
Amplifiers with a wiring kit (439)
RCA cables and accessories (263)
Subwoofer enclosures (213)
Subwoofers with an amplifier and box (187)
Lighting accessories (175)
Subwoofer grilles (169)
Tweeters (Pro and special-fit) (147)
Speaker clamps and brackets (139)
Amplifier wiring kits (135)
Fuses (123)
Speaker grilles (120)
Backup cameras (118)
Sound damping (104)
Subwoofers with an amplifier (101)
Handlebar and bar-mount speakers (97)
Alarm remote transmitters (96)
Line-out converters (88)
Fuse holders (81)
Speaker wire (73)
Replacement antennas (63)
Ring terminals (63)
Distribution blocks (58)
Light bars (58)
Connectors (57)
Speaker baffles (53)
Tweeters (53)
Speaker enclosures (52)
Bass remotes (50)
Speaker spacers and rings (50)
Bluetooth adapters and transmitters (48)
Cables and interconnects (48)
Sound processors (39)
Trim rings and universal mounts (39)
Alarms (34)
Dash cameras (33)
Recone kits (32)
Stereo remote controls (32)
Rocker and Button switches (31)
Circuit breakers (30)
Primary/Remote wire (29)
Battery isolators and relays (27)
Audio test equipment (26)
Battery terminals (26)
Exterior lighting (26)
Installation accessories (25)
Trigger output and bypass modules (24)
Alarm accessories (23)
Antenna extension cables (23)
Split loom and heat shrink (22)
Diodes and resistors (21)
Capacitors (19)
Knockout panels (18)
Equalizers (16)
Noise filters (15)
Terminal cups (14)
Battery terminal posts (13)
Rearview monitor and mirrors (13)
Adapters (12)
Radar and laser detectors (11)
Video adapters and switchers (11)
Speaker diaphragms (10)
Bass booster enhancers and processors (9)
Headlight bulbs (9)
Battery chargers (8)
Power inverters (8)
2-way and CB radios (7)
Amplifier mounting hardware (7)
Panel and clip removal tools (7)
Voltmeters (7)
Blindspot cameras and sensors (6)
Gauge adapters (6)
Grommets and firewall bushings (6)
Headlights (6)
Sensors (6)
Box ports (5)
Carpet (5)
Knockout panel mount hardware (5)
Line drivers (5)
Passive crossovers (5)
Power supplies (5)
Steering wheel adapters (5)
Active Crossovers (4)
Bass Blockers (4)
License plates and frames (4)
Parking sensors (4)
Amplifier cooling fans (3)
Door panel clips (3)
Big 3 upgrade kits (2)
Door actuators and poppers (2)
In-motion video/navigation bypass (2)
Radar detector mounts (2)
Rearview mirror mounts (2)
Video amplifiers (2)
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
Product Fitment Type
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.
Punch Series (38)
Power Series (28)
Machete Series (22)
FRP Series (21)
XDM Series (21)
Prime Series (17)
CVP Series (15)
V Series (15)
Hydro Series (14)
SXE Series (13)
VXi Series (13)
RD Series (12)
Apocalypse Atom Pro Series (11)
Reference Series (11)
SALT Series (11)
SMD Series (11)
JD Series (10)
SAE Series (10)
Brutus BRL Series (9)
CX Series (9)
Gen-X (9)
Ground Pounder Series (9)
MVi Series (9)
Nautic Series (9)
Brutus BG Series (8)
BX Series (8)
Elite Series (8)
Epic Series (8)
Godfather Series (8)
HD Series (8)
Hooligan Series (8)
MA Series (8)
Stroker RPM Series (8)
Thunder Series (8)
V-Drive Series (8)
XED Series (8)
Competition Series (7)
CRA Series (7)
HEX Series (7)
iON Series (7)
KXM Series (7)
LX Series (7)
MX Series (7)
Power Pack Series (7)
Apocalypse Sport Series (6)
Club Series (6)
eXcelon Series (6)
HED Series (6)
JA Series (6)
M2 Series (6)
MUD Series (6)
R-Series (6)
SFB Series (6)
SIA Series (6)
Venezia Series (6)
ZR Series (6)
ACX Series (5)
Diamond Elite Series (5)
DMD Series (5)
Formula Series (5)
HCP Series (5)
KM Series (5)
Marine V Series (5)
Mean Machine Series (5)
Mini Series (5)
Premium Pro Series (5)
PXA Series (5)
SAM Series (5)
Stealth Bomber Series (5)
Stroker Series (5)
SYN-DX Series (5)
Terminator Series (5)
VEGA Series (5)
XC-Series (5)
XQ Series (5)
Altitude Series (4)
AP Series (4)
COLOSSUS Mini Series (4)
Discus Series (4)
DSP Series (4)
DXM Series (4)
Excelon Reference Series (4)
GM Series (4)
HTM Series (4)
M Series (4)
Marine Series (4)
Micro Series (4)
N-Series (4)
PS Series (4)
RS Series (4)
S Series (4)
Sinister Series (4)
Status Series (4)
Stroker Pro Series (4)
X Series (4)
Apex Series (3)
COLOSSUS Series (3)
Compact Mean Machine Series (3)
D Series (3)
DRVN Series (3)
Excelon Motorsports Series (3)
HRPM Series (3)
HXM Series (3)
LC Series (3)
M5 Series (3)
MDX Series (3)
MHD Series (3)
MicroV2 Series (3)
N Series (3)
NXL Series (3)
Rebel Series (3)
SPL Show Series (3)
Stage GT Series (3)
Stealth STX Series (3)
Trident Series (3)
VFL Comp Series (3)
VFL Stealth Series (3)
Zeus Series (3)
Alpha Series (2)
Apocalypse Series (2)
BB Series (2)
Buran Series (2)
DB Series (2)
Edge Series (2)
EV Series (2)
EXL-P Series (2)
FX Series (2)
HCCA Series (2)
HMP Series (2)
Kappa Perfect Series (2)
Key Series (2)
KPX Series (2)
Micro8U Series (2)
MINI BANG Series (2)
MotorSport Series (2)
Picasso-Nano Series (2)
PowerHouse Shredder Series (2)
Primo Series (2)
Primus Series (2)
Q-Series (2)
QS Series (2)
RTX Series (2)
Signature Series (2)
Stealth Mini Series (2)
VFL Rebel Series (2)
VFL Series (2)
Warhorse Series (2)
XFL Series (2)
ACM Series (1)
Atom Series (1)
Bomber Series (1)
Colossus Classic Series (1)
CVPM Series (1)
CVPRO Series (1)
DC Series (1)
DPower Series (1)
DS Series (1)
EXL Series (1)
GM Digital Series (1)
GT Series (1)
HMS Series (1)
HTX Series (1)
Mille Pro Series (1)
MOJO Pro Series (1)
PowerZone 2 Series (1)
Punch BR Series (1)
PXE Series (1)
Reserve Series (1)
SAEv4 Series (1)
Smash Series (1)
SPL (1)
SPX Series (1)
Street Reference (1)
WET Series (1)
ZXI Series (1)
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

