MB Quart FKB168 6x8 Coaxial Car Speakers

MB Quart FKB168 6x8 Coaxial Car Speakers — image 1
MB Quart FKB168 6x8 Coaxial Car Speakers — image 2
MB Quart FKB168 6x8 Coaxial Car Speakers — image 3
MB Quart FKB168 6x8 Coaxial Car Speakers — image 4
79%
21%
84%
Sound Clarity
53%
Bass Performance
87%
Build Quality
91%
Value for Money
88%
Ease of Installation
86%
High-Frequency Detail
82%
Midrange Performance
79%
Durability
77%
Fit & Compatibility
67%
Power Handling
68%
Soundstage & Imaging
81%
Mounting & Seal
78%
Brand Reputation
More

Overview

The MB Quart FKB168 6x8 Coaxial Car Speakers sit comfortably in the mid-range upgrade territory — a solid choice for anyone peeling out worn or underwhelming factory speakers. MB Quart carries German audio heritage and has built a reputation for punching above its weight at accessible price points, which matters here. A standout practical detail: dual-fit sizing compatibility means these drop into both 5x7 and 6x8 cutouts, covering a wide range of vehicles without adapter plates. With a 4.3-star average across more than 200 ratings, the reception is genuinely positive — but to be clear, this is a strong daily driver, not a dedicated audiophile system.

Features & Benefits

The aluminum dome tweeter is where these MB Quart coaxial speakers genuinely stand out at this price. Aluminum handles high frequencies with more precision than the mylar tweeters found in most budget options — vocals and cymbals come through noticeably cleaner. The butyl rubber surround is a meaningful upgrade over foam, resisting heat and humidity far better, which matters if your car bakes in summer sun. The polypropylene cone is lightweight, helping the midrange respond quickly without muddiness at moderate volumes. One important clarification: the 100W power figure is a peak rating, not continuous RMS — so expect honest real-world output well below that ceiling. The textured ABS gasket helps create a rattle-free flush mount.

Best For

This 6x8 speaker pair is a natural fit for the daily commuter who wants noticeably better sound without touching their head unit, adding an amp, or running new wiring. Vehicles with factory 5x7 or 6x8 cutouts — Ford F-150s, Jeep Wranglers, and Mazda 6s among the most common — can often accept these as a direct drop-in swap. Listeners who care most about vocal clarity and clean mids will appreciate what this pair delivers; those chasing deep, room-filling bass will want a subwoofer alongside. DIY installers doing a basic speaker replacement will find the process about as straightforward as it gets.

User Feedback

Buyers consistently praise the FKB168 set for how noticeably it outperforms factory speakers right out of the box, with many pointing to improved vocal clarity and a solid, well-built feel when handling the speakers before install. Installation feedback is largely positive too — most report a clean fit without trimming or adapters. The most common complaint is predictable and honest: bass response is modest, as you would expect from a 5-inch woofer running off a stock head unit. That is not a flaw so much as a physics reality. A handful of buyers note occasional grille or bracket fit quirks on specific vehicles. Long-term durability reports are generally encouraging after a year or more of use.

#Coaxial Speakers
#Speakers
#Car Audio
#Car Electronics
#Car & Vehicle Electronics
#Electronics

Pros

  • Dual 5x7 and 6x8 compatibility makes these a drop-in fit for a wide range of popular vehicle models.
  • Aluminum dome tweeters deliver noticeably cleaner highs than the mylar alternatives found on cheaper coaxial speakers.
  • Butyl rubber surrounds resist heat and moisture degradation far better than foam, adding meaningful long-term durability.
  • Vocal clarity and midrange detail are strong for this price tier, especially running off a stock head unit.
  • Installation is straightforward for a DIY swap, with a textured ABS gasket that creates a clean, rattle-free seal.
  • Over 200 buyer ratings averaging 4.3 stars reflect consistent, reliable performance across a wide range of vehicles.
  • The lightweight polypropylene cone responds quickly at moderate volumes, keeping sound clean without audible distortion.
  • Sold as a pair, the FKB168 set delivers solid build quality at a price point most buyers find easy to justify.

Cons

  • Bass output is modest at best — listeners who want real low-end presence will need a separate subwoofer.
  • The 100W rating is a peak figure, not continuous RMS, which can mislead buyers into mismatched amplifier pairings.
  • Not waterproof, making these MB Quart coaxial speakers unsuitable for convertibles, open-bed trucks, or off-road builds.
  • Some buyers report grille bracket or adapter fit quirks on specific vehicle makes, requiring extra research before purchasing.
  • Coaxial design limits soundstage precision compared to component speaker setups available at a similar price point.
  • The limited manufacturer warranty offers minimal long-term coverage, which is worth noting for higher-power or heavy-use installs.
  • Frequency response starting at 46 Hz means the lowest bass octaves are simply off the table without subwoofer support.

