KICKER 51KSC6904 KS-Series 6x9 Coaxial Speakers

KICKER 51KSC6904 KS-Series 6x9 Coaxial Speakers — image 1
KICKER 51KSC6904 KS-Series 6x9 Coaxial Speakers — image 2
KICKER 51KSC6904 KS-Series 6x9 Coaxial Speakers — image 3
KICKER 51KSC6904 KS-Series 6x9 Coaxial Speakers — image 4
KICKER 51KSC6904 KS-Series 6x9 Coaxial Speakers — image 5
KICKER 51KSC6904 KS-Series 6x9 Coaxial Speakers — image 6
KICKER 51KSC6904 KS-Series 6x9 Coaxial Speakers — image 7
KICKER 51KSC6904 KS-Series 6x9 Coaxial Speakers — image 8
KICKER 51KSC6904 KS-Series 6x9 Coaxial Speakers — image 9
86%
88%
Sound Quality
94%
Ease of Installation
85%
Bass Performance
87%
Midrange Clarity
90%
Maximum Output Power
82%
Build Quality
80%
Volume Handling
93%
Fit and Compatibility
92%
Value for Money
78%
Durability
75%
Customer Support
84%
Overall Satisfaction
More

Overview

The KICKER 51KSC6904 KS-Series 6x9 Coaxial Speakers are designed to deliver a noticeable upgrade to any car audio system. These speakers promise a high-performance sound experience, offering clear midrange and deep bass, which many factory-installed options lack. Their compact design ensures they fit in most vehicles, with minimal tweeter protrusion for easy, no-modification installation. For drivers who want better audio without major customization, these speakers offer a great solution, bringing quality sound to everyday commutes or long drives.

Features & Benefits

These 6x9 coaxial speakers are built to last, with polypropylene cones and durable rubber surrounds that enhance both durability and sound clarity. Their 4-Ohm impedance, combined with a 300-watt maximum output, ensures robust sound even at high volumes. With a frequency response range of 300Hz to 20kHz, the full-range sound is impressive, and the speakers easily integrate into a wide variety of car audio systems. The minimal tweeter protrusion simplifies installation, meaning no modifications are needed, making setup quick and hassle-free.

Best For

These speakers are ideal for car audio enthusiasts looking to replace their factory-installed options. They cater to users who prioritize both sound quality and ease of installation, providing a perfect fit for vehicles that don't require complex modifications. If you're someone who values a clear balance of midrange and bass, these speakers will offer a noticeable upgrade in audio performance. They also appeal to anyone who enjoys high-quality sound without the need for a professional installation.

User Feedback

Users have praised the sound quality of these speakers, particularly the rich midrange and bass response that rivals more expensive options. Many also appreciate the simple, no-modification installation process, with most able to replace their factory speakers without any issues. However, some have noted that while the speakers excel at lower and mid-range volumes, they might not provide the same crispness at extremely high volumes. Overall, these speakers are regarded as a solid choice for anyone seeking an upgrade on a budget.

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

Pros

  • These 6x9 coaxial speakers are praised for their balanced sound, especially the clear midrange and deep bass.
  • Users appreciate the simple, no-modification installation process, making them accessible for DIYers.
  • Ideal for car owners who want a quick and easy upgrade without having to cut or modify the vehicle's interior.
  • The 300-watt maximum output power provides strong audio performance even at high volumes.
  • Many buyers report great durability, thanks to the polypropylene cones and tough rubber surrounds.
  • The compact design with minimal tweeter protrusion fits well into a wide range of vehicles without installation issues.

Cons

  • Some users feel the bass could be more pronounced, particularly for those seeking deeper, thumping low-end sounds.
  • A few reviewers mention that the midrange performance becomes less clear at higher volumes.
  • While installation is generally easy, some vehicles with specific configurations may still face fitment challenges.
  • Occasional distortion occurs at concert-like volumes, which could be a concern for users who prioritize high-volume clarity.
  • The frequency response range may not satisfy audiophiles who demand ultra-precise sound across all frequencies.
  • This speaker setup may not provide the same level of sound detail and clarity as more premium models.

Ratings

The ratings for the KICKER 51KSC6904 KS-Series 6x9 Coaxial Speakers were derived from global user reviews across multiple languages and platforms, after filtering out spam, bot, incentivized, and low-quality feedback. Both the positive and negative aspects of the product have been taken into account, reflecting a well-rounded perspective. Reviewers have shared their experiences on factors like installation ease, sound quality, and performance at different volume levels.