JL Audio RD900/5

900W RMS Class D RD Series 5 Channel Car Amplifier

RD900/5 big
Go to item page Right Arrow Icon of Right Arrow

JL Audio RD900/5

900W RMS Class D RD Series 5 Channel Car Amplifier

• 70 watts x 4 channel + 225 watts x 1 channel @ 4 ohm
• 100 watts x 4 channel + 500 watts x 1 channel @ 2 ohm
• Bridged: 200 watts x 2 channel @ 4 ohm + 500 watts x 1 channel @ 2 ohm
• Total RMS Power: 900 watts
• Class D 2 ohm Stable 5-Channel Amplifier

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

VIP Product Get $68.00 in rewards to spend later

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

4
$679.99

In stock

Add to Cart
Continue to cart
Available Offers (2) for JL Audio RD900/5
FREE NVX Amp Kit at Checkout!
Add both to cart
Save 30% off an NVX XKIT46 Amp Kit at Checkout! Add a qualifying amplifier to your cart and save 30% on the NVX XKIT46 Amp Kit! No code needed — discount applies automatically at checkout.
Select your other item
Used from: $577.99
Limited time!

Crunch GP-1500.4

1500W RMS Class AB Ground Pounder Series 4 Channel Car Amplifier

GP-1500.4 big
Go to item page Right Arrow Icon of Right Arrow

Crunch GP-1500.4

1500W RMS Class AB Ground Pounder Series 4 Channel Car Amplifier

• 185 watts x 4 channel @ 4 ohm
• 375 watts x 4 channel @ 2 ohm
• Bridged: 750 watts x 2 channel @ 4 ohm
• Total RMS Power: 1500 watts
• Class A/B 2 ohm Stable 4-Channel Amplifier

Save 30% off an NVX XKIT44 Amp Kit 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

5
List price $139.99
-48% $72.99

In stock

Add to Cart
Available Deal
GP-1500.4 main
Offer may end without notice
Continue Shopping Continue to checkout
Eligible items

Shop items below for 30% off up to $100 discount on Save 30% off an NVX Amp Kit!