Ratings

Our AI rating system analyzed hundreds of verified buyer reviews for the MB Quart FKB168 6x8 Coaxial Car Speakers — actively filtering out suspected bot submissions, incentivized posts, and unverified purchases to surface what real owners actually experience day to day. The scores below reflect a transparent, unvarnished balance of genuine strengths and recurring pain points, drawn from drivers across a wide range of vehicles, climates, and listening habits. Whether this 6x8 speaker pair earns a place in your build or falls short of what you need, the data tells the full story.

Sound Clarity
84%
For a speaker running off an unmodified factory head unit, the overall clarity is a genuine step above what most drivers have experienced from their stock setup. Vocals sit cleanly in the mix, dialogue in spoken-word content is noticeably more intelligible, and the separation between instruments at moderate volumes is consistently praised by daily commuters.
Clarity starts to thin out at higher volumes, with some listeners reporting a slight edge to the sound when pushed near the head unit's output ceiling. Those with more discerning ears or experience with component speaker systems may find the soundstage narrow and the imaging somewhat diffuse compared to pricier setups.
Bass Performance
53%
47%
For a coaxial speaker of this physical size, the low-mid punch is respectable and adds genuine warmth to acoustic and vocal-heavy tracks. Buyers whose playlists lean toward podcasts, classic rock, or country find the overall frequency balance perfectly acceptable without a subwoofer in the system.
This is the single most common complaint across buyer feedback — a 5-inch woofer simply cannot produce the low-frequency output that bass-focused listeners expect. Hip-hop, EDM, and heavy electronic genres will sound thin and underwhelming without a dedicated subwoofer paired alongside, and that is not a gap EQ adjustments can meaningfully close.
Build Quality
87%
Buyers consistently remark on how solid the FKB168 set feels the moment it comes out of the box — a noticeable contrast to the lightweight, plasticky construction of typical budget coaxials. The butyl rubber surround, aluminum dome tweeter, and high-temperature cone adhesive all communicate a level of material investment that feels unusual at this price tier.
A consistent subset of buyers has noted that the grille mounting tabs feel less robust than the speaker body itself and can bend during installation if handled forcefully. The ABS gasket, while functional, shows surface scuffing after extended use in vehicles with tighter or irregularly shaped mounting locations.
Value for Money
91%
Across hundreds of reviews, the price-to-performance ratio is the most frequently cited reason buyers recommend this 6x8 speaker pair to others. Getting aluminum dome tweeters, butyl rubber surrounds, and a German-heritage audio brand all in one package at this price point is genuinely difficult to match within the same category.
Buyers who stretch into the next price bracket sometimes find that a modest additional spend unlocks component setups with meaningfully better staging and power handling. For the purely bass-focused buyer, the value proposition weakens noticeably — satisfying low-end output still requires a separate subwoofer investment on top.
Ease of Installation
88%
The dual 5x7 and 6x8 compatibility eliminates the need for adapter rings across a wide range of vehicles, and the textured ABS gasket creates a clean, secure seal against door or deck mounting surfaces. DIY installers report completing both speakers in under two hours in most common vehicle applications.
A handful of buyers encountered fitment friction in specific vehicles — particularly around factory grille clip alignment and speaker depth clearance in shallower door cavities. These are vehicle-specific edge cases rather than a design flaw, but they are worth researching for your particular model before committing to the purchase.
High-Frequency Detail
86%
The aluminum dome tweeter is the standout performer, delivering crisp, detailed highs that handle cymbal shimmer, string instruments, and female vocals with a clarity well above the mylar tweeters found on competing speakers at the same price. Long-distance highway listening at moderate volume is where this advantage shows most clearly.
At high output levels, the tweeter can take on a slightly brittle edge — particularly noticeable on compressed streaming-quality audio where sibilance is already present in the source material. Listeners sensitive to harsh highs may benefit from applying a small treble reduction on their head unit's EQ settings.
Midrange Performance
82%
18%
