Upgrading your car’s rear speakers can dramatically improve soundstage and fill, especially for passengers. We researched and compared specifications, owner feedback, and industry standards to bring you seven of the best options. Our evaluation focuses on sound clarity, power handling, build quality, and ease of installation. Whether you want coaxial or component, budget-friendly or premium, this guide will help you choose.
| Photo | Product | Score | Buy |
|---|---|---|---|
 |
JBL GTO939 Best Overall Coaxial 6×9 inch coaxial, 300W peak, 2-ohm impedance |
9.0 | 🛒 Check Price |
 |
Rockford Fosgate R165X3 Best Value Coaxial 6.5 inch coaxial, 60W RMS, 4-ohm impedance |
8.7 | 🛒 Check Price |
 |
Kicker 46CSC654 Best Component Set 6.5 inch component system, 100W RMS, 4-ohm impedance |
8.4 | 🛒 Check Price |
 |
Pioneer TS-A1670F Best for Bass 6.5 inch coaxial, 80W RMS, 4-ohm impedance |
8.1 | 🛒 Check Price |
|
🚗
|
Alpine S-S65 Best for Sound Quality 6.5 inch component system, 80W RMS, 4-ohm impedance |
8.8 | 🛒 Check Price |
 |
JL Audio C2-650 Best Premium Coaxial 6.5 inch coaxial, 75W RMS, 4-ohm impedance |
9.2 | 🛒 Check Price |
 |
Infinity Reference REF-6532IX Best Budget Coaxial 6.5 inch coaxial, 60W RMS, 3-ohm impedance |
7.8 | 🛒 Check Price |
1. JBL GTO939: Best Overall Coaxial
The JBL GTO939 delivers a balanced and detailed sound that impressed us in our research. Its edge-driven tweeter produces crisp highs without harshness, while the Plus One cone design moves more air for solid midbass. Owner feedback consistently praises its clarity and ability to handle high volumes with low distortion. The 2-ohm impedance allows it to draw more power from typical amplifiers, making it a strong performer in matched systems.
However, these speakers are not ideal for underpowered setups. If you plan to run them off a stock stereo, they may sound thin and lack impact. They also require a deeper mounting depth than some vehicles allow. Skip this if you have a shallow rear deck or are not adding an external amplifier. For those building a quality amplified system, the GTO939 is a top contender.
- Edge-driven tetoron tweeter for smooth highs
- Plus One polypropylene cone for increased surface area
- High temperature voice coil for reliability
Pros: Excellent clarity and detail across frequencies; Strong build quality with rubber surround
Cons: Requires moderate power to shine; may underwhelm with factory head units
2. Rockford Fosgate R165X3: Best Value Coaxial
The Rockford Fosgate R165X3 offers a well-rounded performance at a very accessible price point. In our comparison, these speakers stand out for their smooth silk dome tweeter and balanced midrange. Owner reviews note they are easy to install and work well with both factory and aftermarket head units. The integrated crossover helps keep frequencies clean, reducing distortion at higher volumes.
That said, the bass output is modest, and those seeking rear fill with thump may be disappointed. They are not designed to handle heavy low-end without a subwoofer. If your goal is to replace rear speakers on a tight budget and you already have a sub, these are an excellent choice. But if you want full-range rear speakers without a sub, consider a larger size or a model with better low-end extension.
- Injection molded mineral filled polypropylene cone
- Silk dome tweeter with neodymium magnet
- Integrated high-pass crossover
Pros: Great price-to-performance ratio; Clear and natural sound signature
Cons: Limited bass response; best paired with a subwoofer
3. Kicker 46CSC654: Best Component Set
The Kicker 46CSC654 component set delivers a level of detail and separation that coaxial speakers cannot match. Our research shows that the separate tweeter and woofer allow for better placement, creating a more immersive soundstage. The polypropylene cone and rubber surround offer good durability, and the tweeter can be surface or flush mounted. Owner feedback highlights its ability to handle high power without distortion, making it a favorite among enthusiasts.
However, the installation requires cutting holes for the tweeter and mounting the crossover, which may be daunting for DIY beginners. If you are not comfortable with custom mounting or do not have the necessary tools, these may not be for you. They also cost more than comparable coaxials. Skip this if you want a straightforward drop-in replacement.
- Polypropylene cone with ribbed surround
- 1-inch silk dome tweeter with flush and surface mount options
- External crossover network with adjustable tweeter level
Pros: Superb imaging and soundstage with separate tweeter; High power handling for loud, clean playback
Cons: Installation is more complex than coaxial speakers
4. Pioneer TS-A1670F: Best for Bass
The Pioneer TS-A1670F is known for its sturdy low-end performance, a standout feature in our evaluation. Its mica matrix cone provides stiffness without adding weight, allowing it to produce punchy bass that fills the rear. Owner reviews often mention the improved low-frequency response compared to stock speakers. The open-mount tweeter design helps spread highs across the cabin, but some listeners find it a bit bright.
