KICKER KSC6704 6-3/4″ Coaxial Car Speakers

79%

21%

Vocal & Midrange Clarity

Treble & High-Frequency Response

Bass Response

Ease of Installation

Factory Grille Fitment

Sound Quality at Volume

Build Quality & Materials

Value for Money

Compatibility

Stereo Imaging

Package Contents

Brand Reputation

Noise & Distortion

Overview

The KICKER KSC6704 6-3/4″ Coaxial Car Speakers represent a solid option from a brand that has spent decades building credibility in the car audio world. These KICKER coaxials are designed around the idea of a clean, hassle-free factory replacement — you remove the tired OEM speakers, drop these in, and the difference is immediately audible. The silk dome tweeter sits low enough to clear factory grilles without trimming or bracket modifications, which matters more than most buyers realize. Running at 4 ohms, they pair naturally with stock head units as well as entry-level aftermarket receivers, keeping the upgrade path genuinely straightforward.

Features & Benefits

What sets the KSC6704 speakers apart from cheaper coaxials is not headline power numbers — it is the quality of the silk dome tweeter. Piezo tweeters, common in budget speakers, tend to sound harsh and fatiguing over long drives; the silk dome alternative rolls off the top end more naturally, which pays dividends on vocal-heavy tracks and acoustic music. Installation is about as simple as it gets: the flush-mount design drops into any standard 6-3/4-inch opening, the included grilles mean you will not need to source extras, and a single wired connection per side covers all the wiring. No external crossovers, no head-scratching.

Best For

This speaker upgrade makes the most sense for drivers who want a meaningful improvement over factory audio without committing to a full system overhaul. If your current speakers sound thin, distorted at moderate volumes, or simply dated, the KSC6704 speakers deliver a noticeable step up in clarity — especially in the midrange and treble. They are particularly well-suited to vehicles with confined door panels where a high-profile tweeter would cause fitment problems. Commuters who spend a lot of time with podcasts, talk radio, or acoustic music will get more out of these than bass-focused listeners will, so manage expectations accordingly.

User Feedback

Owners of these KICKER coaxials consistently praise how much cleaner vocals sound compared to factory speakers, and many note how painless the installation was — a recurring theme in reviews from Toyota, Honda, and Jeep owners specifically. On the downside, buyers expecting deep bass are regularly disappointed, though that is a physics reality for coaxials of this size rather than a product-specific shortcoming. A handful of reviewers flag long-term durability as an open question past the one-year mark. Stacked against rivals like Rockford Fosgate or JBL at a comparable price, these speakers trade a slight bass advantage for a noticeably smoother treble.

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#Car Audio

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Pros

Vocal clarity improvement over factory speakers is immediately noticeable, even on a stock head unit.
Silk dome tweeter sounds smoother and less fatiguing on long drives than cheaper piezo alternatives.
Low-profile tweeter fits cleanly behind OEM grilles in most vehicles — no trimming or adapters needed.
Flush-mount design drops into standard 6-3/4-inch openings without cutting new holes.
Grilles are included in the box, so there are no surprise accessory costs after purchase.
Compatible with factory receivers and entry-level aftermarket head units right out of the box.
Installation is straightforward enough for first-timers with basic hand tools.
KICKER is a well-established brand with a track record in car audio, not a generic import label.

Cons

Bass extension is limited — low-end listeners will need a separate subwoofer to fill the gap.
Long-term durability beyond one year is not well-documented in user reviews, raising some uncertainty.
No waterproofing makes these unsuitable for convertibles or any install with moisture exposure risk.
At this price point, rivals like Rockford Fosgate offer slightly punchier bass response in the same size class.
Component speaker setups at a similar budget will outperform these in soundstage and stereo separation.
The limited warranty provides basic coverage but may not inspire confidence for a multi-year installation.
Power handling headroom is modest — pairing with a high-output amplifier will not unlock dramatic gains.

Ratings

Our AI rating engine analyzed verified global buyer reviews for the KICKER KSC6704 6-3/4″ Coaxial Car Speakers, actively filtering out incentivized, bot-generated, and outlier feedback to surface what real owners consistently experience. The scores below reflect both where these speakers genuinely impress and where they fall short, with no glossing over the trade-offs that matter most to daily drivers and first-time upgraders.

Vocal & Midrange Clarity

88%

Commuters and podcast listeners repeatedly single out the midrange as the clearest upgrade over factory speakers. Voices sound more present and defined, whether it is a talk radio host or a lead vocal on an acoustic track, and the improvement is noticeable within the first few minutes of driving.