The polypropylene cone handles the midrange with a lightness and speed that benefits acoustic guitar, piano, and most vocal genres noticeably. At typical in-car listening volumes — roughly 40 to 70 percent of the head unit's range — the midrange sounds open and natural, which is exactly what daily commuters prioritize.
When bass-heavy tracks push the cone to work outside its comfort zone, the midrange can sound slightly congested, with lower-mid frequencies masking some of the cleaner detail the speaker produces on simpler recordings. This is a structural limitation of the coaxial format rather than a manufacturing defect, but it is audible.
Durability
79%
21%
Most buyers who revisit their reviews after extended ownership report that these MB Quart coaxial speakers are still performing well after 12 to 24 months of regular daily use. The butyl rubber surround and thermally stable cone adhesive both contribute to a durability profile that holds up better than average at this price level.
Long-term data past the two-year mark is limited in the available review pool, making it hard to assess how these speakers age over several years. A small number of buyers in very hot climates report gradual tonal changes over time, suggesting prolonged heat stress may accelerate component fatigue in extreme conditions.
Fit & Compatibility
77%
23%
The dual-size compatibility works as advertised across the most common 5x7 and 6x8 applications, with many buyers confirming a clean no-adapter fit in Ford, Jeep, and Mazda platforms without any modification. This flexibility makes the purchasing decision straightforward for a large portion of the mainstream car audio upgrade market.
Compatibility becomes less consistent in older or less common vehicle models, where non-standard mounting depths or unusual grille retention systems complicate what should be a simple swap. Buyers in vehicles outside the major domestic and Japanese platforms should verify exact fitment details carefully before purchasing.
Power Handling
67%
33%
For buyers running these off a stock head unit — which typically outputs 15 to 22 watts RMS per channel — the speakers handle the load comfortably and reproduce audio cleanly without distortion at normal listening levels. The 100W peak ceiling provides an adequate buffer for the moderate demands of factory system output.
The advertised 100W figure is a peak rating, and the actual continuous RMS handling is not separately published, creating a real gap in expectation for buyers planning to pair these with an aftermarket amplifier. Running an amp without careful gain calibration risks pushing the speakers into distortion or causing long-term driver fatigue.
Soundstage & Imaging
68%
32%
Relative to other coaxial speakers at this price, the stereo separation is decent and creates a reasonably convincing left-right image when installed in standard front door positions. Buyers upgrading from very basic factory speakers notice a clear widening of the perceived sound field on familiar recordings.
Coaxial architecture has inherent limits for soundstage depth and precise instrument placement — qualities that component setups with separate tweeter pods deliver far more convincingly. Critical listeners will find the imaging flat, with most of the perceived sound anchored to the door panels rather than projecting across the dashboard.
Mounting & Seal
81%
19%
The textured ABS gasket compresses evenly against factory mounting flanges in most vehicles, virtually eliminating the panel buzzes and loose-fit rattles that often accompany cheaper speaker installations. Installers working across multiple vehicle types report consistently snug, clean fits on a wide range of mounting surfaces and panel materials.
In a small number of installations — particularly vehicles with unusually thin door sheet metal — buyers report uneven gasket compression that requires shimming for a fully rattle-free result. The gasket material does not compress as readily as foam alternatives, which can be a minor but frustrating challenge in tight mounting situations.
Brand Reputation
78%
22%
MB Quart has a genuine heritage in audio engineering with roots in Germany, and this lineage carries real weight among car audio enthusiasts who recognize the name. Buyers who have used MB Quart products before often cite consistent build standards and sound tuning philosophy as key reasons they return to the brand.
For buyers unfamiliar with the brand, MB Quart does not carry the immediate shelf recognition of Kenwood, Pioneer, or JBL in the mass-market car audio space, which creates some initial hesitation at the point of purchase. A few buyers also note that warranty service responsiveness has been inconsistent depending on region and purchase channel.