NVX XKIT44

NVX XKIT44

$119.99

$83.99

$36 Savings!

Add to cart

• 185 watts x 4 channel @ 4 ohm
• 375 watts x 4 channel @ 2 ohm
• Bridged: 750 watts x 2 channel @ 4 ohm
• Total RMS Power: 1500 watts
• Class A/B 2 ohm Stable 4-Channel Amplifier

Limited time!

Rockford Fosgate Punch P300X2

300W RMS Class AB Punch Series 2 Channel Car Amplifier

P300X2 big
Go to item page Right Arrow Icon of Right Arrow

Rockford Fosgate Punch P300X2

300W RMS Class AB Punch Series 2 Channel Car Amplifier

• 100 watts x 2 channel @ 4 ohm
• 150 watts x 2 channel @ 2 ohm
• Bridged: 300 watts x 1 channel @ 4 ohm
• Total RMS Power: 300 watts
• Class A/B 2 ohm Stable 2-Channel Amplifier

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

9
List price $279.99
Save $30.00
-11% $249.99

In stock

Only 2 Left!

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

Kenwood eXcelon X803-5

1600W Peak (800W RMS) Class D eXcelon Series 5 Channel Car Amplifier with Bass Remote

X803-5 big
Go to item page Right Arrow Icon of Right Arrow

Kenwood eXcelon X803-5

1600W Peak (800W RMS) Class D eXcelon Series 5 Channel Car Amplifier with Bass Remote

• 50 watts x 4 channel + 300 watts x 1 channel @ 4 ohm
• 75 watts x 4 channel + 500 watts x 1 channel @ 2 ohm
• Bridged: 150 watts x 2 channel @ 4 ohm + 500 watts x 1 channel @ 2 ohm
• Total RMS Power: 800 watts
• Class D 2 ohm Stable 5-Channel Amplifier

2+ offers available
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

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

1
List price $600.00
-17% $499.99

In stock

Add to Cart
Continue to cart
Available Offers (2) for Kenwood eXcelon X803-5
FREE NVX Amp Kit at Checkout!
Add both to cart
Save 30% off an NVX XKIT46 Amp Kit at Checkout! Add a qualifying amplifier to your cart and save 30% on the NVX XKIT46 Amp Kit! No code needed — discount applies automatically at checkout.
Select your other item
Used from: $349.99
Limited time!

Pioneer GM-DX871

1600W Peak (800W RMS) Class D GM Series Monoblock Car Amplifier with Remote Bass

GM-DX871 big
Go to item page Right Arrow Icon of Right Arrow

Pioneer GM-DX871

1600W Peak (800W RMS) Class D GM Series Monoblock Car Amplifier with Remote Bass

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

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

VIP Product Get $20.00 in rewards to spend later

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

7
List price $270.00
Save $70.00
-26% $200.00

In stock

Add to Cart
See all 4 special offers

AudioControl EPIC1500

1500W RMS Class D Epic Series Monoblock Car Amplifier with Bass Remote

EPIC1500 big
Go to item page Right Arrow Icon of Right Arrow

AudioControl EPIC1500

1500W RMS Class D Epic Series Monoblock Car Amplifier with Bass Remote

• 600 watts x 1 channel @ 4 ohm
• 1000 watts x 1 channel @ 2 ohm
• 1500 watts x 1 channel @ 1 ohm
• Bridged (Strapped): 3000 watts x 1 channel @ 2 ohm
• Total RMS Power: 1500 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 $25.90 in rewards to spend later

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

2
$259.00

In stock

Add to Cart
Continue to cart
Available Offers (2) for AudioControl EPIC1500
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

• 600 watts x 1 channel @ 4 ohm
• 1000 watts x 1 channel @ 2 ohm
• 1500 watts x 1 channel @ 1 ohm
• Bridged (Strapped): 3000 watts x 1 channel @ 2 ohm
• Total RMS Power: 1500 watts
• Class D 1 ohm Stable Monoblock Amplifier

