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.

Jvc Cs J620 Koaxial Lautsprecher 16 Cm 2 Wege Schwarz

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Description

🎶 Upgrade your drive with sound that commands attention!

HIGH SENSITIVITY AT 92 D B - Maximize volume with minimal power—perfect for long drives.
POWERFUL 300 W PEAK OUTPUT - Feel every beat with dynamic sound that fills your ride.
SLEEK BLACK ABS COMPOSITE GRILLS - Modern design that seamlessly upgrades your car’s interior vibe.
DURABLE MICA CONE HYBRID SURROUND - Engineered for lasting performance and rich, distortion-free sound.
WIDE FREQUENCY RANGE 35 22 000 HZ - Experience crisp highs and deep lows for a full audio spectrum.

The JVC CS-J620 is a 6.5-inch 2-way coaxial car speaker delivering up to 300 watts peak power and a wide frequency response from 35 to 22,000 Hz. Featuring a mica cone woofer, poly-ether imide tweeter, and hybrid rubber/cloth surround, it offers clear, balanced sound with 92dB sensitivity and 4-ohm impedance. Designed for easy surface or flush mounting, its sleek black ABS grills add a stylish touch to any vehicle audio setup.

Specifications

ASIN	B00OO1ENP4
Additional Features	Mica Cone, Poly-Ether Imide Tweeter, Rubber Surround
Age Range Description	Adult
Antenna Location	For Music Players, For Surround Sound Systems
Audio Driver Size	6.5 Inches
Audio Driver Type	Dynamic Driver
Audio Output Mode	Stereo
Best Sellers Rank	#85,355 in Electronics ( See Top 100 in Electronics ) #290 in Coaxial Car Speakers
Brand	JVC
Built-In Media	Speakers
Color	black
Compatible Devices	Car
Compatible with Vehicle Type	Car, Truck
Connectivity Protocol	Coaxial
Connectivity Technology	Coaxial
Control Method	Touch
Controller Type	Remote Control
Country of Origin	China
Customer Package Type	standard packaging
Customer Reviews	4.4 4.4 out of 5 stars (9,493)
EU Spare Part Availability Duration	7 Years
Enclosure Material	Acrylonitrile Butadiene Styrene
Frequency Response	22000 Hz
Global Trade Identification Number	00809198920240, 04975769413810
Impedance	4 Ohms
Input Voltage	12 Volts (DC)
Is Waterproof	TRUE
Item Dimensions D x W x H	19.3D x 34W x 9.1H centimeters
Item Weight	2.2 Pounds
MP3 player	No
Manufacturer	JVC
Maximum Range	30 Meters
Model Name	CS-J620
Model Number	CS-J620
Mounting Type	surface mount or flush mount
Number of Audio Channels	2.0
Number of Items	2
Power Source	Corded Electric
Speaker Maximum Output Power	300 Watts
Speaker Size	6.5 Inches
Speaker Type	Coaxial
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	Waterproof
Wireless Technology	Coaxial
Woofer Diameter	16.51 Centimeters

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$57.51

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JVC CS-J620 Koaxial Lautsprecher (16 cm, 2-Wege) schwarz

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