Suitable for:

The MB Quart FKB168 6x8 Coaxial Car Speakers are an ideal upgrade for everyday drivers who are tired of the flat, lifeless sound that ships with most factory audio setups and want a meaningful improvement without hiring an installer or overhauling their entire system. If your vehicle already has 5x7 or 6x8 speaker cutouts — a layout common in Ford F-150s, Jeep Wranglers, Mazda 6s, and many other popular models — this pair slots in cleanly as a direct replacement with minimal fuss. Listeners who care most about vocal clarity, crisp highs, and cleaner overall reproduction at normal daily-listening volumes will notice a genuine step up from stock. Budget-conscious buyers wanting a real, audible difference without a large investment will find the value proposition here hard to argue with. DIY installers comfortable with a basic speaker swap will also appreciate how manageable the process is, thanks to the textured ABS gasket and standard mounting footprint.

Not suitable for:

Listeners whose primary goal is deep, powerful bass should look elsewhere — the 5-inch woofer in this 6x8 speaker pair simply cannot move enough air to satisfy anyone chasing serious low-end impact, and without a dedicated subwoofer in the system, that gap will be noticeable. Car audio enthusiasts building a more ambitious setup around an external amplifier and active crossovers will find the coaxial design limiting, as it cannot match the soundstage precision or flexibility of a quality component speaker system at a comparable spend. Buyers planning to drive these with a high-powered aftermarket amp should also know that the advertised 100W figure is a peak number, not a continuous RMS rating — misreading that distinction and pushing too much power risks damaging the drivers. Anyone with a vehicle regularly exposed to rain or moisture — convertibles, open-bed trucks, serious off-road rigs — will want a waterproof-rated option instead, as these speakers carry no such protection. If bass-heavy listening is the priority and a subwoofer is not part of the plan, the FKB168 set will likely leave that buyer underwhelmed.

Specifications

  • Speaker Type: 2-way coaxial design with woofer and tweeter mounted on a single axis for simplified installation.
  • Fit Size: Dual-compatible with both 5x7″ and 6x8″ speaker cutouts, covering a wide range of factory automotive mounting locations.
  • Peak Power: Rated at 100W peak power handling; this is not a continuous RMS figure, and real-world sustained capacity is meaningfully lower.
  • Tweeter: 1-inch aluminum dome tweeter delivers clean high-frequency reproduction with improved rigidity over standard mylar alternatives.
  • Woofer Diameter: The woofer measures 5 inches in diameter and handles mid-bass and midrange frequencies within the coaxial assembly.
  • Cone Material: Lightweight thermal-formed polypropylene cone enables faster midrange response and maintains structural rigidity under varying temperature conditions.
  • Surround Material: Butyl rubber surround resists heat and humidity degradation, offering superior longevity compared to foam surround alternatives.
  • Gasket Material: Textured ABS plastic gasket creates a rigid, linear seal against the mounting surface to minimize rattles and vibration transfer.
  • Frequency Response: Frequency response begins at 46 Hz on the low end, suited to midrange and high-frequency reproduction within a full-range system.
  • Configuration: Sold as a stereo pair in a 2.0 channel configuration, with one speaker intended for each left and right channel.
  • Driver Type: Dynamic driver technology converts electrical audio signals into sound through mechanical cone and voice coil movement.
  • Shape: Elliptical form factor is designed to fit the elongated speaker openings common in automotive door and rear deck installations.
  • Item Weight: The complete pair weighs approximately 3.4 pounds, making handling and single-person installation straightforward.
  • Waterproof Rating: No waterproof rating is assigned; these speakers are not suitable for direct water exposure or open-air vehicle installations.
  • Warranty: Covered by a limited manufacturer warranty; buyers should confirm specific terms directly with MB Quart or their point of purchase.
  • Power Source: Operates on DC power drawn directly from the vehicle electrical system via standard automotive speaker wiring connections.

Related Reviews

MB Quart FKB116 6.5-Inch Coaxial Car Speakers
MB Quart FKB116 6.5-Inch Coaxial Car Speakers
75%
83%
Sound Clarity
58%
Bass Response
81%
Treble Performance
78%
Midrange Quality
74%
Build Quality
More
MB Quart FKB146 4x6 Inch Coaxial Car Speakers
MB Quart FKB146 4x6 Inch Coaxial Car Speakers
74%
78%
Sound Clarity
54%
Bass Performance
86%
Value for Money
91%
Installation Ease
67%
Build Quality
More
MB Quart FKB169 6x9-Inch Coaxial Car Speakers
MB Quart FKB169 6x9-Inch Coaxial Car Speakers
79%
81%
Sound Quality
84%
Treble Clarity
74%
Mid-Bass Response
86%
Build Quality
83%
Durability & Longevity
More
Alphasonik AS68 6x8 Car Speakers
Alphasonik AS68 6x8 Car Speakers
69%
83%
Value for Money
71%
Sound Clarity
58%
Bass Performance
88%
Installation Ease
84%
Vehicle Compatibility
More
JBL GX8628 6×8″ Coaxial Car Speakers
JBL GX8628 6×8″ Coaxial Car Speakers
78%
83%
Sound Clarity
57%
Bass Performance
78%
Treble & High-Frequency Detail
89%
Value for Money
81%
Build Quality
More
Kicker 40CS684 6x8-inch Car Coaxial Speakers
Kicker 40CS684 6x8-inch Car Coaxial Speakers
77%
83%
Sound Clarity
57%
Bass Response
89%
Installation Ease
81%
Value for Money
74%
Build Quality
More
Orion CB683 6x8″ 3-Way Coaxial Car Speakers
Orion CB683 6x8″ 3-Way Coaxial Car Speakers
73%
74%
Sound Quality
71%
Bass Performance
62%
Treble Clarity
66%
Midrange Definition
69%
Build Quality
More
Cerwin-Vega V68 6x8 Coaxial Car Speakers
Cerwin-Vega V68 6x8 Coaxial Car Speakers
78%
84%
Sound Quality
81%
Bass Performance
86%
Value for Money
67%
Installation Ease
88%
Sensitivity & Efficiency
More
Hifonics Zeus ZS5768CX 5x7/6x8″ 2-Way Car Audio Coaxial Speakers
Hifonics Zeus ZS5768CX 5x7/6x8″ 2-Way Car Audio Coaxial Speakers
85%
87%
Sound Quality
88%
Bass Performance
82%
Ease of Installation
90%
Durability
75%
Fitment Compatibility
More
NVX NSP68 6x8 Car Coaxial Speakers
NVX NSP68 6x8 Car Coaxial Speakers
75%
83%
Sound Clarity
51%
Bass Performance
81%
High-Frequency Response
88%
Installation Ease
79%
Value for Money
More

