Double the bass in your BMW, in about an hour.

Swap your factory underseat woofers with our plug & play upgrade kit, and get incredibly powerful, tight bass.

Double the bass

Don't just listen -- feel and experience your music

Includes everything you need

No expensive, complex additional amplifiers, wiring, hardware, or equipment required

Do-it-yourself

Do-it-yourself installation in about an hour, even for a novice

More space = more fun

Keep every single inch of your trunk

Double the bass. Don't just listen to your music. Feel it

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2X THE BASS - Our woofers are 10 dB+ louder at from 20Hz to 60Hz vs factory woofers, resulting in twice the loudness in this critical “sub-bass” range (and over 8x the sonic energy). You won’t just hear the bass; you’ll feel it.

NEARLY FLAT FREQUENCY RESPONSE FOR EXCEPTIONAL LINEARITY in the key sub / mid-bass frequency range from 40Hz to 200Hz (+ or - 3 dB). Because tons of output is useless without balance and control.

100 day in-car trial, free returns

Install, audition, and fully experience your new audio gear -- if you don't love it, we'll cover return shipping and give you a full refund. Plus, we'll even refund 100% of your installation and removal costs.

100% Plug & Play

Installs and fits just like your factory BMW woofers, right down to the bolts and factory style plug. (NOTE: Vehicles with “Base” audio systems require slight modification to factory enclosure that add mere minutes to installation)

Simple , do-it-yourself installation

Takes less than 90 minutes and only basic tools, even for a total novice. No complex wiring or additional hardware or installation is required. Simply unbolt your front seats, remove the woofer covers, unbolt your factory woofers, and install ours. That's it!

Use your factory amplifier and get exceptional bass response

We utilize your factory amplifier to generate amazing bass response in your BMW. To do so, we've designed our woofers using technologies like oversized neodymium magnets and lightweight poly cone to maximize every watt of power they generate and translate that into raw output. That means amazing bass response without replacing your amplifier.

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Super tight, punchy midbass

Your factory underseat woofers aren't just subwoofers; they're midbass drivers. That means they play not just the lowest frequencies, but also "punchy" midbass frequencies like snare drums and high bass guitar notes.

Unlike our woofers, which are designed to outperform the factory woofers for both subwoofer and midbass frequencies, other underseat subwoofer upgrades on the market are only capable of playing sub frequencies, not midbass, so you miss a huge portion of the frequency range.

Perfectly matched to our legendary stage one speaker upgrade kit

Amazing bass response can transform your listening experience, but if you want the absolute best, overall sound quality and clarity matters too.

That's why we engineered the Ghost Underseat Subwoofer Upgrade System to perfectly and seamless match our legendary Stage One Speaker Upgrade Kit.

4 years warranty our products are bulletproof so is warranty.

Everything we sell has been engineered for durability and longevity, and we know what we sell will last. And last. And last. That’s why our speaker upgrades and subwoofer systems are backed with our industry leading 4 year limited warranty. So if something breaks, send it back. We’ll replace it at no charge.

Factory matched impedance

Depending on your audio system, your factory BMW woofers come in 2, 4, or 8 Ohm impedance. Our woofers are matched to the impedance of your factory woofers (we have different versions for each) to maximize performance and ensure the longevity of your factory amplifier.

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Upgradeable design with 100W RMS / 200W peak power handling per woofer

Even though our woofers are designed to be extremely efficient to maximize the output of your factory amplifier, they're also built for upgradability, you can power them with an aftermarket amplifier of your choice up to 100W per channel.

Translation? If you'd like to melt your face off with absurd quantities of bass, you can -- just add an amp.

Featured reviews of the Ghost Underseat Subwoofer Upgrade

icon__star icon__star icon__star icon__star icon__star--half-filled 4.7/5 (39)

Amazing

I admit that I was skeptical that new speakers could live up to the claims of increased volume and sound quality,

but I was blown away. Prior to the complete Bavsound speaker changeout, my 2011 328i basic stereo could not fill the car with sound, even at full volume with the windows closed. Now the thing positively bumps, even with the windows open. I did the installation myself and ran into a self induced problem, but a quick call to Bavsound got me in touch with Jeremy who told me where to look for the trouble. Jeremy nailed it and my problem was no problem. I'm very pleased with the service, prompt delivery, packaging, and most of all the SOUND.

I admit that I was skeptical that new speakers could live up to the claims of increased volume and sound quality,

but I was blown away. Prior to the complete Bavsound speaker changeout, my 2011 328i basic stereo could not fill the car with sound, even at full volume with the windows closed. Now the thing positively bumps, even with the windows open. I did the installation myself and ran into a self induced problem, but a quick call to Bavsound got me in touch with Jeremy who told me where to look for the trouble. Jeremy nailed it and my problem was no problem. I'm very pleased with the service, prompt delivery, packaging, and most of all the SOUND.

icon__star icon__star icon__star icon__star icon__star James D. Ghost Subs Sept 17th

If I were any happier I'd be twin Bavsound subs.

