Audi A4 B5 Subwoofer & Speaker Combo – 500W Upgrade

For Audi A4 B5 drivers looking to boost their in-car sound without major custom work, this powerful yet OEM-friendly speaker and subwoofer setup is the perfect solution. Combining high-efficiency Hertz speakers with a compact underseat subwoofer, this kit offers crisp highs, strong mids, and rich, punchy bass – all powered from your factory head unit or a basic amplifier with high-level input.

Why This Setup Works for the A4 B5

• Simple Integration – All components are sized for factory locations in the Audi A4 B5 (1994–2001). • No Trunk Space Lost – The underseat subwoofer installs neatly under the driver or passenger seat. • Impressive Output – With a combined 500W peak power rating, you’ll hear a night-and-day difference over the original system.

Included Components

• Hertz DSK 130.3 Component System (Front Doors)

  • 130 mm woofers, 60W RMS / 120W peak

  • 24 mm tweeters with external crossover

  • 93 dB sensitivity, 4 ohm

  • Clear midrange and smooth highs

• Hertz DCX 165.3 Coaxials (Rear Doors)

  • 165 mm woofers with integrated 15 mm Neodymium tweeters

  • 30W RMS / 120W peak

  • 93 dB sensitivity

  • Easy to install, no separate tweeter required

• Hertz DCX 165.3 Coaxials (Rear Shelf – Sedan only)

  • Same specs as rear doors – fills the cabin with more dynamic rear sound

• Caliber BC121US Active Subwoofer (Under Seat)

  • 100W RMS / 500W peak

  • Compact dimensions: 29 x 21 x 7.2 cm

  • Bass Boost: 0–12 dB at 45 Hz

  • Phase control: 0° / 180°

  • RCA and high-level input for flexible installation

You can check the speaker fit for your car here: Audi A4 B5 Lautsprecher

Installation Gear Included

• 6 MDF adapter rings (front and rear doors) • 6 plug-and-play speaker cables with crimp connectors • Optional: RCA to high-level adapter if no RCA out on OEM radio

Looking for more background on speaker tech? Visit Auto-Lautsprecher for tips and comparisons.

Integration Without an Aftermarket Radio

Most OEM Audi radios from this generation don’t provide RCA outputs, which can make adding an amp or sub tricky. But the Caliber BC121US supports high-level input, allowing easy connection directly to speaker wires.

• Bass enhancement without replacing your radio • Volume matched with factory fade/balance • Controlled via included remote level knob

Still not sure how to tap the speaker lines? Check this guide from Autoboxen for step-by-step advice.

Final Thoughts

Whether you drive an Audi A4 B5 sedan or Avant, this plug-and-play speaker and subwoofer combo transforms your stock setup into a full-spectrum audio system. It's the perfect balance of power, clarity, and practicality for drivers who want premium sound without the complexity of a full custom install.

Enjoy clean vocals, balanced highs, and powerful bass – all from components designed to fit your Audi perfectly.

Happy upgrading!

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