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2004 Audi TT

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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 2004 Audi TT

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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Amplifier wiring kits,
Subwoofers (1,140)
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Power and ground wire (130)
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FM modulators and transmitters (1)
Multi-camera and DVR systems (1)
Overhead monitors (1)
Remote mount media players (1)
Price Range
Power/Ground Wire Size
The power/ground gauge numbers represents the main wire size of the amplifier kit.

Definitions are as follows:

Gauge (wire) - The diameter of a wire. The higher the number, the thinner the wire. Example: 4 gauge wire has more strands than 10 gauge wire.

AWG (American Wire Gauge) - A standard of the dimensional characteristics of wire used to conduct electrical current or signals. AWG is identical to the Brown and Sharpe (B & S) wire gauge.
Interconnect (RCA) Signal Cables Included
Interconnect cables are required for amplifiers which are installed to the "RCA preamp low-level outputs" of a car stereo receiver. If your amplifier has high-level / speaker level inputs, then you do not need to purchase interconnects; however, interconnects offer a much higher quality sound when compared to speaker level inputs.
Speaker Wire Included
If speaker wire is included, the value will be "Yes" and if no wire is included, it will read "No".
Fuse Holder
This is the type of fuse holder that is included in the item.
Fuse Size
This is the size of the fuse that is compatible with the fuse holder. If the fuse needs to be replaced, be sure to replace it with the same size.
Number of Amplifiers Supported
This is the number of amplifiers that the amplifier kit can support. If you are are going to be powering more than one amplifier, make sure that the installation kit will support them.
Wire Material
The material that the wire is made of. Copper & aluminum are the most commonly used materials. OFC - Oxygen Free Copper is the ideal choice for wire material. Copper is a superior electrical conductor, & does not expand or contract with heat. CCA - Copper-Clad Aluminum is a suitable choice for lower powered or budget applications. The power transfer is not on par with OFC, but this material offers significant savings.
Complies to AWG Standards
Since 1857, The AWG (American Wire Gauge) system has been the standard for measuring the diameter of wire. AWG standard is the measure of bare wire to find true gauge. Companies that do not follow AWG Standards include the thickness of the wire jacket which means the actual wire is not "True to Gauge". For the best performance from your amplifier wiring kit, make sure that the cable complies to the AWG standard.
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Sundown Audio 1/0KIT

1/0 Gauge OFC (Oxygen Free Copper) Complete Amplifier Installation Kit

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Sundown Audio 1/0KIT

1/0 Gauge OFC (Oxygen Free Copper) Complete Amplifier Installation Kit

• 1/0 gauge Complete Amplifier Installation Kit
• Made from OFC (100% Oxygen-Free Copper)
• 2 Channel RCA interconnect cables included

15% off an NVX XCAP10H w/ Select Amp Kits
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List price $419.99
-17% $349.99
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Shop items below for 15% off up to $100 discount on Get 15% off an NVX XCAP10H

NVX XCAP10H (TRUE 10 FARAD CAPACITANCE)

NVX XCAP10H (TRUE 10 FARAD CAPACITANCE)

$299.99

$254.99

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• 1/0 gauge Complete Amplifier Installation Kit
• Made from OFC (100% Oxygen-Free Copper)
• 2 Channel RCA interconnect cables included

Limited time!

Stinger SEA4287

22.9 ft. 8 Gauge 100% (OFC) Oxygen Free Copper Marine Amplifier Wiring Kit

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Stinger SEA4287

22.9 ft. 8 Gauge 100% (OFC) Oxygen Free Copper Marine Amplifier Wiring Kit

• 8 gauge Complete Amplifier Installation Kit
• Designed specifically for marine audio systems up to
• Made from OFC (100% Oxygen-Free Copper)
• Power and ground wires in a "Siamese Pair" construction

15% off an NVX XCAP1F w/ Select Amp Kits

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List price $159.00
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Shop items below for 15% off up to $100 discount on Get 15% off an NVX XCAP1F

NVX XCAP1F

NVX XCAP1F

$109.99

$93.49

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• 8 gauge Complete Amplifier Installation Kit
• Designed specifically for marine audio systems up to
• Made from OFC (100% Oxygen-Free Copper)
• Power and ground wires in a "Siamese Pair" construction

NVX - Worth the Envy - Direct to Consumer Car Audio
Limited time!

NVX XAPK4 (Like New (Open Box))

Full Spec 4 Gauge 100% (OFC) Oxygen Free Copper Amplifier Power Wiring Kit with Speaker Wire for Amplifiers up to 1500 Watts

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NVX XAPK4 (Like New (Open Box))

Full Spec 4 Gauge 100% (OFC) Oxygen Free Copper Amplifier Power Wiring Kit with Speaker Wire for Amplifiers up to 1500 Watts

• 4 Gauge Power Amplifier Installation Kit
• For Amplifiers Up To 1500 Watts RMS
• 100% (OFC) Oxygen Free Copper
• Tinned conductors for corrosion resistance
• Pre-terminated seamless power and ground ring terminals
• ANL/Mini-ANL Fuse Holder with 100 amp fuse
• CEA-2015 and BC5W2 Compliant

Purchase $400 or More of NVX and Save 15%!

Universal Icon Universal – fits most vehicles.

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• 4 Gauge Power Amplifier Installation Kit
• For Amplifiers Up To 1500 Watts RMS
• 100% (OFC) Oxygen Free Copper
• Tinned conductors for corrosion resistance
• Pre-terminated seamless power and ground ring terminals
• ANL/Mini-ANL Fuse Holder with 100 amp fuse
• CEA-2015 and BC5W2 Compliant

TruConnex TC4KIT-8B by Metra + Belva BBIC3

8 Gauge Full Spec CCA Amplifier Wiring Kit for Systems up to 450 Watts Package

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TruConnex TC4KIT-8B by Metra + Belva BBIC3

8 Gauge Full Spec CCA Amplifier Wiring Kit for Systems up to 450 Watts Package

• 8 Gauge Power Amplifier Installation Kit
• Ideal for Systems Up to 450 Watts
• Premium Power and Ground Wire Provides Optimal Power Transfer

Universal Icon Universal – fits most vehicles.

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List price $89.97
-61% $34.97
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• 8 Gauge Power Amplifier Installation Kit
• Ideal for Systems Up to 450 Watts
• Premium Power and Ground Wire Provides Optimal Power Transfer

NVX - Worth the Envy - Direct to Consumer Car Audio
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    FAQ for Universal-Fit Audio & Electronics in 2004 TT

    Q: Can I upgrade or change the Universal-Fit Audio & Electronics in 2004 Audi TT?

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

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    Modern vehicles often require specific brackets, wiring harnesses, and mounting solutions. A fit guide ensures:

    • You see only parts engineered for your exact vehicle
    • You avoid incompatible radios, speakers, or wiring
    • Installation is smoother, faster, and frustration-free
    • You get the correct accessories the first time

    Whether you're replacing a factory stereo or upgrading your entire audio system, the Fit Finder eliminates uncertainty.

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