Sundown Audio SIA-5000D

5000W RMS Class D SIA Series Monoblock Car Amplifier

SIA-5000D big
Go to item page Right Arrow Icon of Right Arrow

Sundown Audio SIA-5000D

5000W RMS Class D SIA Series Monoblock Car Amplifier

• 3400 watts x 1 channel @ 4 ohm
• 4950 watts x 1 channel @ 2 ohm
• 5000 watts x 1 channel @ 1 ohm
• Total RMS Power: 5000 watts
• Class D 1 ohm Stable Monoblock Amplifier

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

VIP Product Get $67.50 in rewards to spend later

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

3
List price $809.99
-17% $674.99

In stock

Add to Cart

Kicker LX1200.5 (51LX12005)

1500W Peak (1200W RMS) Class D LX Series 5-Channel Full Range Car Amplifier (with Bass Remote and Control Center)

51LX12005 big
Go to item page Right Arrow Icon of Right Arrow

Kicker LX1200.5 (51LX12005)

1500W Peak (1200W RMS) Class D LX Series 5-Channel Full Range Car Amplifier (with Bass Remote and Control Center)

• 125 watts x 4 channel + 300 watts x 1 channel @ 4 ohm
• 175 watts x 4 channel + 550 watts x 1 channel @ 2 ohm
• 700 watts x 1 channel @ 1 ohm
• Bridged: 350 watts x 2 channel @ 4 ohm + 550 watts x 1 channel @ 2 ohm
• Total RMS Power: 1200 watts
• Class D 1 ohm Stable 5-Channel Amplifier

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

VIP Product Get $85.00 in rewards to spend later

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

1
List price $949.99
-11% $849.99

In stock

Add to Cart
Continue to cart
Available Offers (2) for Kicker LX1200.5 (51LX12005)
FREE Belva Amp Kit at Checkout!
Add both to cart
Save 30% off an NVX XKIT06 Amp Kit at Checkout! Add a qualifying amplifier to your cart and save 30% on the NVX XKIT06 Amp Kit! No code needed — discount applies automatically at checkout.
Select your other item

AudioControl EPICBIGFOUR

1400W RMS Class D Epic Series 4-Channel Car Amplifier

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

AudioControl EPICBIGFOUR

1400W RMS Class D Epic Series 4-Channel Car Amplifier

• 200 watts x 4 channel @ 4 ohm
• 350 watts x 4 channel @ 2 ohm
• Bridged: 650 watts x 2 channel @ 4 ohm
• Total RMS Power: 1400 watts
• Class D 2 ohm Stable 4-Channel Amplifier

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

VIP Product Get $23.90 in rewards to spend later

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

1
$239.00

In stock

Add to Cart
Continue to cart
Available Offers (2) for AudioControl EPICBIGFOUR
FREE Belva Amp Kit at Checkout!
Add both to cart
Save 30% off an NVX XKIT44 Amp Kit at Checkout! Add a qualifying amplifier to your cart and save 30% on the NVX XKIT44 Amp Kit! No code needed — discount applies automatically at checkout.
Select your other item

Alpine S2-A36F

360W RMS Class D S-Series 4 Channel Car Amplifier

S2-A36F big
Go to item page Right Arrow Icon of Right Arrow

Alpine S2-A36F

360W RMS Class D S-Series 4 Channel Car Amplifier

• 60 watts x 4 channel @ 4 ohm
• 90 watts x 4 channel @ 2 ohm
• Bridged: 180 watts x 2 channel @ 4 ohm
• Total RMS Power: 360 watts
• Class D 2 ohm Stable 4-Channel Amplifier

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

VIP Product Get $30.00 in rewards to spend later

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

3
List price $360.00
-17% $299.95

In stock

Add to Cart
Continue to cart
Available Offers (2) for Alpine S2-A36F
FREE Belva Amp Kit at Checkout!
Add both to cart
Save 30% off an NVX XKIT84 Amp Kit at Checkout! Add a qualifying amplifier to your cart and save 30% on the NVX XKIT84 Amp Kit! No code needed — discount applies automatically at checkout.
Select your other item
Limited time!

Deaf Bonce MFA 4.320

1920W RMS Class D Machete Series 4 Channel Car Amplifier

MFA 4.320 big
Go to item page Right Arrow Icon of Right Arrow

Deaf Bonce MFA 4.320

1920W RMS Class D Machete Series 4 Channel Car Amplifier

• 320 watts x 4 channel @ 4 ohm
• 480 watts x 4 channel @ 2 ohm
• Bridged: 960 watts x 2 channel @ 4 ohm
• Total RMS Power: 1920 watts
• Class D 2 ohm Stable 4-Channel Amplifier

Save 30% off an NVX XKIT44 Amp Kit at Checkout!
shipping truck icon Free shipping in USA. Provide zip for delivery date.
VIP Star Icon

VIP Product Get $31.99 in rewards to spend later

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

$319.90

In stock

Add to Cart
Available Deal
MFA 4.320 main
Offer may end without notice
Continue Shopping Continue to checkout
Eligible items

Shop items below for 30% off up to $100 discount on Save 30% off an NVX Amp Kit!