On the downside, the treble can become fatiguing at high volumes, especially with music that already has strong high frequencies. If you are sensitive to sibilance, you may want to use an equalizer to tame the top end. These speakers are a solid choice for those who want more rear bass without a subwoofer, but if you prioritize smooth highs, look elsewhere.
- Mica matrix reinforced polypropylene cone
- Multi-layer mica matrix woofer for rigidity
- Open-mount tweeter for wide dispersion
Pros: Strong bass output for a coaxial speaker; Good efficiency works well with factory power
Cons: Highs can be slightly harsh at high volume
5. Alpine S-S65: Best for Sound Quality
The Alpine S-S65 component set is a favorite among audiophiles for its natural and detailed sound reproduction. Our research shows that the hybrid fiber cone and ring radiator tweeter work together to produce a wide frequency response with minimal distortion. Owner feedback consistently praises the imaging and separation, making it a top choice for critical listening. The included crossover allows fine-tuning of the tweeter output to match the vehicle acoustics.
However, this level of performance comes at a higher cost. If you are on a strict budget, these may be out of reach. Additionally, component installation requires more effort. If you are not willing to invest in a proper amplifier and sound deadening, you may not realize their full potential. Skip these if you prefer a simple upgrade or have a limited budget.
- Hybrid fiber cone for natural midrange
- Ring radiator tweeter for extended high frequencies
- High-grade crossover with tweeter level adjustment
Pros: Exceptional clarity and soundstage; High-quality components with excellent build
Cons: Premium price compared to similar coaxials
6. JL Audio C2-650: Best Premium Coaxial
The JL Audio C2-650 coaxial speakers are a benchmark in the premium segment. In our evaluation, they impressed us with their balanced frequency response and remarkable clarity. The silk dome tweeter delivers sweet highs without harshness, and the mica-filled cone provides solid midbass. Owner feedback highlights their ability to play at high volumes with minimal distortion, making them suitable for both casual listening and serious audio systems.
That said, they are among the more expensive coaxial options. If you are looking for a budget-friendly upgrade, these may not be the best fit. They also require a decent amplifier to perform optimally; on factory power, they sound good but not exceptional. Skip these if you are not willing to invest in supporting equipment. For those who want a premium drop-in solution, the C2-650 is a top pick.
- Silk dome tweeter with ferrofluid cooling
- Mica-filled polypropylene cone with rubber surround
- Neodymium magnet for compact design
Pros: Smooth, detailed sound with excellent accuracy; Durable build quality and long-term reliability
Cons: Higher price point than many competitors
7. Infinity Reference REF-6532IX: Best Budget Coaxial
The Infinity Reference REF-6532IX offers an entry-level upgrade that provides noticeable improvement over stock speakers. Our research indicates that its high sensitivity makes it a good match for factory head units, producing louder sound without an amplifier. The polypropylene cone and textile tweeter deliver a decent sound signature for the price. Owner feedback often notes a significant upgrade in clarity and volume compared to factory speakers.
However, the plastic basket and lighter construction raise concerns about long-term durability, especially in harsh environments. The sound can become harsh at high volumes, and bass response is limited. If you are looking for a cheap way to refresh your rear audio and are not demanding, these will serve you well. But if you want lasting quality or plan to add an amplifier, consider spending more for a sturdier option.
- Polypropylene cone with rubber surround
- Edge-driven textile tweeter
- High sensitivity (92 dB) for use with low power
Pros: Very affordable price point; High efficiency works well with factory stereos
Cons: Build quality feels less premium than competitors
Frequently Asked Questions
What size rear speakers should I buy for my car?
Check your vehicle’s owner manual or remove the existing speaker to measure its diameter and depth. Common sizes include 6.5 inches, 6×9 inches, and 5.25 inches. Our guide includes speakers in popular sizes, but always confirm fitment before purchasing.
Should I choose coaxial or component speakers for the rear?
Coaxial speakers are easier to install and provide good sound for rear fill. Component speakers offer better soundstage and clarity but require more complex installation. For most rear applications, coaxial speakers are sufficient and recommended.
Do I need an amplifier for new rear speakers?
While many aftermarket speakers work with factory stereos, an amplifier will unlock their full potential, especially for models with higher power handling. If you want louder, clearer sound without distortion, consider adding an amplifier.
Can I install rear speakers myself?
Yes, if you have basic tools and follow instructions. Most coaxial speakers are direct replacements. Component systems may require drilling and wiring expertise. If you are not comfortable, professional installation is recommended.
How do I match rear speakers with my front speakers?
Ideally, choose rear speakers with similar sensitivity and impedance to your front speakers for balanced sound. Matching brands can also help with tonal consistency. Our picks vary, so consider your front setup when picking rears.
Our Verdict
Our top pick is the JBL GTO939 for its outstanding overall performance and value. For those seeking premium sound quality, the JL Audio C2-650 is an excellent runner up. Both deliver exceptional clarity and build quality backed by positive owner feedback.
More Car Audio Guides
Video Guide
Video: Related tutorial from YouTube