Infinity KAPPA-86CFX 6×8 Car Speaker Review

Are you looking for new speakers or an upgrade to your old car speakers? If so, you may want to consider the Infinity KAPPA-86CFX 6×8 car speaker. This speaker offers excellent sound quality and a variety of features that can improve your driving experience. 

Plus, it provides great bass and clear sound, making it the perfect addition to any vehicle.

In this review, we’ll take a look at the pros and cons of this speaker to help you decide if it’s the right choice for your needs. We’ll also compare it to some of its competitors to give you a better idea of what’s available on the market. So, keep reading to learn more about the Infinity KAPPA-86CFX!

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Infinity KAPPA-86CFX 6×8 Car Speaker Review

For so many car sound lovers, the name Infinity is synonymous with quality audio. The company has been in business since 1968, and in that time, they have continually pushed the envelope in terms of product design and performance. The Kappa-86CFX is a perfect example of this commitment to excellence.

These 6×8 coaxial speakers offer superb sound quality, thanks to their Patented Plus One woofers and edge-driven textile dome tweeters. Add in the fact that they come with all the necessary installation hardware and you have a winning product that is sure to please even the most discerning listener.

Power Handling

When it comes to power handling the Kappa-86CFX 6×8 speakers are rated at 100 watts RMS and 300 watts peak. This is more than enough power for most car stereos, but if you have an amplifier that can push more power, these speakers can handle it.


The sensitivity rating of these speakers is 94dB (@ 2.83V) which means they are very efficient and will work well with a wide variety of car stereos.

Frequency Response

The frequency response of the 86CFX is 40Hz – 25kHz which covers the entire range of human hearing. This means you will be able to hear all the details in your music, no matter what genre you prefer.

Voice Coil Diameter

The voice coil diameter on these speakers is 1-3/16 inches (30mm) which is a bit larger than average. This means they will be able to handle more power and produce better sound quality.


The impedance of this is 2.5 ohms which is a bit lower than some other coaxial speakers on the market. This is not an issue, however, as most car stereos can handle this load without any problems.


Installing the Kappa-86CFX speakers is a relatively simple process. The included hardware and instructions make it easy to get them installed and ready to go. All you need is a screwdriver and a drill and you should be able to get them installed in no time.


These speakers are built to last. The woofers are made from a tough polymer material that can withstand a lot of abuse. The tweeters are also made from a durable material that can handle high volumes without distortion.

Sound Quality

The sound quality of these speakers is superb. The Patented Plus One woofers give them tight, robust bass that is still detailed and musical. The edge-driven textile dome tweeters produce silky smooth highs that make listening to music a pleasure.

What’s in the Box?

When you purchase a set of Kappa-86CFX speakers, you will get two speakers, two spacers, two foam gaskets, eight screws, eight-speed clips, two Infinity logo badges, and two brand stickers, and an owner’s manual. This means you will have everything you need to install them in your car and get great sound.

  • Best Sound Quality
  • High Power Handling
  • Easy to Install
  • Durable Construction
  • A Bit Pricey

My Recommendation

According to my research, the Kappa-86CFX 6×8 coaxial car speakers are one of the best sounding and most durable options on the market. If you are looking for a quality product that will provide years of listening pleasure, then these are the speakers for you. I highly recommend them.


If you are looking for a quality set of 6×8 coaxial speakers, the Infinity Kappa-86CFX should be at the top of your list. These speakers offer great sound quality, power handling, and sensitivity, all in a package that is easy to install. With all the included hardware, you will be able to enjoy your new speakers in no time.


Did I install them yourself or have someone do it?

I installed them myself. I found the process to be very straightforward and the included instructions were easy to follow.

How long have you had these speakers?

I’ve had them for about two months now and they are still going strong.

What is your opinion of the sound quality?

The sound quality is excellent. The bass is tight and punchy, and the highs are smooth and detailed.

Would you recommend these speakers to a friend?

Yes, I would highly recommend these speakers to a friend (or anyone else for that matter).

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