Question 1

how many volts do i have to put in it?

Accepted Answer

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.

Question 2

Is  one of the dimension really 4.5 inches

Accepted Answer

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.

Question 3

If I use this to replace 4 ohm computer speakers driven by 8w amp and keep volume well below max will I do damage?

Accepted Answer

Probably no damage unless you hit them with more than 4 watts of power.

Question 4

Are these speakers waterproof

Accepted Answer

No. I never tested them, but they don't look like other waterproof speakers I have seen.

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	#736,115 in Electronics ( See Top 100 in Electronics ) #318 in Car Component Subwoofers
Box Contents	2 speakers
Brand Name	Gikfun
Colour	Silver
Compatible Devices	Smartphone, Tablet, Laptop, Television
Connectivity Protocol	Bluetooth
Control Method	Voice
Controller Type	Voice Control
Customer Package Type	Flat Free Package (FFP)
Customer Reviews	4.3 4.3 out of 5 stars (746)
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
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

Gikfun 2 4Ohm 3W Full Range Audio Speaker Stereo Woofer Loudspeaker for Arduino Pack of 2pcs EK1725

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