how many volts do i have to put in it?

Well, the rating of the speaker is 4 ohms and 3 watts. You are limited by the power spec of 3 Watts. To calculate the max voltage use this equation: P = V x V/R. Solving for V, one gets V = sqrt(P * R). So, for these speakers you get V = sqrt(3 watts * 4 ohms) = sqrt(12) = 3.46 volts. The thing to remember is that the 4 ohm "resistance" should be considered as an impedance value. That is it will most likely be a some combination of the DC resistance of the voice coil and the AC reactance of the voice coil measured at 1000 Hz, which is sort of a standard. The thing you want to consider is that at lower frequencies, the AC reactance will decrease and for a given voltage, the current will increase and thus the power rating can end up being exceeded. At higher frequencies the AC reactance will increase and for a given voltage, current will decrease and power will go down. Generally, the power rating for a speaker is determined by how hot the voice coil can be allowed to get before it fails. I have used these with a small 5 volt stereo Class D amplifier rated at 3 watts per channel. With a reasonable enclosure they sound pretty good and can provide plenty of volume considering their size. I hope this helps.

Is one of the dimension really 4.5 inches

No, the speakers are 2" x 2". The "4.5 x 1.1 x 2.5 inches" in the product description is for the package containing two speakers.

If I use this to replace 4 ohm computer speakers driven by 8w amp and keep volume well below max will I do damage?

Probably no damage unless you hit them with more than 4 watts of power.

Are these speakers waterproof

No. I never tested them, but they don't look like other waterproof speakers I have seen.

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Gikfun 2" 4Ohm 3W Full Range Audio Speaker Stereo Woofer Loudspeaker for Arduino (Pack of 2pcs) EK1725

Product ID: 32098629

Details

Audio Output Mode
Stereo
Brand
Gikfun
Connectivity Technology
wired
Mounting Type
Flush Mount
Speaker Maximum Output Power
3 Watts

📏2-inch driver size

🔊3W power output

🎛️4 Ohm impedance

Rp504668

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Description

🎧 Elevate your DIY audio game with pro-grade sound in a compact package!

DIY READY DESIGN - Ideal for soldering and custom builds—upgrade your home audio or educational kits effortlessly.
COMPACT POWERHOUSE - Small 2" drivers deliver crisp, full-range sound perfect for DIY audio projects.
STEREO SOUND IN A PACK - Includes 2 speakers for immersive stereo setups—don’t settle for mono, elevate your sound.
BALANCED AUDIO PERFORMANCE - 4 Ohm impedance and 3W power ensure clear stereo output without distortion.
SEAMLESS ARDUINO INTEGRATION - Optimized for Arduino and hobbyist prototyping—bring your creative sound ideas to life.

The Gikfun 2" 4Ohm 3W Full Range Audio Speaker (Pack of 2) is a compact, wired woofer designed for Arduino and DIY electronics projects. Featuring a 2-inch dynamic driver, 4 Ohm impedance, and 3W rated power, it delivers clear stereo sound with a resonance frequency around 190Hz. Perfect for hobbyists and professionals building custom audio systems, these speakers offer reliable performance and easy integration for creative sound solutions.

Specifications

ASIN	B01CHYIU26
Additional Features	Bass Boost
Antenna Location	Volume
Audio Driver Size	40 Millimeters
Audio Driver Type	Dynamic Driver
Audio Output Mode	Stereo
Best Sellers Rank	#13,641 in Electronics ( See Top 100 in Electronics ) #10 in Surround Sound Systems
Brand	Gikfun
Built-In Media	2 x Speaker
Color	Silver
Compatible Devices	Desktop, MP3 Player, Smartphone
Connectivity Protocol	Bluetooth
Connectivity Technology	wired
Control Method	Voice
Controller Type	Volume control
Customer Package Type	Flat Free Package (FFP)
Customer Reviews	4.3 out of 5 stars 769 Reviews
Enclosure Material	Plastic
Impedance	4 Ohms
Is Waterproof	FALSE
Item Dimensions D x W x H	1.1"D x 4.5"W x 2.5"H
Item Weight	0.1 Kilograms
MP3 player	No
Manufacturer	Esooho
Material	Plastic
Maximum Range	20 Meters
Model Name	EK1725
Model Number	LYSB01CHYIU26-ELECTRNCS
Mounting Type	Flush Mount
Number of Audio Channels	2.0
Number of Items	2
Number of Power Levels	1
Power Source	Corded Electric
Speaker Maximum Output Power	3 Watts
Speaker Size	2 Inches
Speaker Type	Woofer
Specific Uses For Product	DIY electronics projects, Arduino-based prototyping, small-scale audio systems, educational projects for learning about audio technology
Subwoofer Connectivity Technology	Wired
Subwoofer Diameter	2 Inches
Tweeter Diameter	2 Inches
UPC	728821643915 634894434896
Unit Count	1 Count
Warranty Type	Limited
Water Resistance Level	Not Water Resistant
Wireless Technology	Bluetooth
Woofer Diameter	5.08 Centimeters

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Rp504668

Duties & taxes included

In stock

Sold byAmazon IndonesiaDelivered 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 Indonesia.

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TrustScore 4.5 | 7,300+ reviews

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