do I have to match the rms of all 4 speakers or can I have bigger speakers in the rear?

not necessary sir..infact you should have bigger speakers in the rear because of the distance between the driver and the rear speakers, front speakers are relatively closer.

How long is the warranty without the 2 year protection?

It depends who you buy them from. Many Amazon sellers cannot give you a warranty because they are not authorized dealers for Harmon.

When installing these in small, individual boxes (like truck boxes for example) would it be beneficial to add foam speaker baffles?

Just add Hollow fill like the stuff that's in pillows

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Harman Kardon Infinity Reference X REF-9603ix 6"x9" 3-Way car Speakers

Product ID: 208342321

Details

Brand
Harman Kardon
Speaker Maximum Output Power
600 Watts
Connectivity Technology
Coaxial
Audio Output Mode
Stereo
Mounting Type
Car Mount

⚡3 Ohm impedance

🎶46Hz-21kHz range

🔊600W max power

Description

🎉 Elevate Your Drive with Harman Kardon Sound!

HIGH SENSITIVITY - With a sensitivity of 94dB, every note is delivered with stunning clarity.
THREE WAY DESIGN - The 3-way speaker system ensures a rich and immersive listening experience.
UNLEASH THE SOUND - Experience a powerful 600W output that transforms your car into a concert hall.
PRECISION ENGINEERING - Enjoy a wide frequency response from 46Hz to 21kHz for crystal-clear audio.
EFFORTLESS INSTALLATION - Designed for easy car mounting, making upgrades a breeze.

The Harman Kardon Infinity Reference X REF-9603ix is a high-performance 6" x 9" three-way car speaker designed for audiophiles. With a continuous power handling of 100W and a peak of 300W, it delivers exceptional sound quality across a wide frequency range. Its lightweight design and easy car mounting make it a perfect upgrade for any vehicle.

Specifications

ASIN	B00Q1UP0F8
Antenna Location	Car
Audio Driver Size	6 Inches
Audio Driver Type	Dynamic Driver
Audio Output Mode	Stereo
Brand	INFINITY
Compatible Devices	Laptop, Smartphone, Tablet
Compatible with Vehicle Type	Car
Connectivity Technology	Coaxial
Control Method	Touch
Customer Package Type	Standard Packaging
Customer Reviews	4.3 out of 5 stars 40 Reviews
Is Waterproof	FALSE
Item Weight	3 Pounds
Manufacturer	INFINITY
Model Number	LYSB007SNNS4W-ELECTRNCS
Mounting Type	Car Mount
Number of Audio Channels	3.0
Power Source	Corded Electric
Speaker Maximum Output Power	600 Watts
Speaker Size	6 Inches
Speaker Type	Component
Specific Uses For Product	Car Audio
UPC	050667368456
Warranty Type	Limited

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