FAQ

This 6x8 speaker pair is designed to fit both 5x7 and 6x8 inch openings, which covers a large number of popular vehicles including many Ford, Jeep, and Mazda models. That said, it is always worth confirming your specific year, make, and model against a fit guide before ordering, since door cavity depth and grille compatibility can vary even within the same vehicle line.

No — these speakers are designed to run directly off a factory or aftermarket head unit without any additional amplification. Most buyers connect them straight into existing wiring and notice an immediate improvement over stock. If you plan to add an amp later, just be careful with gain settings, since the 100W figure is a peak rating and the actual continuous power threshold is considerably lower.

Honest answer: the bass is decent for a coaxial speaker at this price point, but it will not rattle your windows. A 5-inch woofer has physical limits, and without a separate subwoofer, deep low-frequency extension is not really available. For most music genres they sound full and balanced, but dedicated bass listeners will want to pair them with a sub for serious low-end output.

For anyone comfortable removing door panels and swapping speaker connectors, this is a fairly routine job. The elliptical shape fits cleanly into most standard factory cutouts in this size class, and the textured gasket seats well against the mounting surface without much fuss. Expect roughly 30 to 60 minutes per side depending on how accessible your specific vehicle's door panels are.

In most cases, yes — and often by a meaningful margin. Factory speakers in this size range are typically built to a very low cost threshold, so the aluminum dome tweeter alone makes vocals and higher-frequency instruments sound considerably cleaner. Buyers who have never upgraded car speakers before are usually surprised at how much of a difference a quality replacement makes.

The butyl rubber surround is a real advantage here. Foam surrounds — common on cheaper speakers — tend to crack or deteriorate after a few summers baking in a hot car interior. Butyl rubber holds up significantly better through repeated heat cycles and high humidity, so these MB Quart coaxial speakers should age more gracefully than budget alternatives in warm-climate conditions.

No, the MB Quart FKB168 6x8 Coaxial Car Speakers carry no waterproof rating and are not designed for direct moisture exposure. They are intended for standard enclosed-cabin vehicles where the speakers stay protected and dry. If you drive a convertible, a serious off-road build, or any vehicle where the speaker location could get wet, a marine-rated or purpose-built waterproof speaker is the right choice instead.

That figure is a peak number — a brief maximum the speaker can technically handle under ideal conditions, not a level it is built to sustain continuously. The actual RMS continuous power rating is not separately specified but will be meaningfully lower. For stock head unit use this distinction rarely causes problems, but if you are running a dedicated amplifier, matching gain settings carefully is important to avoid stressing the drivers over time.

Buyer feedback on longevity is generally encouraging, with many reporting solid, consistent performance after a year or two of regular daily use. The butyl rubber surround and high-temperature cone adhesive both contribute to durability over time. As with any car speaker, the most common causes of early failure are excessive power, prolonged extreme heat, or physical damage — not normal age and wear under typical conditions.

In most cases, no. If your vehicle already has 5x7 or 6x8 cutouts and standard speaker wiring, the FKB168 set should drop in without additional mounting hardware or adapters. Some owners prefer to use a plug-and-play wiring harness adapter to avoid cutting factory connectors, which keeps the install clean and reversible. Certain factory grilles or speaker covers may also not align perfectly depending on trim level, so a quick check on owner forums for your specific vehicle model is a smart step before starting the job.

Where to Buy

Newegg.com
MB Quart FKB168 6x8 Coaxial Car Speakers
In stock $42.95
Buy Now
eBay
MB Quart FKB168 6x8 Coaxial Car Speakers
In stock $44.95
Buy Now