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

ID del producto: 32098629

Transacción segura

Detalles

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

📏2-inch compact driver

🔊3W power punch

🎛️4Ω impedance perfect match

Descripción

🎧 Elevate your DIY audio game with pro-grade sound in a pint-sized package!

DIY DREAM TEAM - Perfect for Arduino projects and hobbyists craving hands-on audio innovation.
PRECISION AUDIO - Resonance frequency at 190Hz ±20% ensures balanced bass and clear mids.
COMPACT POWERHOUSE - 2" full-range drivers deliver crisp stereo sound in a sleek, space-saving design.
PLUG PLAY VERSATILITY - Wired connectivity with 4Ω impedance fits seamlessly into your custom setups.
PRO LEVEL SOUND PRESSURE - 77dB ±3dB SPL output for immersive audio without distortion.

The Gikfun 2" 4Ohm 3W Full Range Audio Speaker (Pack of 2) is a compact, wired woofer designed for Arduino and DIY audio projects. Featuring a 4Ω impedance and 3W power output, it delivers clear stereo sound with a resonance frequency around 190Hz and a sound pressure level of 77dB, making it ideal for hobbyists and educational use.

Presupuesto

Is Electric	Yes
Power Source	Corded Electric
Number of Power Levels	1
Speaker Maximum Output Power	3 Watts
Subwoofer Connectivity Technology	Wired
Connectivity Technology	轴电缆
Audio Driver Size	4E+1 Millimeters
Audio Driver Type	Dynamic Driver
Item Weight	0.1 Kilograms
Item Dimensions D x W x H	1.1"D x 4.5"W x 2.5"H
Unit Count	1 Count
Impedance	4 Ohm
Number of Audio Channels	2.0
Compatible Devices	MP3播放器
Speaker Size	2 Inches
Woofer Diameter	5.08 Centimeters
Tweeter Diameter	2 Inches
Water Resistance Level	Not Water Resistant
MP3 player	No
Specific Uses For Product	DIY electronics projects, Arduino-based prototyping, small-scale audio systems, educational projects for learning about audio technology
Controller Type	Volume control
Color	Silver
Is Waterproof	FALSE
Maximum Range	20 Meters
Control Method	Voice
Audio Output Mode	Stereo
Mounting Type	Flush Mount
Speaker Type	Woofer
Additional Features	bass_boost
Recommended Uses For Product	Volume
Subwoofer Diameter	2 Inches