At higher volumes the midrange can feel slightly forward or pushed, which some listeners find tiring on longer highway stretches. It is a minor trade-off, but listeners who prefer a more laid-back, recessed midrange tuning may need time to adjust.

Treble & High-Frequency Response

83%

The silk dome tweeter consistently draws praise for sounding natural rather than sharp or brittle — a real differentiator at this price point. Cymbal detail and acoustic guitar fingerpicking come through without the harsh edge that cheaper piezo tweeters typically introduce.

A small subset of users finds the upper treble slightly rolled off compared to more expensive component tweeters, meaning some very fine detail in complex orchestral or hi-res audio tracks does not fully resolve. This is unlikely to bother casual listeners but may frustrate audiophiles.

Bass Response

54%

46%

For a coaxial of this size, the low-midrange punch is reasonably satisfying on pop and rock tracks, and the transition between the woofer and tweeter is handled smoothly enough that the overall sound does not feel hollow or disjointed.

Buyers expecting meaningful bass output are frequently disappointed — deep low-end simply does not materialize without a dedicated subwoofer. This is a physics limitation of the driver size, not a brand-specific flaw, but it remains the most common source of negative reviews and should be planned around.

Ease of Installation

91%

The flush-mount design and standard 6-3/4-inch footprint make these a genuine drop-in fit in a wide range of vehicles, and the included grilles mean there is nothing extra to source. First-time installers with basic tools consistently report completing the swap in under two hours per vehicle.

A handful of owners have noted that the wiring harness connectors can be slightly stiff on certain factory plugs, requiring careful alignment to seat properly. In a small number of vehicle-specific cases, minor bracket shimming is needed to eliminate speaker rattle against door panels.

Factory Grille Fitment

87%

The low-profile tweeter is one of the most practically useful design choices on these speakers. In vehicles with shallow door cavities — Jeep Wranglers and certain Honda models come up frequently — the reduced tweeter height is the difference between a clean install and one that physically cannot close the door panel.

A few owners with unusually deep OEM grille structures have still encountered light contact between the tweeter and the grille mesh. It is not a widespread issue, but buyers with uncommon or aftermarket door panels should measure the available depth before committing.

Sound Quality at Volume

72%

28%

At moderate listening levels — the kind most daily drivers actually use — these KICKER coaxials maintain good composure and do not distort noticeably. Music stays coherent and intelligible, which is all most commuters genuinely need from a factory-replacement set.

Push the volume higher without an external amplifier and the sound starts to compress and lose definition, particularly in the low end. Users who like to drive loud on the highway with a stock head unit will hit this ceiling fairly quickly.

Build Quality & Materials

74%

26%

The physical construction feels solid for the price tier — the basket and cone materials are clearly a step above the flimsy OEM plastic found in most factory speakers. The silk dome tweeter housing in particular feels well-assembled and does not exhibit any loose rattling out of the box.

Long-term durability data is thin since the product launched in 2020, and a handful of reviewers report issues appearing after 18 months of use. The materials are adequate for the price but do not inspire the same confidence as heavier-duty builds from KICKER's own higher-tier lines.

Value for Money

81%

19%

For what these speakers deliver — a genuine, immediately audible upgrade over factory audio with a painless install — most buyers feel the price is well justified. The included grilles add tangible practical value that budget alternatives often skip.

Rivals like JBL and Rockford Fosgate offer competitive options at similar or slightly lower price points, which means these KICKER coaxials are not the only smart choice in the segment. Buyers who shop around carefully may find comparable sound with a better warranty or more bass output elsewhere.

Compatibility

89%

The 4-ohm impedance rating covers almost every factory head unit and entry-level aftermarket receiver on the market, which removes a common source of buyer anxiety. Owners across dozens of different vehicle makes confirm plug-and-play compatibility without any impedance-related issues.

Compatibility with premium OEM audio systems — like Bose or Bang and Olufsen factory installs — is less straightforward and may require an impedance adapter or line output converter. Buyers with these factory premium systems should research their specific setup before purchasing.

Stereo Imaging

63%

37%

For casual listening in a standard door speaker placement, the stereo separation is pleasant and instruments have enough spatial separation to make music feel three-dimensional rather than flat. Podcasts and spoken word content in particular benefit from the clear center-channel presence.

Coaxial designs are inherently limited in soundstage width and depth compared to properly positioned component setups, and the KSC6704 speakers are no exception. Listeners who care about precise imaging or wide soundstage — common among audiophile-leaning buyers — will hit this ceiling regardless of tuning.

Package Contents

84%

Including both speakers and both grilles in the box is a small but meaningful touch that budget alternatives often overlook. It saves the buyer an extra shopping trip and ensures the grille aesthetic matches the speaker hardware cleanly.

