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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Description

🎶 Elevate your sound game with compact, powerful stereo woofers!

PRECISION AUDIO - 4 Ohm impedance ensures balanced, distortion-free playback
COMPACT POWERHOUSE - 3W output delivers clear, room-filling sound without bulk
DUAL PACK ADVANTAGE - Two speakers included for immersive stereo experience
PLUG PLAY CONVENIENCE - Auxiliary input and wireless Bluetooth connectivity for effortless setup
VERSATILE COMPATIBILITY - Seamlessly pairs with smartphones, tablets, laptops, and TVs

The Gikfun EK1725 is a pair of 3W full-range stereo woofers with 4 Ohm impedance, designed for crisp, balanced audio. Compact and lightweight, these speakers support Bluetooth and auxiliary input, making them ideal for enhancing sound on smartphones, tablets, laptops, and TVs. Perfect for professionals seeking quality audio in a sleek, easy-to-integrate package.

Specifications

Model Name	EK1725
Speaker Type	Woofer
Special Feature	Subwoofer
Recommended Uses For Product	For Smartphones or Tablets
Compatible Devices	Smartphone, Tablet, Laptop, Television
Net Quantity	2 Count
Item Weight	0.1 Kilograms
Impedance	4 Ohm
Is Waterproof	false
Maximum Range	20 metres
Number of Items	2
Control Method	Voice
Wireless Communication Technology	Bluetooth
Speaker Size	2 Inches
Power Source	Battery Powered
Tweeter Diameter	2 Inches
Water Resistance Level	Not Water Resistant
Audio Driver Type	Dynamic Driver
Subwoofer Connectivity Technology	Wireless
Includes MP3 player?	No
UPC	728821643915 634894434896
Model	LYSB01CHYIU26-ELECTRNCS
Product Dimensions	2.79 x 11.43 x 6.35 cm; 100 g
Item model number	LYSB01CHYIU26-ELECTRNCS
Special Features	Subwoofer
Audio input compatible with the item	Auxiliary
Wattage	3 Watts
Batteries Included	No
Batteries Required	No
Has Auto Focus	No
Programmable Buttons	No
Country of Origin	USA
Item Weight	100 g

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