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 Ek1725 3w 4ohm 2 Full Range Audio Speaker Woofer

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Sold byAmazon CyprusDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🎧 Small Speaker, Big Impact: Power Your DIY Audio Revolution!

DIY DREAM KIT - Ideal for hobbyists and pros alike—build, learn, and impress with a sleek silver finish and easy integration.
STEREO SOUND DUO - Comes as a 2-pack for true stereo experience, elevating your custom audio creations to pro-level.
COMPACT PRECISION - 2-inch diameter fits seamlessly into any Arduino or Raspberry Pi setup without bulk.
OPTIMIZED IMPEDANCE - 4 ohm rating ensures efficient power use and clear stereo sound reproduction.
POWER PACKED MINIATURE - 3W output delivers surprisingly rich audio for its size, perfect for crisp DIY sound projects.

The Gikfun EK1725 is a pair of 2-inch, 3W, 4-ohm full-range stereo woofers designed for Arduino and DIY electronics projects. Compact and efficient, these speakers deliver clear, crisp sound ideal for home audio-visual setups and educational prototyping. Their sleek silver design and stereo pairing make them a must-have for millennial makers seeking to blend tech savvy with stylish sound.

Specifications

ASIN	B01CHYIU26
Additional Features	Compatible with Arduino
Age Range Description	Adult
Antenna Location	For DIY electronics projects, Arduino-based prototyping, and small-scale audio systems
Audio Driver Size	40 Millimeters
Audio Driver Type	Dynamic Driver
Audio Output Mode	Stereo
Audio output mode	Stereo
Best Sellers Rank	#79,571 in Electronics ( See Top 100 in Electronics ) #72 in Home Theater Speaker Systems
Brand	Gikfun
Built-In Media	2 speakers
Color	Silver
Compatible Devices	DIY electronics projects, Arduino, Raspberry Pi
Connectivity Protocol	Coaxial cable
Connectivity Technology	Coaxial
Connectivity technology	Coaxial
Control Method	Voice
Controller Type	Volume control
Customer Package Type	Flat Free Package (FFP)
Customer Reviews	4.3 out of 5 stars 739 Reviews
Enclosure Material	Plastic
Impedance	4 ohm
Is Waterproof	false
Item Dimensions D x W x H	2.8D x 11.4W x 6.4H centimeters
Item Weight	0.1 Kilograms
MP3 player	No
Manufacturer	Gikfun
Material	Plastic
Maximum Range	20 Meters
Model Name	EK1725
Model Number	LYSB01CHYIU26-ELECTRNCS
Mounting Type	Flush Mount
Mounting type	Flush Mount
Number of Audio Channels	2.0
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
Speaker maximum output power	3 Watts
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	2 Count
Warranty Type	Limited
Water Resistance Level	Not Water Resistant
Wireless Technology	Bluetooth
Woofer 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

C**T

Speakers

Fit perfect and sounds good.

6.01.2026

D**R

Good Quality, Good Price. Won’t fit Echo Dot 3.

I originally purchased to replace the speaker in an Echo Dot 3, but they are too large. They are perfect for arduino projects.

11.03.2024

A**N

They work

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

16.09.2024

M**L

Nice little speakers

Nice little speakers. Good sound. Note: You get a total of four speakers.

3.10.2025

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€ 42.31

Duties & taxes included

In stock

Sold byAmazon CyprusDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Cyprus.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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