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

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

4.4/5

Product ID: 281554236

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Details

Brand
Gikfun
Speaker maximum output power
3 Watts
Connectivity technology
Coaxial
Audio output mode
Stereo
Mounting type
Tabletop
Model name
EK1725

💧Waterproof durability

📏2-inch precision driver

🔊3W power punch

Description

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

BUILT TO LAST - Waterproof design ensures reliability in diverse environments
COMPACT POWERHOUSE - 3W output delivers crisp, clear sound without bulk
PERFECT FIT FOR DIY - 2-inch diameter ideal for Arduino and custom audio projects
LIGHTWEIGHT VERSATILE - Only 100g per speaker, easy to integrate anywhere
SEAMLESS STEREO EXPERIENCE - 2.0 surround-sound channel configuration for immersive audio

The Gikfun 2" 4Ohm 3W Full Range Audio Speaker (Pack of 2) offers a compact, waterproof design with 3 watts of power and 4-ohm impedance, perfectly engineered for Arduino projects and home audio setups seeking crisp, immersive stereo sound.

Specifications

Subwoofer diameter	2 Inches
Controller type	Volume control
Surround-sound channel configuration	2.0
Colour	Silver
Item weight	0.1 Kilograms
Impedance	4 Ohm
Is waterproof	True
Maximum range	20 Metres
Manufacturer	Esooho
Item model number	LYSB01CHYIU26-ELECTRNCS
Product Dimensions	2.79 x 11.43 x 6.35 cm; 100 g
ASIN	B01CHYIU26

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

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