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

🎶 Upgrade your drive with sound that commands attention!

HIGH SENSITIVITY 92 D B - Maximize volume with minimal power for efficient, dynamic sound.
SLEEK DURABLE DESIGN - Black ABS composite grills and hybrid surrounds built to last and impress.
POWERFUL 300 W PEAK OUTPUT - Feel every beat with robust sound that outperforms your OEM speakers.
EASY HASSLE FREE INSTALLATION - Shallow mount depth and included hardware make upgrades quick and seamless.
WIDE FREQUENCY RANGE 35 HZ 22 K HZ - Experience crystal-clear highs and rich mids for immersive audio clarity.

The JVC CS-J620 6.5" 2-way coaxial car speakers deliver 300W peak power with a wide 35Hz-22kHz frequency response and high 92dB sensitivity. Featuring mica cone woofers and PEI tweeters housed in durable ABS grills, these speakers offer clear, dynamic sound and easy installation with shallow mounting depth and included accessories—perfect for upgrading your vehicle’s audio without breaking the bank.

Specifications

ASIN	B00OO1ENP4
Additional Features	Mica Cone, Neodymium Magnet (Tweeter), Stereo pairing
Antenna Location	For Music Players
Audio Driver Size	6.5 Inches
Audio Driver Type	Dynamic Driver
Audio Output Mode	Stereo
Best Sellers Rank	#3,256 in Electronics ( See Top 100 in Electronics ) #17 in Car Coaxial Speakers
Brand	JVC
Built-In Media	Speakers
Color	black
Compatible Devices	Car, Truck
Compatible with Vehicle Type	Car, Truck
Connectivity Protocol	Coaxial
Connectivity Technology	Coaxial
Control Method	Touch
Customer Package Type	Standard Packaging
Customer Reviews	4.4 out of 5 stars 23,395 Reviews
Enclosure Material	Mica Injected Polypropylene, Poly-Ether Imide
Frequency Response	22 KHz
Global Trade Identification Number	00809198920240, 04975769413810
Impedance	4 Ohms
Input Voltage	12 Volts (DC)
Is Waterproof	FALSE
Item Dimensions D x W x H	13"D x 8"W x 4"H
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	1
Power Source	Corded Electric
Speaker Maximum Output Power	300 Watts
Speaker Size	6.5 Inches
Speaker Type	Coaxial
Specific Uses For Product	Music playback in vehicles
Subwoofer Connectivity Technology	Wired
Subwoofer Diameter	6.5 Inches
Total Ethernet Ports	2
Tweeter Diameter	1 Inches
UPC	613815616498 809198920240 796594442363 046838068355 823019870491
Unit Count	1.0 Count
Warranty Description	30 Days
Warranty Type	Limited
Water Resistance Level	Not Water Resistant
Wireless Technology	Coaxial
Woofer Diameter	6.5 Inches

Reviews

A**R

31.03.2026

M**I

25.03.2026

C**R

28.05.2025

M**A

25.12.2025

P**.

17.02.2025

J**I

7.09.2019

N**R

13.03.2026

G**6

30.04.2025

I**P

3.08.2025

H**O

11.06.2022

F**.

16.12.2025

D**M

8.02.2025

M**N

1.11.2024

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CS-J620 300W 6.5" CS Series 2-Way Coaxial Car Speakers, Set of 2, 6.5" Mica Cone Woofer & 1" PEI Tweeter, Hybrid Surround, Easy Installation

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