NVX XKIT44

NVX XKIT44

$119.99

$83.99

$36 Savings!

Add to cart

JL Audio HD750/1

750W RMS Class D HD Series Monoblock Car Amplifier

HD750/1 big
Go to item page Right Arrow Icon of Right Arrow

JL Audio HD750/1

750W RMS Class D HD Series Monoblock Car Amplifier

• 750 watts x 1 channel @ 4 ohm
• 750 watts x 1 channel @ 2 ohm
• Total RMS Power: 750 watts
• Class D 1.5 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 $105.00 in rewards to spend later

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

10
$1,049.99

In stock

Add to Cart
Continue to cart
Available Offers (2) for JL Audio HD750/1
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: $837.37
See all 5 special offers

Sundown Audio SAEv4-150.4 (Like New (Open Box))

900W RMS Class AB SAE Series 4-Channel Car Amplifier (SAEv.4-150.4)

SAEv4-150.4 big
Go to item page Right Arrow Icon of Right Arrow

Sundown Audio SAEv4-150.4 (Like New (Open Box))

900W RMS Class AB SAE Series 4-Channel Car Amplifier (SAEv.4-150.4)

• 150 watts x 4 channel @ 4 ohm
• 225 watts x 4 channel @ 2 ohm
• Bridged: 450 watts x 2 channel @ 4 ohm
• Total RMS Power: 900 watts
• Class A/B 2 ohm Stable 4-Channel 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

List price $563.99
-29% $399.49

In stock

Only 1 Left!

Add to Cart

• 150 watts x 4 channel @ 4 ohm
• 225 watts x 4 channel @ 2 ohm
• Bridged: 450 watts x 2 channel @ 4 ohm
• Total RMS Power: 900 watts
• Class A/B 2 ohm Stable 4-Channel Amplifier

Limited time!

NVX XQA25001

2500W RMS Class D XQ-Series Monoblock Car Amplifier with X-Boost

XQA25001 big
Go to item page Right Arrow Icon of Right Arrow

NVX XQA25001

2500W RMS Class D XQ-Series Monoblock Car Amplifier with X-Boost

• 1000 watts x 1 channel @ 4 ohm
• 1500 watts x 1 channel @ 2 ohm
• 2500 watts x 1 channel @ 1 ohm
• Total RMS Power: 2500 watts
• Class D 1 ohm Stable Monoblock Amplifier

Save 30% off an NVX XKIT02 Amp Kit 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

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

1
List price $839.99
-40% $499.99

In stock

Add to Cart
Available Deal
XQA25001 main
Offer may end without notice
Continue Shopping Continue to checkout
Eligible items

Shop items below for 30% off up to $100 discount on Save 30% off an NVX Amp Kit!

NVX XKIT02

NVX XKIT02

$179.99

$125.99

$54 Savings!

Add to cart

Alpine KTP-445A Power Pack

180W RMS Class D Power Pack Series 4 Channel Car Amplifier

KTP-445A big
Go to item page Right Arrow Icon of Right Arrow

Alpine KTP-445A Power Pack

180W RMS Class D Power Pack Series 4 Channel Car Amplifier

• 45 watts x 4 channel @ 4 ohm
• Total RMS Power: 180 watts
• Class D 2 ohm Stable 4-Channel Amplifier

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

VIP Product Get $33.00 in rewards to spend later

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

10
List price $400.00
-18% $329.95

In stock

Add to Cart

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!

AudioControl EPIC2000

2000W RMS Class D Epic Series Monoblock Car Amplifier with Bass Remote

EPIC2000 big
Go to item page Right Arrow Icon of Right Arrow

AudioControl EPIC2000

2000W RMS Class D Epic Series Monoblock Car Amplifier with Bass Remote

• 800 watts x 1 channel @ 4 ohm
• 1400 watts x 1 channel @ 2 ohm
• 2000 watts x 1 channel @ 1 ohm
• Bridged (Strapped): 4000 watts x 1 channel @ 2 ohm
• Total RMS Power: 2000 watts
• Class D 1 ohm Stable Monoblock Amplifier

Save 30% off an NVX XKIT02 Amp Kit at Checkout!
shipping truck icon Free shipping in USA. Provide zip for delivery date.
VIP Star Icon

VIP Product Get $34.90 in rewards to spend later

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

$349.00

In stock

Only 3 Left!

