Will these work for 6.75”?

Not sure but most of the time the speaker basket remains the same from a 6.5 to a 6.75

Will this work in 2012 Kia Optima?

They make them for many different size speakers. Find out what speaker size you have, and buy accordingly. They are very customizable.... Yes

Will this benefit component speakers?

They keep water off of the speaker in the event of rain or a car wash. If you’re sure that no water will ever get on them, then don’t bother. Otherwise, they’re cheap insurance.

Will this help with harshness and shrill treble ?

It will help give resonance to your speakers. Maybe look at adjusting your equalizer and cutting some highs out. I have these on all four of my 6.5” mid components and they’re fantastic..

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RECOIL SPB65 Foldable Silicone 6.5” Car Speaker Baffle Kits with Egg Crate Foam for Sound Quality Improvement and Speaker Protection One Pair

RECOIL SPB65 Foldable Silicone 6.5” Car Speaker Baffle Kits with Egg Crate Foam for Sound Quality Improvement and Speaker Protection One Pair

Product ID: 735752320

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Details

Brand
RECOIL
Mounting type
Flush Mount
Model name
SPB65
Speaker type
Coaxial
Included components
with Egg Crate
Product dimensions
6D x 17W x 7H

💧water-resistant fold design

🔊6.5” precision fit

🛡️patented silicone seal

Description

🔊 Elevate your ride’s sound game with the ultimate silicone speaker shield!

CUSTOMIZABLE FIT FOLD - Foldable front ring and trim-to-fit bottom ensure perfect mounting depth without sound loss.
CRYSTAL CLEAR SOUND SEAL - Patented silicone creates a tight, vibration-free speaker fit for pristine audio clarity.
SPEAKER PROTECTION UPGRADE - Water-resistant design shields your speakers from door leaks and moisture damage.
DURABLE ECO FRIENDLY MATERIAL - High-quality silicone outlasts foam/EVA alternatives, combining longevity with sustainability.
NOISE REVERBERATION BLOCKER - Soft silicone and egg crate foam combo drastically reduce road noise and panel vibrations.

The RECOIL SPB65 is a patented foldable silicone speaker baffle kit designed to enhance 6.5” car speaker performance by sealing out vibrations, reducing road noise, and protecting speakers from moisture. Featuring a customizable foldable design and durable eco-friendly silicone, it ensures superior sound clarity and long-lasting protection for your vehicle’s audio system.

Specifications

Speaker Size	6.5 Inches
Specific Uses For Product	vehicle sound improvement
Controller Type	ring
Color	grey
Is Waterproof	True
Warranty Type	Extended or Limited
Mounting Type	Car Mount,Foldable
Material Type	silicone
Speaker Type	Woofer
Additional Features	waterproof, Foldable
Recommended Uses For Product	Vehicle,Door,Car
Unit Count	1 Count
Is Electric	No
Power Source	Corded Electric
Number of Audio Channels	1.0
Compatible with Vehicle Type	Car
Compatible Devices	Car
Subwoofer Connectivity Technology	Wired