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

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

🎯4Ω impedance for crisp sound

📏2-inch full-range driver

🔊3W power output

NZ$43

Duties & taxes included

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Description

🎵 Small Speaker, Big Sound — Elevate Your DIY Audio Game!

DIY DREAM TEAM - Perfect for hobbyists and pros building custom audio-visual or HiFi systems.
FULL RANGE SOUND - Dynamic driver delivers balanced bass and treble in a sleek stereo setup.
PLUG PLAY READY - Wired connectivity with voice control compatibility for effortless setup.
COMPACT POWERHOUSE - 2" size packs a punch with 3W output for clear, immersive audio.
PRECISION AUDIO MATCH - 4Ω impedance ensures seamless integration with Arduino and DIY projects.

This pack of two 2-inch, 4-ohm, 3-watt full-range stereo woofers is designed for Arduino and DIY audio projects, delivering clear, balanced sound with a resonance frequency around 190Hz and 77dB output. Ideal for hobbyists seeking compact, high-quality speakers to enhance home audio or custom electronics setups.

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	#11,878 in Electronics ( See Top 100 in Electronics ) #11 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 4.3 out of 5 stars (770)
Enclosure Material	Plastic
Impedance	4 ohm
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 kg
Manufacturer	Esooho
Maximum Range	20 meters
Model Name	EK1725
Model Number	LYSB01CHYIU26-ELECTRNCS
Mounting Type	Flush Mount
Number of Audio Channels	2
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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