Add to Cart
Available Deal
EPIC2000 main
Offer may end without notice
Continue Shopping Continue to checkout
Eligible items

Shop items below for 30% off up to $100 discount on Save 30% off an NVX Amp Kit!

NVX XKIT02

NVX XKIT02

$179.99

$125.99

$54 Savings!

Add to cart
See all 6 special offers

American Bass VFL REBEL 1400.4

1420W RMS Class D VFL Rebel Series 4-Channel Car and Motorcycle Amplifier

VFL REBEL 1400.4 big
Go to item page Right Arrow Icon of Right Arrow

American Bass VFL REBEL 1400.4

1420W RMS Class D VFL Rebel Series 4-Channel Car and Motorcycle Amplifier

• 220 watts x 4 channel @ 4 ohm
• 355 watts x 4 channel @ 2 ohm
• Bridged: 700 watts x 2 channel @ 4 ohm
• Total RMS Power: 1420 watts
• Class D 2 ohm Stable 4-Channel Amplifier

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

VIP Product Get $35.90 in rewards to spend later

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

List price $399.00
-10% $359.00

In stock

Only 2 Left!

Add to Cart
Continue to cart
Available Offers (2) for American Bass VFL REBEL 1400.4
FREE Belva Amp Kit at Checkout!
Add both to cart
Save 30% off an NVX XKIT44 Amp Kit at Checkout! Add a qualifying amplifier to your cart and save 30% on the NVX XKIT44 Amp Kit! No code needed — discount applies automatically at checkout.
Select your other item

Alpine R-A90S

900W RMS Class D R Series 6 Channel Car Amplifier

R-A90S big
Go to item page Right Arrow Icon of Right Arrow

Alpine R-A90S

900W RMS Class D R Series 6 Channel Car Amplifier

• 75 watts x 4 channel + 150 watts x 2 channel @ 4 ohm
• 100 watts x 4 channel + 250 watts x 2 channel @ 2 ohm
• Bridged: 200 watts x 2 channel @ 4 ohm + 500 watts x 1 channel @ 4 ohm
• Total RMS Power: 900 watts
• Class D 2 ohm Stable 6-Channel Amplifier

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

VIP Product Get $70.00 in rewards to spend later

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

1
List price $840.00
-17% $699.95

In stock

Only 1 Left!

Add to Cart
Continue to cart
Available Offers (2) for Alpine R-A90S
FREE NVX Amp Kit at Checkout!
Add both to cart
Save 30% off an NVX XKIT46 Amp Kit at Checkout! Add a qualifying amplifier to your cart and save 30% on the NVX XKIT46 Amp Kit! No code needed — discount applies automatically at checkout.
Select your other item
Used from: $594.96

Alpine R2-A150M

1500W RMS Class D R-Series Monoblock Car Amplifier

R2-A150M big
Go to item page Right Arrow Icon of Right Arrow

Alpine R2-A150M

1500W RMS Class D R-Series Monoblock Car Amplifier

• 700 watts x 1 channel @ 4 ohm
• 1200 watts x 1 channel @ 2 ohm
• Total RMS Power: 1500 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 $70.00 in rewards to spend later

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

6
List price $840.00
-17% $699.95

In stock

Add to Cart
Continue to cart
Available Offers (2) for Alpine R2-A150M
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
See all 4 special offers
Prev 3 4 5 6 7 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 Universal-Fit Audio & Electronics in 1998 A4

    Q: Can I upgrade or change the Universal-Fit Audio & Electronics in 1998 Audi A4?

    A: Yes this page includes all the best Universal-Fit Audio & Electronics that work in your A4.

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

    1998 Audi A4

    1978 Buick Regal

    1986 Dodge Conquest

    2009 Kia Spectra5

    2004 Toyota Matrix

    1986 Jeep Comanche

    1966 Cadillac Eldorado

    2005 Mercury Sable

    2014 Buick Verano

    1997 Lincoln Continental

    Vehicle
    Store     Delete

    1995 Honda VFR750F Interceptor

    Vehicle
    Store     Delete

    2016 Can-Am Commander Max 1000 DPS

    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 1998 A4
    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.

    Additional information:

    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