MB Quart FSB216

280W Peak (140W RMS) 6.5" Formula Series 2-Way Component Speaker System

MB Quart
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• 140 watts Peak Each, 70 watts RMS Each
• Aluminum Dome Tweeters
• Lightweight thermal-formed Polypropylene cone material
• Impedance: 4 ohms
• Sensitivity: 84 dB

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Current Promotions (1 offer)

Get the most out of your speakers with simple peel-and-stick speaker baffles, sound damping, roller, and a panel removal kit to make installation a breeze! This offer cannot be combined with any other coupons or offers.

MB Quart FSB216

25% off

Priced separately $107 96

Promo Savings of $13 49

Total price:

$94 47


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Product Details:

  • 6-1/2" Formula Series 2-way Component System Car Speakers
  • Power Handling:
    • Peak: 280 watts per set / 140 watts each side
    • RMS: 140 watts per set / 70 watts each side
  • Polypropylene Lightweight thermal-formed cone material
  • Butyl Rubber speaker surround
  • Aluminum Dome Tweeters
  • Textured ABS gasket
  • Natural fiber spider
  • Over-coil cooling system
  • External Passive Cauer topology Butterworth filter crossover
  • Heavy gauge progressive-die stamped steel frames
  • Ferrite magnet motor structure
  • Top-mount Depth: 2.12"
  • Cutout Dimensions:
  • Impedance: 4 ohms
  • Frequency Response: 55 - 20000 Hz
  • Sensitivity: 84 dB
  • Grilles included
  • 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 FSB216 thumbnail
(newest, current model)
MB Quart FSA-216 thumbnail
(previous model, replaced by MB Quart FSB216)
MB Quart ESA-216 thumbnail
(previous model, replaced by MB Quart FSA 216)

Specifications & Details

Speaker Specifications
Formula Series
Priced Per
Speaker Size
2-way Component System
Tweeter Design
Tweeter Composition
Woofer Composition
Woofer Surround
Butyl Rubber
Peak Power Handling
140 watts
RMS Power Handling
70 watts
Total PEAK Per Pair/Set
280 watts
Total RMS Per Pair/Set
140 watts
84 dB
Frequency Response
55 - 20000 Hz
Impedance (Per Voice Coil)
4 ohms
Shallow Mount Installation
Magnet Type
Top-Mount Depth (Mounting Depth)
Number of Speakers
2 Woofers + 2 Tweeters
CTA-2031 Compliant
General specifications
Marine Certified
Hi-Res Certified
Speaker Grilles
What is in the box?
User manual
Warranty/Registration card
WITB: Speakers
Speakers (2)
Tweeters (2)
Crossover networks (2)
Mounting screws (8)
Mounting clips (8)
Warranty and Return Policy
Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider

Item Details


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Customer Ratings & Reviews

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Customer Reviews

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Best OEM substitute for MBZ

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.

By F00DY on March 23, 2012


found this helpful.


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.

By Customizer on July 31, 2012


found this helpful.

You get what you pay for

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.

By swest on January 11, 2012


found this helpful.

Pretty Good

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.

By Derek on April 16, 2013


found this helpful.


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

By Jace on April 26, 2013


found this helpful.

great balance of mids and highs

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.

By Awwjard on February 10, 2013


found this helpful.

Excellent value and performance

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.

By Roberto on May 30, 2012


found this helpful.

Top quality

Bass hits nice and deep, while highs are crystal clear

By Joe on April 10, 2012


found this helpful.

Good value for money

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.

By lkoh on November 16, 2011


found this helpful.

MB Quartz

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.

By Ben on April 25, 2012


found this helpful.


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