For starters, as I am in sales, I have to commend Bavsound on their great marketing and promotional offers,

finding their way to BMWCCA publications, Bimmerpost, etc. When I submitted my info to receive a promo offer for a free toolkit, the communications I received were really offering the value of the product. They clearly stated the advantages of their product. When the 0% financing option came along, I couldn't wait and decided to improve my bass. The install video was clear and even entertaining. The speakers were an obvious improvement over my h/k stock subs. Also, upon install and adjusting to the recommended EQ settings from Bavsound, I was enthralled to discover overall output, clarity and full spectrum response was improved. Being able to replace my subs without modifying my car and having the ability to swap back out before I sell or trade was well worth the few hundred bucks it cost. The only problem I had was a minor issue. I had wanted the free toolkit promo but it was somehow deleted from my order before checkout when I signed up for the 0% financing. I called customer service, almost three months later to express my frustration and admit that it was my fault that I didn't scrutinize the order before final submission. Without hesitation the gentleman I spoke with in customer service told me it would be no problem to ship me the toolkit. The customer service is as great as the speakers themselves. I would recommend Bavsound products to anyone that has a BMW and ears.

For starters, as I am in sales, I have to commend Bavsound on their great marketing and promotional offers,

finding their way to BMWCCA publications, Bimmerpost, etc. When I submitted my info to receive a promo offer for a free toolkit, the communications I received were really offering the value of the product. They clearly stated the advantages of their product. When the 0% financing option came along, I couldn't wait and decided to improve my bass. The install video was clear and even entertaining. The speakers were an obvious improvement over my h/k stock subs. Also, upon install and adjusting to the recommended EQ settings from Bavsound, I was enthralled to discover overall output, clarity and full spectrum response was improved. Being able to replace my subs without modifying my car and having the ability to swap back out before I sell or trade was well worth the few hundred bucks it cost. The only problem I had was a minor issue. I had wanted the free toolkit promo but it was somehow deleted from my order before checkout when I signed up for the 0% financing. I called customer service, almost three months later to express my frustration and admit that it was my fault that I didn't scrutinize the order before final submission. Without hesitation the gentleman I spoke with in customer service told me it would be no problem to ship me the toolkit. The customer service is as great as the speakers themselves. I would recommend Bavsound products to anyone that has a BMW and ears.

icon__star icon__star icon__star icon__star icon__star Benjamin A. Ghost Subs Oct 1st

These work wonderfully

I think my speakers sound better than the HK system in my E90. The Ghost Underseat subwoofer is phenomenal. I love them!!

I think my speakers sound better than the HK system in my E90. The Ghost Underseat subwoofer is phenomenal. I love them!!

icon__star icon__star icon__star icon__star icon__star--empty GARY S. Ghost Subs Jul 3rd

Extremely impressed

I've had the 8-ohm ghost subwoofers in my F30 335i for a little over a month now and I'm extremely impressed.

I've got the HK system and while I was relatively happy with overall sound quality the low end was really lacking. Now that they've opened up they have really filled in the lower frequencies. I was considering adding a subwoofer in the trunk but I'm not convinced that it's needed anyone. I am very pleased with these the ghost subwoofers and high recommend them.

I've had the 8-ohm ghost subwoofers in my F30 335i for a little over a month now and I'm extremely impressed.

I've got the HK system and while I was relatively happy with overall sound quality the low end was really lacking. Now that they've opened up they have really filled in the lower frequencies. I was considering adding a subwoofer in the trunk but I'm not convinced that it's needed anyone. I am very pleased with these the ghost subwoofers and high recommend them.

icon__star icon__star icon__star icon__star icon__star--empty Robert T. Ghost Subs Jan 25th

How it works

How do we deliver bass that's louder, cleaner, and tighter, all without changing the factory amplifier?

In a word, efficiency. Every watt of power generated by your factory amplifier yields far more bass output with our woofers. So even without changing your factory amp, you get breathtaking bass response.

(With your factory woofers, your amplifier is like a 200hp motor in a Camry.With ours, it’s like the same 200hp motor in a Lotus Elise)

Sketch of BMW Underseat Subwoofer Upgrades

One

Remove your factory underseat subwoofers

Two

Swap your factory woofers with ours, which are 100% plug and play (don't need to change ANY other component in the car)

Three

Enjoy louder, tighter, punchier bass response - without changing any other component

Installation

One

Just unbolt your front seats and tilt them back (no need to unplug any wires)

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Two

Unscrew the woofer covers and remove them

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Three

Unscrew, unplug, and remove the factory woofers

Icon installation step 4

Four

Install and plug in your new Ghost Woofers

Icon installation step 5

Five

Reinstall the factory woofer cover, and bolt your seats back down

Icon installation step 6

Six

Enjoy!

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