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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JVC 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

Product ID: 20594483

Details

Audio Output Mode
Stereo
Brand
JVC
Connectivity Technology
Coaxial
Frequency Response
22 KHz
Speaker Maximum Output Power
300 watts

⚡92dB Sensitivity

🎵35Hz-22kHz Frequency Range

🔊300W Peak Power

10029 kr

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Description

🎶 Upgrade your ride’s soundtrack—because your car deserves to sound as sharp as you do!

SLEEK DURABLE DESIGN - Black ABS grills and hybrid surrounds built to endure daily drives in style.
EFFORTLESS INSTALLATION - Shallow mount depth and included accessories get you rocking in no time.
HIGH SENSITIVITY AT 92 D B - Maximize volume with minimal power—perfect for OEM or midrange systems.
POWERFUL 300 W PEAK OUTPUT - Feel every beat with robust sound that transforms your drive.
WIDE FREQUENCY RANGE 35 HZ 22 K HZ - Experience crisp highs and deep mids for a full-spectrum audio journey.

The JVC CS-J620 6.5" 2-way coaxial car speakers deliver a powerful 300W peak output with a broad 35Hz to 22kHz frequency response and high 92dB sensitivity. Featuring mica cone woofers and PEI tweeters with hybrid surrounds, these speakers offer clear, dynamic sound and durable construction. Designed for easy installation with shallow mounting depth and included hardware, they’re the perfect OEM upgrade for drivers seeking crisp, balanced audio without breaking the bank.

Specifications

ASIN	B00OO1ENP4
Additional Features	Mica Cone, Poly-Ether Imide Tweeter, Rubber Surround
Antenna Location	For Music Players
Audio Driver Size	6.5 inches
Audio Driver Type	Dynamic Driver
Audio Output Mode	Stereo
Best Sellers Rank	#3,133 in Electronics ( See Top 100 in Electronics ) #12 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 4.4 out of 5 stars (10,195)
Enclosure Material	Mica Injected Polypropylene, Poly-Ether Imide
Frequency Response	22 KHz
Global Trade Identification Number	00809198920240, 04975769413810
Impedance	4 ohm
Input Voltage	12 volts_of_direct_current
Is Waterproof	FALSE
Item Dimensions D x W x H	13"D x 8"W x 4"H
Item Weight	2.2 pounds
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
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 Count
Warranty Description	30 Days
Warranty Type	Limited
Water Resistance Level	Not Water Resistant
Wireless Technology	Coaxial
Woofer Diameter	6.5 inches

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10029 kr

Duties & taxes included

In stock

Sold byAmazon IcelandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Iceland.

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TrustScore 4.5 | 7,300+ reviews

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