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MB Quart FSB 216

6-1/2" 2-Way Formula Series Component Speaker


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This item has been discontinued

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  • 6-1/2" Formula Series 2-Way Component Speakers System
  • Power Handling:
    • Peak: 300 watts per set / 150 watts each side
    • RMS: 80 watts per set / 40 watts each side
  • Dark gray polypropylene cone
  • Butyl rubber surround for smooth speaker response
  • 3/4" (19mm) Titanium dome tweeter
  • In-line crossover for accurate frequency separation
  • Woven tinsel leads
  • Progressive grille
  • 4 ohms impedance
  • High temperature voice coil
  • Spade speaker terminals
  • Top-mount depth: 2-3/8"
  • Authorized Internet Dealer
  • 1-year Manufacturer's warranty

Priced Per Complete Component System: 2 midwoofers, 2 tweeters and 2 crossover networks.

Product History:

MB Quart FSB 216 thumbnail
(newest, current model)
MB Quart FSA-216 thumbnail
(previous model, replaced by MB Quart FSB 216)
MB Quart ESA-216 thumbnail
(previous model, replaced by MB Quart FSA 216)

Speaker Specifications

This is the manufacturer product line of speakers.
Priced Per
Car Speakers are typically sold in pairs so you will receive 2 speakers for each speaker purchase on speakers marked "Priced Per Pair". If a speaker is marked "Priced Per Each" then the speaker is sold individually and each purchase you make will result in 1 speaker. High-powered tweeters, midrange and full-range pro audio for car speakers are typically sold per each speaker.
Speaker Size
Refers to the size of the speaker measured in inches. Every vehicle has standard application sizes. Please use our vehicle fitment guide for your vehicle's specific speaker sizes if you do not know them.
The number of individual drivers in a car speaker. Speakers with 2 drivers are known as a 2-way, and 3 drivers are known as a 3-way. Component systems are often referred to as "separates" because the tweeter is not attached to the midwoofer (main speaker driver) and mounts separately in a location such as a door post. Component systems typically come with an external crossover so you can easily adjust the high and low frequencies sent to both the midwoofer and the tweeter. Center channel speakers are great for those looking to have surround sound in their vehicle.
2-way Component System
Tweeter Design
Designs such as cone, dome, semi-dome, balanced dome, and whizzer are most popular. Cone tweeters are simple, efficient and typically are the most reasonably priced. Dome tweeters are used in most home speakers, and provide a smoother and more accurate sound. Semi-dome design is one with a dome placed inside a cone. A Balanced dome driver is a semi-dome with equal reproduction area given the cone and dome portions of the driver. A whizzer tweeter is a separate tweeter cone driven by the voice coil of the woofer.
Tweeter Size
Refers to the size of the tweeter. Typically, smaller tweeters produces less output with higher frequency response.
Tweeter Composition
Materials such as polypropylene, silk, cloth, and paper are the most common, where as many more recent tweeters are now manufactured with composites such as Aluminum, Titanium, Mylar, and other materials.

PEI is an acronym for "Polyetherimide" which is an amorphous, amber transparent, high-performance thermoplastic.

Woofer Composition
Lightweight woofer cone materials are essential for efficient operation. Poly cones produce exceptional sound and are sturdy against various changes in temperature. Paper cones are very efficient, and when treated for moisture resistance, will perform at a high level. Poly refers to polypropylene, which is thermoplastic or fibers that are polymers of propylene. IMPP refers to injection molded polypropylene, a commonly used process and material in speakers.
Woofer Surround
A speakers surround is part of the suspension system. The surround protects the cone and prevents it from being displaced as it flexes out from the basket. It is usually made of a durable material like treated foam or rubber in order to withstand the strenuous job of producing bass frequencies.
Butyl Rubber
Peak Power Handling
Peak power handling refers to the amount of power a speaker can handle during a brief musical burst. The RMS power range figure is a much more reliable rating for determining the speaker's power requirements. The Peak power handling specification is typically rated per speaker unless otherwise noted.
150 watts
RMS Power Handling
The RMS power is the amount of power the speaker requires to operate safely and properly. RMS Power Handling refers to the amount of power a speaker can handle on a continuous basis. We recommend powering your speakers or subwoofer with 80%-120% of its recommended RMS rating. The RMS power handling specification is typically rated per speaker unless otherwise noted.
40 watts
An efficiency or sensitivity rating tells you how effectively a speaker converts power into sound. The higher the number, the more efficient the speaker and the louder it will play with the same input power. An efficient speaker helps you maximize your available power. Most sensitivity ratings measure the speaker's output with 1 watt of input, 1 meter from the speaker. Some speakers' sensitivity is measured with 2.83 volts of input, instead of 1 watt.
Efficiency (1w/1m) is not an accurate indicator of a subwoofer's output capability and should not be used as a comparison to other speakers or subwoofers to determine which one is "louder".
84 dB
Frequency Response
The range of frequencies the speaker will reproduce (lowest frequency to the highest). Bigger is better, meaning the wider the range, the better. The optimal range is 20 - 20,000 Hz (which is the range of human hearing).
58 - 32,000 Hz
Impedance (Per Voice Coil)
The load value (in ohms) that the speakers present to the amplifier per voice coil - the amount of resistance to the current flow. This is a key specification as subs wired in parallel or low impedances can create problems with your amplifier and potentially void all warranties. We encourage you to ask our support department prior to purchase if you do not understand which impedance level will suit your application best.
4 ohms
Shallow Mount Installation
This means that the subwoofer/speaker is designed to be installed in areas that do not have a lot of space. Shallow mount subwoofers are typically found under a seat or behind the seat in some trucks.

