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: 412589505

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Details

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

🎵Full Range Stereo Sound

📶4 Ohm Impedance Precision

🔊3W Power Punch

Description

🎧 Elevate your sound game with compact power that fits anywhere!

COMPACT POWER DUO - Two 3W full-range woofers for immersive stereo sound.
DYNAMIC AUDIO DRIVERS - High-quality dynamic drivers deliver crisp, balanced sound.
LIGHTWEIGHT PORTABLE - Just 100g each, perfect for on-the-go audio upgrades.
SEAMLESS COMPATIBILITY - Works effortlessly with smartphones, tablets, laptops, and TVs.
PLUG PLAY VERSATILITY - Auxiliary input and Bluetooth-ready for flexible connectivity.

The Gikfun EK1725 pack includes two 3W, 4 Ohm full-range stereo woofers designed for seamless integration with smartphones, tablets, laptops, and TVs. Lightweight and portable at 100g each, these dynamic driver speakers deliver crisp, balanced audio with versatile auxiliary and Bluetooth connectivity options, perfect for professionals seeking a sleek, powerful sound upgrade.

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
Age Range (Description)	Adult
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
Connectivity Protocol	Bluetooth
Includes MP3 player?	No
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
Item Weight	100 g

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