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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Sold byAmazon KUWAITDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🎶 Upgrade your ride’s soundtrack — because your commute deserves a standing ovation!

POWERFUL 300 W OUTPUT - Feel every beat with crystal-clear volume that commands attention on the road.
PRECISION 92 D B SENSITIVITY - Maximize audio clarity and efficiency for an immersive surround sound experience.
COMPACT 6 5 DYNAMIC DRIVERS - Perfectly sized for seamless integration without sacrificing sound quality.
DURABLE BLACK ABS COMPOSITE GRILLE - Sleek, resilient design that protects your speakers while complementing your car’s interior.
WIDE FREQUENCY RANGE 35 22 000 HZ - Catch every nuance from deep bass to crisp highs, elevating your daily drive.

The JVC CS-J620 is a set of 6.5-inch 2-way coaxial car speakers delivering up to 300W peak power with a sensitivity of 92dB and a broad frequency response from 35Hz to 22kHz. Designed with durable ABS composite grilles and a compact top-mount depth, these speakers offer high-quality surround sound, perfect for enhancing your vehicle’s audio system with reliable performance and stylish integration.

Specifications

ASIN	B00OO1ENP4
Additional Features	Surround Sound
Amazon Bestseller	#596,754 in Automotive ( See Top 100 in Automotive ) #260 in Car Coaxial Speakers
Antenna Location	For Surround Sound Systems
Audio Driver Size	6.5 Inches
Audio Driver Type	Dynamic Driver
Audio Output Mode	Stereo
Brand	JVC
Built-In Media	Speaker
Color	Black
Compatible Devices	car
Compatible with Vehicle Type	Car, Truck
Connectivity Technology	Coaxial
Control Method	Remote
Controller Type	Remote Control
Customer Package Type	Standard Packaging
Customer Reviews	4.4 4.4 out of 5 stars (9,477)
EU Spare Part Availability Duration	7 Years
Enclosure Material	Mica-infused polypropylene, polyether imide
Frequency Response	22000 Hz
Global Trade Identification Number	00809198920240, 04975769413810
Impedance	4 Ohms
Input Voltage	12 Volts (DC)
Is Waterproof	False
Item Dimensions D x W x H	33D x 20.3W x 10.2H cm
Item Weight	2.2 Pounds
MP3 player	No
Manufacturer	JVC
Maximum Range	30 Meters
Model Name	CS-J620
Model Number	CS-J620
Mounting Type	Ceiling Mount
Number of Audio Channels	2.0
Number of Items	1
Number of Power Levels	1
Power Source	Corded Electric
Speaker Maximum Output Power	300 Watts
Speaker Size	6.5 Inches
Speaker Type	Surround Sound
Specific Uses For Product	Music, Car
Subwoofer Connectivity Technology	Wired
Subwoofer Diameter	16 Centimeters
Total Ethernet Ports	2
Tweeter Diameter	1 Inches
UPC	613815616498 809198920240 796594442363 046838068355 823019870491
Water Resistance Level	Not Water Resistant
Wireless Technology	Coaxial
Woofer Diameter	6.5 Inches

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