# How to Install Your Bavsound Ghost Underseat Subwoofers

If you’re looking to upgrade the bass response in your BMW with a plug-and-play solution, Bavsound’s Ghost Underseat Subwoofers are a game-changer. This easy-to-follow installation guide will walk you through the step-by-step process so you can enjoy tighter, more accurate, and more powerful bass in your vehicle—all in about an hour!

Why Upgrade to Bavsound Ghost Underseat Subwoofers?

Factory BMW subwoofers can leave a lot to be desired, lacking the deep, punchy bass that true audiophiles crave. Bavsound Ghost Subwoofers:

Deliver increased bass output and clarity
Provide a cleaner, more powerful low-end
Are custom-engineered for BMW models
Feature easy, plug-and-play installation

Now, let’s dive into the installation process!

Tools & Time Required

Estimated Time: ~1 hour
Tools Needed: Bavsound Universal Toolkit or equivalent (including Torx T15/T20 bits and socket wrenches)
Skill Level: Moderate (basic automotive knowledge recommended)

Step 1: Preparing for Installation

Ensure Safety First

Before beginning, make sure your car is parked on a flat surface, turned off, and the battery is disconnected to avoid electrical issues (like an unwanted airbag light).

Adjust the Seat Position

Move the front seat fully forward and fully up to make access easier. If your BMW has a seat rail cover (common on newer G chassis models), remove it by pulling outward and sliding forward.

Step 2: Removing the Seat Bolts

Locate and remove the four seat mounting bolts:
- Two in the front
- Two in the rear
Use a Torx bit to remove the bolts. Convertibles may have extra bolts.
Slide the seat forward for easier rear bolt access.
Lean the seat back gently without fully disconnecting it to prevent airbag warning lights. Use the seatbelt to secure it in place.

Step 3: Removing the Factory Subwoofer

Accessing the Subwoofer

Remove the protective cover by unscrewing the six Phillips or Torx T15/T20 screws (depending on your model).
Unscrew the four subwoofer mounting screws (usually Torx T15/T20).
Unplug the wiring harness by pressing the release tab and pulling it out.
Lift out the factory subwoofer. If it’s stuck due to an old gasket, gently pry it loose.

Step 4: Installing the Bavsound Ghost Subwoofer

Prepping for Installation

Check for an existing gasket – If your BMW has a green factory gasket, remove it. Bavsound’s Ghost Subwoofers include a pre-installed sealing gasket.
Align the new subwoofer correctly – Ensure the notch for the wiring connector is in the correct position.
Reconnect the wiring harness – Firmly press the connector into place.
Secure the subwoofer with screws – Tighten the four Torx T20 screws evenly in a star pattern for proper gasket compression.
Reattach the protective cover.

Step 5: Reinstalling the Seat

Position the seat back over the mounting points.
Start each bolt by hand to ensure alignment before tightening fully.
Torque the seat bolts to approximately 40 ft-lbs.
Check all connections under the seat to avoid triggering airbag errors.

Step 6: Optimizing Your Audio Settings

Break-In Period

Your new subwoofers will sound better after ~20 hours of use. Listening to bass-heavy music will accelerate the break-in process.

Adjusting Head Unit Settings

Treble & Bass: Keep both within a couple of notches from the center.
Balance & Fader: Personal preference, but centered is recommended.
Speed Volume: Keep at minimum to prevent distortion.

Check EQ Settings on Your Music Device

Make sure your phone or streaming service does not have additional bass boosts or EQ enhancements enabled, as these can increase distortion.

Final Checks & Testing

Reconnect the battery and start the vehicle.
Play a variety of music to test bass response.
Listen for rattles or distortion and ensure all screws are tightened properly.
Enjoy your upgraded sound system!

Conclusion: Experience Premium Sound in Your BMW

With Bavsound Ghost Underseat Subwoofers, you’ll experience a dramatic improvement in your BMW’s sound quality. Whether you love deep bass beats or just want a richer, more immersive audio experience, this upgrade is worth it.

Need help or have questions? Drop a comment below or reach out to Bavsound support at support@bavsound.com for assistance.

Enjoy your new audiophile-grade sound system!