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.

Gikfun 2 4ohm 3w Full Range Audio Speaker Stereo Woofer

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NZ$61

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Sold byAmazon New ZealandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🎶 Small Speakers, Big Sound — Don’t Miss Out on Next-Level Audio!

COMPACT POWERHOUSE - 3W full-range stereo sound that fits any project or personal setup
DUAL PACK ADVANTAGE - Two speakers included for true stereo experience or flexible multi-use setups
LIGHTWEIGHT PORTABLE - Sleek 2-inch woofer design weighing just 0.1 kg each, perfect for on-the-go audio projects
DYNAMIC AUDIO PRECISION - 40mm dynamic drivers deliver crisp, immersive audio clarity
SEAMLESS WIRELESS FREEDOM - Bluetooth connectivity for effortless pairing with smartphones, tablets, and laptops

The Gikfun EK1725 is a pair of 3W, 4-ohm full-range stereo woofers featuring 40mm dynamic drivers and Bluetooth wireless connectivity. Designed for personal and portable audio projects, these lightweight speakers deliver impressive sound clarity and easy integration with smartphones, tablets, and laptops. Ideal for DIY electronics and compact audio setups, this pack of two offers a seamless stereo experience in a sleek, non-waterproof plastic enclosure.

Specifications

ASIN	B01CHYIU26
Age Range Description	Adult
Antenna Location	For Smartphones or Tablets
Audio Driver Size	40 Millimetres
Audio Driver Type	Dynamic Driver
Audio Output Mode	Stereo
Battery Average Life	5 Hours
Best Sellers Rank	#861,196 in Electronics ( See Top 100 in Electronics ) #363 in Car Component Subwoofers
Box Contents	2 speakers
Brand	Gikfun
Brand Name	Gikfun
Colour	Silver
Compatible Devices	Smartphone, Tablet, Laptop, Television
Connectivity Protocol	Bluetooth
Connectivity Technology	Bluetooth
Control Method	Voice
Controller Type	Voice Control
Customer Package Type	Flat Free Package (FFP)
Customer Reviews	4.3 out of 5 stars 743 Reviews
Enclosure Material	Plastic
Impedance Unit of Measure	4 Ohms
Is Waterproof	false
Item Dimensions D x W x H	2.8D x 11.4W x 6.4H Centimeters
Item Weight Unit of Measure	0.1 Kilograms
MP3 player	No
Manufacturer	Gikfun
Material	Plastic
Maximum Range	20 metres
Model Name	EK1725
Model Number	LYSB01CHYIU26-ELECTRNCS
Mounting Type	Flush Mount
Network Connectivity Technology	Bluetooth
Number of Audio Channels	2.0
Number of Items	2
Number of Power Levels	1
Power Source	Battery Powered
Product Features	Subwoofer
Speaker Maximum Output Power	3 Watts
Speaker Size	2 Inches
Speaker Type	Woofer
Specific Uses For Product	personal or portable audio setups
Subwoofer Connectivity Technology	Wireless
Subwoofer Speaker Diameter Unit of Measure	2 Inches
Tweeter Driver Diameter	2 Inches
UPC	728821643915 634894434896
Unit Count	2 Count
Water Resistance Level	Not Water Resistant
Wireless Technology Type	Bluetooth
Woofer Driver Diameter	2 Inches

Reviews

Z**Y

Great Little Project Speakers

These little project speakers worked great. I built a bluetooth radio for my dad and used them with no issues. The sound is impressive for the size and price point.

31.10.2025

G**T

Great for projects nice set of speakers !

Nice speakers can't complain for the price !

20.11.2025

A**.

Decent

For the price, not bad. I have them enclosed in a speaker box, but even then, they’re not particularly loud. More so, I’ve noticed the last week that the sound quality seems to be fading a bit, getting a bit static-y in its sound at all volumes

10.04.2024

A**N

They work

Sound quality was quite poor but they are cheap and worked / were easy to install.

16.09.2024

C**T

Speakers

Fit perfect and sounds good.

6.01.2026

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