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 Stereo Speaker for Arduino 2 Pack Silver

产品编号: 263688870

细节

Audio output mode
Stereo
Brand
Gikfun
Connectivity technology
Coaxial
Mounting type
Flush Mount
Speaker maximum output power
3 Watts

⚡4 Ohm impedance

📏2-inch full-range driver

🔊3W power output

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描述

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

ARDUINO READY - Seamlessly integrates with Arduino and Raspberry Pi projects
PRECISION AUDIO - 2-inch full-range dynamic driver for clear stereo sound
DIY AUDIO UPGRADE - Perfect for prototyping, educational projects, and custom HiFi builds
COMPACT POWERHOUSE - 3W output delivers surprisingly rich sound for its size
DUAL PACK ADVANTAGE - Two speakers included for immersive stereo setups

The Gikfun EK1725 is a 2-pack of 2-inch, 3W, 4 Ohm full-range stereo speakers designed for Arduino and DIY electronics projects. These compact woofers deliver clear, balanced sound ideal for small-scale audio systems, educational kits, and custom HiFi setups, making them a must-have for tech-savvy creators seeking quality and versatility.

规格

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
Brand	Gikfun
Built-In Media	2 speakers
Color	Silver
Compatible Devices	DIY electronics projects, Arduino, Raspberry Pi
Connectivity Protocol	Coaxial cable
Connectivity Technology	Coaxial
Control Method	Voice
Controller Type	Volume control
Customer Package Type	Flat Free Package (FFP)
Customer Reviews	4.3 4.3 out of 5 stars (729)
Enclosure Material	Plastic
Impedance	4 Ohms
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
Maximum Range	20 Meters
Model Name	EK1725
Model Number	LYSB01CHYIU26-ELECTRNCS
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
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

Z**Y

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

Fit perfect and sounds good.

6.01.2026

D**R

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

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

16.09.2024

M**L

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

3.10.2025

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