Shallow mount speakers will typically have a mounting depth of 2" or less, while shallow mount subwoofers will typically have a mounting depth of 3" or less.

Top-Mount Depth
The depth when installed on top of the mounting surface. Measured from the bottom of the speaker's magnet to the bottom of the mounting holes on the rim of the speaker.
Bottom-Mount Depth
The depth when installed from the bottom of the mounting surface. Measured from the bottom of the speaker's magnet to the top of the mounting holes on the rim of the speaker.
Cutout Dimensions
Refers to the dimensions of the hole, measured in inches, required to contain the speaker.
Cutout Dimensions
Refers to the dimensions of the hole, measured in inches or millimeters, required to contain the speaker.
4-5/8" x 4-5/8" 
Speaker Grilles
A grating or screen of metal or plastic bars or wires, mounted in front of a speaker as protection. If yes, the speakers will include matching speaker grilles. If no, there are no grilles included.
Number of Speakers
This is the number of speaker that is included in the package. Each purchase will result in receiving the number of speakers indicated here. Please note that some items will have multiple woofers in the same enclosure. For sets of component speakers, this number will refer to the number of sets of speakers (For example, 2 would indicate the purchase includes 2 woofers and 2 tweeters).

Please refer to the product image and description for further details about the speaker.

Specials with this Item

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Warranty and Return Policy

Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider

Summary of Customer Ratings & Reviews

Rating Distribution

5 Star
4 Star
3 Star
2 Star
1 Star

Average Attribution Rating


Miramar, Fla.

Best OEM substitute for MBZ

March 23, 2012

I just bought these for my MBZ C230. One of the door speakers was shot and it really made my stereo sound crappy. Tried shopping around for some coaxs. Tried a few from Pioneer and Kenwood and they didn't work. The door speakers have a passive cross-over so the coaxs sounded really 'shelly'. Went back to the drawing board when I stumbled across these. Took me about 30 mins to install with a little help from my dremel and my soldering gun but I'm extremely satisfied with the outcome. The tweeters sparkle and the 6's hit nice and solid. Perfect compliment to the stock woofers in the rear doors.

5 of 6 found this helpful

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Exmore, Va


July 31, 2012

Great speakers, with quality sound. For the price of the MB Quart speakers and the rich sound in which they produce, they have always been a great buy. I select components for my systems that work great together and the MB Quart speakers are always selected to carry the inside staging for me.

6 of 10 found this helpful

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apple creek, OH

Pretty Good

April 16, 2013

These speakers have a great sound. The tweeters a little bit bright but you can change that with cross overs. The cross overs suck. I personally separated 2 channels for tweeters and two channels for the mid woofer. That way i can fine tune my system with out buying other cross overs. Plus i honestly think that your amp will have the best cross overs anyways unless your dealing with some expensive speakers like JL, Rockford, or Focal.
The tweeters also blew when i was playing really loud.
If i were you, Id spend a little extra to get the onyx series.

5 of 9 found this helpful

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Belleville, IL


April 26, 2013

Good for the money...I want to buy another set for my boat!

5 of 10 found this helpful

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Owensboro, KY

great balance of mids and highs

February 10, 2013

I run these speakers off of an Alpine KTP-455 and it is a great match. I can CRANK these babies and there is never a hint of pushing them to the limits. The highs soar and the mids are tight and punchy. Awesome speakers for a small amp. If you want a great pair of reasonably priced components, look no further. I will not buy car audio from anyone else but Sonic.

5 of 10 found this helpful

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Good value for money

November 16, 2011

I ran this off a 300W amp.
*cost effectiveness
It was the cheapest of the "low wattage" speakers and yet had an impressive range on paper. The only negative point (on paper) was the low sensitivity (84dB?).
When put to practice in the real world, these performed decently and I had no complaints whatsoever.

*installation notes
The 2 1/2" bottom mount depth was also a consideration, as I was not confident the larger 6.5" components would clear the doors.

The spade connectors came with plastic jackets so you don't have to add tape / heatshrink to the connections.

The red and black wires to the crossover seemed skinny... too skinny. Almost like 24awg. Not confidence inspiring at all. It may be irrational but we always feel good with chunky wires.

The tweeters came with different mounting options (flush / pod). MB Quarts are reputed to sound overbright but these sounded just right.

Overall, a good buy on a budget.

