is it 30 watts rms each ? or 15 rms each to make it 30 rms?

Pretty sure it's 30 each. Still not very high...These would be best suited to to run off a factory unit, or lower powered aftermarket head unit or small amp....It's not as much about the max watts so much as the rms, match that up to your amp whether it's the HU or external amp for best efficiency...

What size amp should i use if i buy 4 of these?

U can use a 400 what's. With low frequency

do you need a wiring harness or any connector?

Mine were direct replacements, the head unit i had bought 3 weeks earlier came with a new conversion harness, I did have to change the connectors on the speaker wires.

do these have to be broken in? My stock speaker is louder than them

I doubt they need much breaking in. I wouldn't play them too hard maybe at first but these are a budget speaker at best, don't think you're going to get real great performance out of them. Your stock speakers probably are louder at the same volume on the radio due to better mid range sensitivity ...most regular oem systems have pretty ho-hum speakers, but do produce decent volume for mid-range sounds.

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Description

🎶 Elevate your drive with sound that speaks louder than words!

POWER YOUR DRIVE - Experience crisp, booming sound with 300 watts of peak power that transforms your car rides into immersive audio journeys.
WIRELESS FREEDOM - Bluetooth connectivity lets you stream your favorite playlists effortlessly, cutting the cord without cutting quality.
BUILT FOR THE ROAD - Lightweight at just under 1kg per speaker, these woofers deliver powerful sound without weighing down your vehicle.
PLUG PLAY CONVENIENCE - Includes screws and warranty card for easy installation and peace of mind—upgrade your car audio hassle-free.
PERFECT FIT PERFECT SOUND - 6.5-inch woofer designed to seamlessly integrate into most car audio systems for rich, balanced sound.

The JVC CSJ620 is a 300-watt, 6.5-inch 2-way coaxial car speaker set featuring Bluetooth wireless technology, designed for superior in-car audio performance. Lightweight and easy to install, it offers a perfect balance of power and clarity, making it an essential upgrade for any car audio enthusiast.

Specifications

Model Name	CSJ620X
Speaker Type	Woofer
Recommended Uses For Product	Car
Subwoofer Diameter	5 Inches
Surround Sound Channel Configuration	5 1
Included Components	2 speakers, Screws and Warranty Card
Item Weight	2.2 Pounds
Impedance	4 Ohm
Is Waterproof	false
Maximum Range	30 metres
Wireless Communication Technology	Bluetooth
Speaker Size	6.5 Inches
Power Source	Battery Powered
Includes MP3 player?	No
UPC	613815616498 809198920240 796594442363 046838068355 823019870491
Global Trade Identification Number	00809198920240, 04975769413810
Product Dimensions	34.04 x 19.3 x 9.14 cm; 997.9 g
Item model number	CS-J620
Display size	1.72 Inches
Other display features	Wireless
Item Weight	998 g

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