See all parts that fit your 2004 A4
Titan TXi 4-Channel Amplifier
Class A/B 4-Channel Amplifier • 220W x 2 @ 4 ohm • bridgeable design • MOSFET outputs • RCA line outputs • 3-channel mode
Learn more about the txi4406
680W Peak (120W RMS) 6.5" HED Series 3-Way Coaxial 4-ohm Speakers
$79.99
List price $95.99
Rockford Fosgate Prime R1675X2
180W Peak (90W RMS) 6.75" Prime Series 2 Way Coaxial 4-ohm Speakers
$79.99
Class A/B 4-Channel Amplifier • 220W x 2 @ 4 ohm • bridgeable design • MOSFET outputs • RCA line outputs • 3-channel mode
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(newest, current model)
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(previous model, replaced by Hifonics HFi55.4)
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(previous model, replaced by Hifonics TXi 4408)
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6.8" Double DIN Touchscreen Digital Multimedia Receiver with Bluetooth, Apple CarPlay, Android Auto, and SiriusXM Ready
$339.99
List price $420.00
600W Peak (200W RMS) 6.5” CS Series 2 Way Coaxial 4-ohm Speakers
$79.96
List price $119.99
360W Peak (120W RMS) 6.5" Club Series 2-way Coaxial 3-ohm Speakers
$99.95
List price $139.95
480W Peak (120W RMS) 6.5” DS Series 2-way 4-ohm Coaxial Car Speakers (DSC6504)
$84.99
List price $94.99
6.8" Double DIN Touchscreen Digital Multimedia Receiver with Bluetooth, Wireless Apple CarPlay and Android Auto, and Built-in Alexa (Sirius XM Ready)
$469.99
List price $620.00
600W Peak (200W RMS) 6.5" DB+ Series 2 Way Coaxial 4-ohm Car, Marine and Powersports Speakers
$109.00
List price $119.99
6.8" Double-DIN Touchscreen Digital Multimedia Receiver with Bluetooth, Apple CarPlay, Android Auto (Sirius XM Ready)
$299.00
600W Peak (300W RMS) 6.5" Mille PRO Series 3-way 4-ohm Component Speaker System
$999.99
List price $1175.00
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Manufacturer:
Model Number:
TXi4406
Weight:
12.00lbs
Internal SKU:
txi4406
Internal Product ID:
6553
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Universal Remote Bass Level Control Knob
Flush Mount & Universal via RCA. Works with any amp, controls your bass output
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Add a 4-channel amplifier without replacing your factory radio
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Add a 4-channel amplifier without replacing your factory radio
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$21.99
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NVX XIX45 X-Series RCA Interconnect Cable
16.4 ft. of 4-Channel X-Series RCA Cable with Dual Twisted Pair Hyper-Flex Technology
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NVX V-Series RCA Interconnect Cable
19 ft. of 4-Channel RCA cable with dual twisted-pair conductors
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NVX XIV45 4-Channel RCA Audio Interconnect Cable
5 Meters (16.4 ft.) 4-Channel RCA Audio Interconnect Cable with Dual Twisted Pair Hyper-Flex Technology
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All-in-one cable for speaker and amp installation (20 feet)
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75 ft. of True 16 Gauge 100% Copper EnvyFlex Speaker Cable/Wire
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80 Amp Smart Relay Isolator (XSBI80)
Smart isolator - Monitors and auto-charging feature!
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200 Amp Smart Relay Isolator (XSBI200)
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200 Amp Relay Isolator (BIR200)
Great for isolating a second batter making it dedicated to the stereo system
(17)
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500 Amp Smart Relay Isolator (XSBI500)
Smart isolator - Monitors and auto-charging feature!
(8)
$89.99
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500 Amp Relay Isolator (BIR500)
Does not create a voltage drop to the second battery like conventional isolators
(36)
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True 1.0 Farad 20V Capacitor with Digital Read-out, Built-in Distribution Block
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1.0 Farad Capacitor with Digital Red Display for up to 1000W Max
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Belva Nine Function Digital Multimeter
Perfect for any installation and troubleshooting
(7)
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This is a must have! Set your crossover frequency like a Pro
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High Quality Element Resistant AGU Fuse Holder
Belva BAGUH2 AGU Fuse Holder
(2)
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Modular Linkable ANL Fuse Block
Modular Linkable ANL Fuse Block
(4)
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4 Pack of 80 Amp Nickel-Plated MANL Fuse
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(19)
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4 Pack of 100 Amp Nickel-Plated MANL Fuse
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4 Pack of 150 Amp Nickel-Plated MANL Fuse
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(11)
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2 Pack of 100 Amp Nickel-Plated ANL Fuse
ANL 100A Nickel plated for better power transfer
(8)
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2 Pack of 200 Amp Nickel-Plated ANL Fuse
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(23)
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2 Pack of 300 Amp Nickel-Plated ANL Fuse
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(19)
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Modern vehicles often require specific brackets, wiring harnesses, and mounting solutions. A fit guide ensures:
Whether you're replacing a factory stereo or upgrading your entire audio system, the Fit Finder eliminates uncertainty.
