Limited Space Sacrifice Provides revolutionary performance without bulky equipment overtaking usable trunk space.	Super Fast Mounting and Removal Using BSW's unique QuickRelease mounting system, you can mount OR remove the entire enclosure assembly in around 30s -- so you have access to ALL your trunk space when you need it.
Tight, Articulate Bass Dual 10" rigid aluminum subwoofers virtually eliminate distortion yielding accuracy, realism, and musical reproduction that is unprecedented from an automotive subwoofer system.	Astonishing, Authoritative Output Combines extremely efficient subwoofer design with stout amplification. Result: a deep, astounding bass foundation that extends effortlessly to frequencies most subs never reach.
True Fidelity State of the art amplification and signal chain insures totally transparent link from source unit to subwoofer for unmatched purity, precision, clarity, and openness.	Rattles? What Rattles? Utilization of pre-existing mounting holes and vehicle specific bracket design for a direct subwoofer to chassis mount significantly reduces the chance of rattles.
Low Weight 49lb. weight for entire system. You won't notice it's there.	Do-It-Yourself Installation Includes step-by-step instructions with photos. Requires only 7 wire connections. An afternoon with your BMW and basic tools is all you'll need.
100% Complete System Includes absolutely everything you need: amp, subwoofer, installation hardware, wiring. Just buy and install.	Performance Guaranteed Unconditionally guaranteed to exceed all your expectations or your money back. You get 30 days to try our products, and if you're not totally happy, send them back for a refund.

the how and why of bass in your BMW

Fully 1/3rd of all recorded music is below 80Hz (this is called bass!) Almost no interior component speaker can reproduce sound below 80Hz without high levels of distortion (some CAN reach to around 60Hz, but that's really the lower limit). The cheap paper drivers BMW uses in their audio systems are no certainly no exception to this rule.

Why? High output bass production requires that a speaker physically moves a great deal of air relative to what's required for higher frequencies. This air movement is accomplished in either or both of the following two ways:

• High Excursion: Excursion refers to how far a speaker can move in or out from its resting state. The smaller the speaker, the larger the amount of excursion required to produce bass output -- and vice versa. However, a small driver with high excursion is far less efficient than a larger driver with lower excursion (require TONS of power from the amplifier) and is very impractical in a car audio situation due to the space required in front of such a driver to accomodate the movement. (It's also difficult to design a very high excursion driver that remains accurate at the limits of its movement).
  
  
• Large Cone Surface: As the cone surface area of a speaker increases, the more air the driver can move -- and the more efficient a driver becomes relative to a speaker with smaller cone surface area. However, the additional mass of such a driver requires more power and a more stout motor structure (the components that control the speakers) to keep the driver controlled and accurate.

Both solutions do require substantial power output from the amplifier driving them, but power can be expensive. For cost savings reasons, manufacturers will produce a larger coned driver out of lightweight material (i.e. paper) to minimize power requirements. Unfortunately, the resulting lightweight subwoofer is flimsy, and when combined with low power yields muddy, fuzzy bass at moderate volumes and distortion at high volumes. This is PRECISELY the case in BMW's premium systems equipped with a subwoofer.

And if you don't have the premium system, because your stock amp and speakers (and even high quality component speakers and an aftermarket amp) are small in size, share the same lightweight construction, and are low in power, you'll get the same fuzzy bass, just less of it.

And so, an effective, high power subwoofer solution is needed. But with the BSW d210.e36, it doesn't have to come with sacrifices.

Installation Instructions

Simply click the link(s) below to download installation instructions. Instructions are in PDF format. To view them, you'll need to download Adobe's Acrobat Reader (available at www.adobe.com) if it isn't already installed on your computer.

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absolutely everything you need is included!

The BSW d210 subwoofer system is a 100% complete kit. All you need is basic tools!