4 of 8 found this helpful

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Merced, CA

Excellent value and performance

May 30, 2012

MB Quart is known for their highs being too bright. This is not the case with these units. The midbass has punchiness and the vocals are smooth. The highs are seamless and clear without being raspy or overpowering. Pick the right amp for your subs and these should compliment your system nicely.

4 of 9 found this helpful

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Orange county CA

MB Quartz

April 25, 2012

Highly recommended. Great speakers for the money. Great size for shallow install. Good highs, mids not much on lows. Maybe it was my headunit, but I had a sub anyway.

3 of 7 found this helpful

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Brooklyn, NY

Top quality

April 10, 2012

Bass hits nice and deep, while highs are crystal clear

5 of 11 found this helpful

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You get what you pay for

January 11, 2012

I have these installed in the doors of my 2000 cavalier Z24 winter beater.

Custom work was required to install due to woofer depth, and I installed the tweeters in pods at top of doors (after several days of listening, I ended up installing off-axis, facing opposing side of car, which sounded best and gave a balanced image with minimal time alignment required from my headunit). Doors are vibration damped with dynamat, and speakers are driven with 120 rms per channel. Head unit is a Kenwood X995. I listen to all types of music, including top 40, folk and rock.

Installed these as a first attempt when looking for an inexpensive improvement over the coax units in the car from the previous owner. At low to moderate volumes, the tweeters are overly efficient and are unbalanced to the woofers (I attribute some of this to my elevated mounting position) and induced listening fatigue fairly quickly. At elevated volume levels, the tweeters get downright harsh and nasty. Midbass is as expected from a 6.5" driver, and only gets uncontrolled at high power levels. I am running them with a 12 db/oct HPF at 60 hz. The tweeters were so tiring that I ended up installing L-pads to drop their output by 8db, which has made the speakers sound more balanced and cleaner. The tweeters still get harsh sounding when driven hard, and I will be swapping these out when I get a chance.

Previously I had used MBQuarts in a few installs back in the mid 90's which is why I started with these, but those older units were much better (and more expensive) speakers. My next trial will be with the PVL 216's, which I recently ordered from Sonic too. In the end, I guess you get what you pay for. Luckily, I love tinkering around with audio systems, and I look forward to finding that elusive combination of affordable quality sound.

1 of 8 found this helpful

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Accessory Tools and Products

Accessories added

Streetwires 50 ft. of True Spec 16 Gauge Speaker Wire

You need speaker wire to connect your speakers!

Your Price $29.99

Belva 23 ft. of True Spec 16 Gauge Speaker Wire

100% Copper Clad Aluminum, PVC blended jacket for easy installation and high strand count for maximum audio quality

Your Price $12.99

16-14 AWG Butt Connectors

These blue butt connectors are ideal when connecting thicker speaker wire your new aftermarket speakers!

Your Price $4.99

16-14 AWG Quick Disconnect Connectors

These blue quick disconnect connectors make it easy to connect and disconnect speaker wire your to your new aftermarket speakers!

Your Price $7.99

NVX SDSK2 Speaker Kit

Eliminates speaker panel distortion and reduces vibration, rattles, and squeaks!

Your Price $14.99

Dynamat Xtreme Speaker Kit 10415

Enough sound dampening for 2 speakers!

Your Price $17.95

Stinger Roadkill Speaker Kit

Use this to eliminate rattle from your speakers!

Your Price $13.99

Car Stereo and Speaker Installation Tool Kit

Includes Test Light, Crimp/Splice Tool, Multi-bit Screwdriver and more.

Your Price $16.99

Universal Wire Puller & Grabber

Running wires has never been easier! This wire puller allows you to run wires through those hard to reach places!

Your Price $6.99

Xscorpion 9-Piece Nylon Plastic Pry and Chisel Tool Set

Easily removes dash/trims, door clips, panels and pins, rubber grommets and vehicle emblems.

Your Price $14.99

Xscorpion WDCR2 Window and Door Clip Remover

Removes and installs handle and window crank clips.

Your Price $6.99

3 in 1 Wire Quick Splice T-Tap and Butt Connector Crimper + Wire Cutter

Used for cutting copper and aluminum wires up to 8 gauge.

Your Price $29.99

NVX SDRLR1 Sound Dampening Rubber Roller

Install your Sound Dampening with ease! This heavy duty rubber roller is designed specifically to install your NVX products!

Your Price $7.99

Speaker Baffles for your Speakers

Enhance the sound of your speakers with these easy to install speaker baffles.

Your Price $9.99

XTC 6-1/2" Round Large Frame, Shallow Foam Speaker Baffles

Creates a tight seal behind speaker for enhanced audio quality.

Your Price $12.99

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Product Summary


Model Number

FSB 216





Internal SKU


Internal Product ID


Sonic Electronix Wiring Guide

Wiring Diagram Legend

Warning: The image depicted shows the resistance change when wiring multiple subwoofer terminals. Please refer to your subwoofer's owner's manual for the proper wiring of its terminals. Sonic Electronix, Inc. is not responsible for damage caused to your audio system or vehicle due to improper installation. Please call tech support at 1-877-289-7664 if you require additional assistance.

Product Name: MB Quart FSB 216