There are no wire harness adapters or installation hardware included, so buyers without vehicle-specific harness connectors will need to source those separately. For true beginners, the absence of any printed quick-start guide can make the first install feel slightly more uncertain than it needs to be.

Brand Reputation

86%

KICKER has been a recognized name in car audio for decades, and that heritage provides real reassurance when buying mid-range speakers online. Buyers who have owned previous KICKER products often return specifically because of consistent quality expectations across the brand.

The brand reputation, while strong, does create elevated expectations that the KSC6704 does not always fully meet — particularly around bass output and long-term durability, where some buyers feel the KICKER name implies more than this specific model delivers.

Noise & Distortion

77%

23%

At normal listening volumes the speakers stay clean and composed, with no audible buzzing, rattling, or cone breakup that would indicate poor construction. This is particularly appreciated by buyers replacing speakers that had developed a persistent rattle or crackle.

A small number of buyers report developing a subtle buzz or panel resonance after several months of use, particularly on bass-heavy tracks. This appears to be an installation fit issue in some cases, but it has occurred with enough frequency to be a credible concern rather than an isolated outlier.

Suitable for:

The KICKER KSC6704 6-3/4″ Coaxial Car Speakers are a strong match for everyday drivers who are frustrated with the thin, lifeless sound of aging factory speakers and want a real improvement without tearing apart their dash or hiring an installer. If your vehicle already has 6-3/4-inch speaker cutouts — common in a wide range of Toyotas, Hondas, Jeeps, and GM trucks — these drop in without modification, which makes the whole project approachable even for someone who has never swapped speakers before. Commuters and long-haul drivers who spend hours listening to podcasts, talk radio, or acoustic-heavy playlists will notice the clearest benefit, since the silk dome tweeter handles vocals and instruments with noticeably less harshness than stock. They also work well for anyone running a factory head unit or a budget aftermarket receiver, since the 4-ohm load is universally compatible. Essentially, if your goal is a cleaner, more pleasant daily listening experience with a Saturday-afternoon install, this speaker upgrade delivers exactly that.

Not suitable for:

If you are building a system around deep bass or high-volume output, the KICKER KSC6704 6-3/4″ Coaxial Car Speakers are probably not the right centerpiece. Coaxials of this size simply cannot move enough air to produce satisfying low-end on their own — that is a physics constraint, not a brand flaw, and no amount of amplification will fully compensate for the lack of a dedicated subwoofer. Serious audio enthusiasts who prefer component speaker setups with separate woofers and tweeters will find the coaxial format limiting in terms of soundstage and precise imaging. These speakers are also not waterproof, so open-air vehicles, boats, or installations near windows with frequent moisture exposure are a poor match. And if you are comparing options at the higher end of the car audio market, competing brands offer component sets with more refined crossover networks and better long-term durability data — worth considering if you plan to keep the same speakers for five or more years.

Specifications

Speaker Size: Each driver measures 6-3/4″ (17.15 cm) in diameter, fitting standard OEM and aftermarket 6-3/4-inch mounting locations.
Peak Power: The pair handles up to 400W peak combined, though real-world listening levels are governed by the more meaningful RMS rating.
RMS Power: Continuous RMS power handling is 100W for the pair, which aligns comfortably with most factory and entry-level aftermarket head units.
Impedance: Both speakers are rated at 4 ohms, making them broadly compatible with stock receivers and aftermarket amplifiers without any impedance mismatch concerns.
Speaker Type: Full-range coaxial design combines the woofer and tweeter into a single unit, eliminating the need for a separate crossover or component mounting.
Tweeter Type: A 0.75″ silk dome tweeter is integrated into each speaker, chosen for its smoother and more natural high-frequency rolloff compared to piezo alternatives.
Mounting Type: Flush-mount installation is standard, requiring no brackets or adapters in vehicles with existing 6-3/4-inch speaker cutouts.
Channel Config: The set operates in 2.0 stereo configuration, with one speaker designated for each channel — left and right.
In the Box: Each package includes two speakers and two matching grilles, so no additional accessories are needed to complete a basic installation.
Weight: The complete unit weighs 4.3 lbs, which is typical for a coaxial pair of this size and poses no unusual mounting challenges.
Connectivity: These are passively driven wired speakers with no Bluetooth or wireless capability — signal is delivered via standard speaker wire from the head unit or amplifier.
Waterproofing: These speakers carry no waterproof or water-resistant rating and should not be installed in locations exposed to rain, moisture, or humidity.
Warranty: KICKER provides a limited manufacturer warranty with this product; buyers should verify current terms directly with KICKER or the authorized retailer at time of purchase.
Dimensions: The packaged product measures 19 x 10 x 4 inches, a standard box size for a dual-speaker set of this class.
Model Number: The official model designation is 47KSC6704, part of KICKER's Series 47 lineup introduced in early 2020.