BSW d210 Subwoofer Enclosure & Mounting Hardware	Dual BSW by Alumapro 10" Alusonic EX Aluminum Cone Subwoofers
Rockford Fosgate P400-2 Amplifier (400W @ 4 Ohms)	All required installation hardware, wiring, and accessories
Detailed step-by-step instructions with photos	BSW 100 % Performance Guarantee Unconditionally guaranteed to exceed all your expectations or your money back.

Is this EVERYTHING I need?

Yes, we include absolutely every single component you need! There is absolutely nothing else you need to purchase outside of the BSW d210 Subwoofer System to install and enjoy our system.

Can I install the d210 Subwoofer System in my BMW myself?

Yes, you can! We ship every BSW d210 Subwoofer System with extremely detailed installation instructions with photos and provide telephone support for the process as well. Because it's a simple installation (you're basically just tapping one audio signal and getting power from the battery - that's it!) with only the most basic of skills required, you can probably do it. However, if you feel unsure, we always recommend professional installation. Fortunately, because the installation instructions are so good and everything you need is included, if you don't feel comfortable with the installation process, any decent car audio shop can perform the installation for you without any difficulty whatsoever - probably for about $150 or less.

Will this work with my Standard or Harman-Kardon equipped 3 Series / M3? Will it make a big difference?

Yes, absolutely! In your BMW's audio system, even the Harman-Kardon systems, bass response is terrible. Because our d210 Subwoofer System provides as little or as much additional bass response as you want, you'll see a VERY nice improvement in sound quality and low-end frequency response in your BMW, regardless of whether you have the most basic BMW audio system or the nicest.

My trunk is completely sealed. Will I really be able to hear the bass in the cabin?

Yes, definitely. Because we specialize in BMW's, we understand that the trunk areas are very frequently 100% sealed from the interior of the car, and as a result, this important consideration was taken in mind during every step of the design process. This means that our d210 Subwoofer Systems are high-output and will absolutely produce enough output (volume) to really hear, feel, and truly enjoy!

What components are included in your d210 Subwoofer System?

Click the "What's Included" tab above for an itemized list of the components used in this subwoofer system.

Why don't you use more common name brands like JL, Infinity, etc.?

We haven't used more commonly known "name brand" components in our subwoofer systems because we wanted to provide the absolute best system possible for the most reasonable price to our customers. Frankly, much of what you pay for when you go "name brand" is just that - the name. Our testing revealed that the components from the smaller companies that we're using in our subwoofer systems provide a MUCH better value because you aren't paying for a name. You're paying for the quality of the components and engineering, and as such, for the same amount of money you get so much more performance, output, and clarity. So, in short, we use the components we've selected because they give you, the customer, the very best "bang for the buck."

Do I need to replace my factory amplifier or head unit?

No, you don't. We include a new amplifier to power the subwoofers included in the d210 Subwoofer System. If you have your factory head unit, we also include all the necessary wiring you need to integrate this system with your factory head unit. This system also works with all aftermarket head units as well!

Will the d210 Subwoofer System be visible from within the car or require any permanent modifications?

No, our Dual Sub System is completely invisible within the car. Only you and your fellow listeners will know that you've upgraded your stereo since your car will maintain a 100% factory appearance within the vehicle. And in the trunk, because the BSW d210 Subwoofer Enclosure used has a stealth, clean look, it's hard to tell there's a sub system in your trunk, either!

The only permanent modification required to your vehicle are the attachment of two very small (approx. 1" x 2") reinforcement plates to your vehicles rear deck via 3 very small screws each. Once installed, these can't be seen from eye level.

Does the BSW d210 Subwoofer System fit with a strut brace?

Yes! We have verified fitment with the Dinan 3 Series / M3 strut brace. We have not tested other braces on the market, but due to the 1/2" clearance between the brace and subwoofer enclosure, it is very likely this system will fit with all other braces on the market.

Does the BSW d210 Subwoofer System come with a warranty?

Yes, it sure does! The warranty is 2 years, parts only, on all components of the d210 Subwoofer System. If you ever have any issues, we're just a phone call away. Please note that this warranty does not cover subwoofers blown due to abuse.

Any other questions? Just contact us!