Sound Quality
88%
Many users appreciate the clear and balanced sound produced by these speakers, particularly in the midrange and bass. The clarity in vocal and instrument reproduction enhances the overall listening experience, making it ideal for music lovers who enjoy deep and rich sound.
However, some users mention that the treble could be sharper, and the overall sound may not be as dynamic as higher-end models. For those seeking extremely high-fidelity sound, the speakers might not meet their expectations in terms of crispness in the high frequencies.
Ease of Installation
94%
Installation is widely regarded as one of the strongest points of these 6x9 coaxial speakers. Users love the no-modification design, which allows for a quick and straightforward setup in most vehicles. The minimal tweeter protrusion ensures a hassle-free experience for those who are not keen on complex installations.
On the flip side, a few users report that although installation is easy, some vehicles may require slight adjustments for a perfect fit. While most find it simple, users with particularly tight spaces or specific car models may face minor challenges during installation.
Bass Performance
85%
The bass performance stands out for providing solid, deep low-end sounds that enhance the overall listening experience. Many reviewers find that these speakers deliver powerful bass that fills the vehicle without distorting, making them an excellent choice for bass-heavy genres like hip-hop and rock.
Some buyers feel that while the bass is good, it may not be as punchy or pronounced as some more premium speakers. Enthusiasts who prioritize ultra-deep bass for competitive audio setups might not find these speakers to meet their more demanding expectations.
Midrange Clarity
87%
The midrange clarity of these 6x9 coaxial speakers is praised by users for bringing out vocals and instruments clearly without muddiness. The balance between the midrange and bass makes for a rich and full sound, making them a great option for listeners who enjoy a wide range of music genres.
However, some users note that the midrange could be more pronounced, especially in higher volumes. Those who are particularly sensitive to audio detail may feel that certain elements like vocal sharpness could use more presence in the mix.
Maximum Output Power
90%
With a maximum output power of 300 Watts, these speakers can handle high volume levels without distortion. Users who enjoy playing music at loud volumes are particularly impressed with how well the speakers perform, providing clear sound even at concert-like levels.
That said, some users who prefer a more controlled listening experience feel that the power might be excessive for smaller vehicles or more casual listening environments. These speakers may not be ideal for those who rarely push their audio systems to high volumes.
Build Quality
82%
18%
The build quality is generally solid, with polypropylene cones and durable rubber surrounds that enhance the longevity and performance of these speakers. Users report that the materials contribute to better sound clarity and durability over time, even under extended use.
However, a few users feel that the overall build could be sturdier, especially in terms of the housing. While the speakers perform well, they might not feel as premium as some other high-end audio systems in terms of their physical feel and finish.
Volume Handling
80%
20%
The speakers handle moderate to high volumes without significant distortion, making them a good fit for casual to moderate music enthusiasts. Many users find that they can enjoy clear audio at higher levels without the sound breaking up or losing clarity.
However, a segment of users note that at maximum volume, the speakers can start to show signs of strain. For those who frequently listen to audio at maximum levels, the performance might not be as robust as more expensive, higher-end alternatives.
Fit and Compatibility
93%
A standout feature is the versatility of these speakers. The minimal tweeter protrusion and standard size make them compatible with a wide range of vehicles, even for users with less common car models. Most find installation straightforward with no need for additional modifications.
A few users do report that while the fit is generally good, some vehicles may require small adjustments or additional tools to get the perfect installation. However, these issues are usually minor and not widespread.
Value for Money
92%
These speakers offer excellent value for money, providing solid performance at a price point that many find affordable. Reviewers often mention that the overall sound quality, ease of installation, and durability make them a great investment for upgrading factory-installed audio systems.
On the downside, some buyers feel that while the price is reasonable, the speakers don’t offer the same premium sound as higher-end models. Those looking for audiophile-grade quality may find the price-to-performance ratio not as favorable for more discerning tastes.
Durability
78%
22%
The durability of these speakers is generally regarded as good for their price range. The materials used in the construction, such as the polypropylene cones and rubber surrounds, are designed to withstand long-term use, even with regular vibrations and exposure to the elements.
However, some users report that the speakers could be more robust, especially in extreme conditions like very high temperatures or heavy exposure to moisture. While durable for most, users who need speakers for harsh environments may not find them as reliable as more rugged alternatives.
Customer Support
75%
25%
While the product is generally well-received, some users who have had issues with the speakers have reported decent customer support experiences. The support team is responsive to inquiries and issues, offering solutions for common problems such as installation guidance and product returns.
Some customers have reported delays in receiving responses or resolving more complex issues. A few users also feel that the support process could be smoother, especially when dealing with warranty claims or product malfunctions.
Overall Satisfaction
84%
Overall, users are satisfied with the performance and value offered by these speakers. The ease of installation, clear sound, and affordable price point make them a popular choice for those looking to upgrade their car audio system without breaking the bank.
However, some users feel that the speakers lack certain advanced features or top-tier sound quality. While generally positive, some find the speakers fall short for those who demand the absolute best performance in every aspect of their car audio setup.