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FAQ

In most cases, yes — as long as your vehicle already has 6-3/4-inch speaker openings, the KSC6704 speakers drop straight in with a flush mount. Common fitment vehicles include many Toyota, Honda, Jeep, and GM models. That said, always double-check your specific year and trim using a speaker fitment guide before buying, since some factory locations use non-standard depths or brackets.

You can absolutely run them off a factory head unit. The 4-ohm impedance is exactly what OEM and entry-level aftermarket receivers are designed to drive. Adding an amplifier will give you more headroom and dynamics, but it is not required to get a noticeable improvement over stock speakers.

Grilles are included in the box — two speakers, two grilles, no extra purchases needed for a basic install.

For anyone comfortable with basic hand tools, this is a manageable weekend project. You remove the door panel, unplug the factory speaker, swap in the new one, and reconnect. The low-profile tweeter design means you will not need to modify the factory grille opening in most vehicles. Plenty of vehicle-specific tutorials are available online if you want to follow along step by step.

Not on their own. Like any 6-3/4-inch coaxial, these KICKER coaxials have real physical limits when it comes to low-end output. They handle midrange and treble well, but if deep bass is a priority, you will want to add a subwoofer to the system. Expecting otherwise from any speaker in this size and format will lead to disappointment.

No — the KICKER KSC6704 6-3/4″ Coaxial Car Speakers carry no waterproof or weather-resistance rating. Installing them anywhere with regular moisture exposure, whether in a boat or an open-top vehicle, risks premature failure. Look for marine-rated speakers if that is your use case.

All three brands are competitive in this segment. JBL options in the same size class tend to offer slightly more bass punch, while Rockford Fosgate has a similar strength-to-price positioning. These KICKER coaxials stand out for their smooth treble and low tweeter profile, which matters most in vehicles where fitment is tight. If bass is your main concern, the competition may edge ahead; for vocal clarity and clean highs, these hold their own.

For a head unit install without an external amp, 18-gauge speaker wire is generally sufficient for typical door speaker runs. If you are running longer cable lengths or adding an amplifier, stepping up to 16-gauge is a sensible precaution. Using quality wire with good insulation will help avoid any signal degradation over time.

Technically yes — the speakers are sold as a pair but each unit functions independently. That said, mixing one new speaker with a worn factory speaker on the other side will result in noticeably uneven sound. If budget allows, replacing both sides at the same time is strongly recommended for balanced stereo performance.

User feedback beyond the one-year mark is limited, so long-term durability is harder to assess than with more established models. For a daily driver in a normal climate-controlled environment, a well-installed set of these should realistically last several years. Extreme heat, high humidity, or consistent over-powering will shorten the lifespan of any speaker in this class.

Where to Buy

eBay

KICKER KSC6704 6-3/4″ Coaxial Car Speakers

In stock $100.00

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Onlinecarstereo.com

KICKER KSC6704 6-3/4″ Coaxial Car Speakers

In stock $103.96

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HiFiSoundconnection.com

KICKER KSC6704 6-3/4″ Coaxial Car Speakers

In stock $107.95

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Santa Clarita Auto Sound

KICKER KSC6704 6-3/4″ Coaxial Car Speakers

In stock $129.99

Buy Now

KICKER KSC6704 6-3/4″ Coaxial Car Speakers

Overview

Features & Benefits

Best For

User Feedback

Pros

Cons

Ratings

Vocal & Midrange Clarity

Treble & High-Frequency Response

Bass Response

Ease of Installation

Factory Grille Fitment

Sound Quality at Volume

Build Quality & Materials

Value for Money

Compatibility

Stereo Imaging

Package Contents

Brand Reputation

Noise & Distortion

Suitable for:

Not suitable for:

Specifications

Related Reviews

FAQ

Will these fit my car without any modifications?

Can I run these off my stock head unit, or do I need an amplifier?

Do these come with grilles, or do I need to buy them separately?

How hard is it to install these myself?

Will these speakers produce strong bass?

Are these speakers waterproof? Can I use them in a boat or a Jeep with no doors?

How do these compare to JBL or Rockford Fosgate speakers at a similar price?

What wire gauge should I use when installing these?

Can I use just one speaker if I only need to replace one side?

How long do these speakers typically last?

Where to Buy