Suitable for:

The KICKER 51KSC6904 KS-Series 6x9 Coaxial Speakers are a solid choice for car audio enthusiasts looking to upgrade their factory-installed speakers without the need for complicated modifications. They are ideal for users who appreciate clear, balanced sound, particularly in the midrange and bass frequencies. The speakers are especially well-suited for those who want an easy installation process, as they require no modifications and fit most vehicle models with minimal hassle. This makes them a great option for first-time DIYers or those who need a straightforward upgrade to their audio system. Additionally, music lovers who enjoy a full-range sound with deep bass will find these speakers to be a worthwhile investment.

Not suitable for:

While the KICKER 51KSC6904 KS-Series speakers offer great performance for the price, they may not be ideal for audiophiles or users who demand the highest sound quality. Some buyers feel that the bass could be more pronounced, and others find the midrange clarity lacking at higher volumes. Additionally, those who frequently listen to music at maximum volume may experience distortion or a lack of punch. If you're seeking ultra-sharp treble or extremely high-fidelity sound, these speakers might not meet your expectations. Finally, users with very specific or high-end audio setups might want to explore premium options that offer even better overall sound quality.

Specifications

  • Speaker Type: Coaxial speaker design provides a full-range sound in one compact unit.
  • Impedance: Rated at 4 Ohms, ensuring compatibility with most car audio systems.
  • Maximum Output Power: Supports up to 300 Watts maximum power for high output and performance.
  • Frequency Response: Offers a broad frequency range of 300Hz to 20kHz for clear highs and deep bass.
  • Sensitivity: 85 dB sensitivity allows for efficient sound production with minimal distortion.
  • Tweeter Size: Equipped with a 1-inch tweeter for clear, crisp high frequencies.
  • Woofer Size: 6-inch woofer provides deep, rich bass response and balanced sound.
  • Mounting Depth: Top mount depth of 1-5/8″ and bottom mount depth of 1-7/8″ for easy fitment.
  • Mounting Hole Diameter: Requires a 3-1/16″ hole diameter for proper installation in most vehicles.
  • Recommended Amplifier Power: Works best with amplifiers providing 15-50 Watts per channel for optimal performance.
  • Driver Type: Dynamic driver type for efficient sound reproduction and durability.
  • Installation: Designed for no-modification installation, making it easy to upgrade factory speakers.
  • Shape: Rectangular shape for standard 6x9-inch speaker mounting locations.
  • Cone Material: Polypropylene cone ensures durability and sound clarity even under high output.
  • Surround Material: Tough rubber surrounds improve durability and maintain sound clarity over time.
  • Vehicle Compatibility: Fits in a wide range of vehicles with no need for modifications.
  • Durability: Built with durable materials to withstand regular usage and provide long-lasting performance.
  • Sound Quality: Engineered to deliver a balanced sound profile with strong midrange and bass frequencies.

FAQ

The KICKER 51KSC6904 KS-Series 6x9 Coaxial Speakers offer high-performance sound with a strong emphasis on clear midrange and deep bass. The compact design ensures easy installation without requiring modifications, making it a great choice for users looking for a hassle-free upgrade.

These 6x9 coaxial speakers are designed for easy, no-modification installation. Simply check that your vehicle has the appropriate mounting space (3-1/16” hole diameter and a mounting depth of about 1-5/8”). Then, connect the wiring, and they should fit without any cutting or alterations required.

The KICKER 51KSC6904 speakers have a maximum output power of 300 watts, allowing for strong audio performance even at higher volumes. This power capability ensures that you can enjoy clear, loud sound with minimal distortion.

Yes, many users report that these speakers deliver a solid bass response, particularly for their size. The combination of polypropylene cones and rubber surrounds ensures durability while providing clear and deep bass, making them suitable for most listening preferences.

The KICKER 51KSC6904 speakers are designed with a minimal tweeter protrusion, making them compatible with most vehicles. However, it's always a good idea to double-check your vehicle's speaker space and mounting requirements before purchasing to ensure a proper fit.

These speakers are highly rated for delivering a well-balanced sound with clear midrange and punchy bass. The frequency response range of 300Hz to 20kHz ensures that you experience full-range sound suitable for most musical genres.

Yes, these speakers can be used without an amplifier, as they are rated for use with amplifiers between 15 and 50 watts. However, using a dedicated amplifier can provide even better sound quality and performance, especially for users who prefer louder volumes.

No, these speakers are designed for no-modification installation. Their compact design with minimal tweeter protrusion makes them ideal for easy upgrades without the need to modify your vehicle's interior or wiring.

Yes, the KICKER 51KSC6904 speakers are built with polypropylene cones and tough rubber surrounds, which provide both durability and sound clarity. Users have reported that they perform well over time without significant wear.

If you experience distortion at higher volumes, it may be due to overdriving the speakers or using an amplifier with too much power. Ensure that the amplifier's output is within the recommended range (15-50 watts) and consider adjusting the volume to avoid damage.