can I directly connect it to 3.5mm audio jack? or should I have a capacitor in between? the sound is very very low right now.

You'll need to incorporate a LM386 operational amplifier. Google search "lm386 audio amplifier circuit diagrams", test one out on a breadboard, and change capacitor and resistor values until you find the sound you like.

How can you tell which are the positive and negative wires? Picture shows both as white

I don’t believe it makes a difference

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Mini Metal Speaker w/Wires - 8 ohm 0.5W [ADA1890]

Product ID: 286990258

Details

Brand
Adafruit
Speaker maximum output power
0.5 Watts
Connectivity technology
wired
Audio output mode
Mono
Mounting type
Board Mount

⚡0.5W power handling for efficient audio

🔊8 Ω impedance for crisp sound

🛠️1" metal cone, ultra-lightweight build

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Description

🔊 Small Speaker, Big Impact: Elevate your sound game with precision and style!

PLUG PLAY READY - Ideal companion for Wave shield and class D amplifier boards—just dial volume carefully to avoid overload
COMPACT POWERHOUSE - Tiny 1" diameter fits seamlessly into any sleek audio project
DURABLE METAL DESIGN - Lightweight metal cone offers longevity without compromising sound clarity
EFFICIENT ENERGY USE - Handles up to 0.5W power, perfect for low-power, high-quality setups
PRECISION AUDIO MATCH - 8 Ω impedance ensures crystal-clear sound with minimal distortion

The Adafruit Mini Metal Speaker (8 Ω, 0.5W) is a compact, lightweight 1" metal cone speaker designed for small audio projects. Perfectly matched for low-power applications and compatible with popular amplifier boards, it delivers clear sound with durable construction—just mind the volume to keep it safe.

Specifications

ASIN	B00N41FXC2
Additional Features	Lightweight
Age Range Description	All ages
Antenna Location	For DIY Electronic Audio Projects
Audio Driver Type	Dynamic Driver
Audio Output Mode	Stereo" or "Mono
Battery Average Life	4 Hours
Best Sellers Rank	#39,755 in Electronics ( See Top 100 in Electronics ) #363 in Car Coaxial Speakers
Brand	Adafruit
Built-In Media	[wires, speaker cone]
Color	silver
Compatible Devices	Desktop, Laptop, MP3 Player, Projector, Smartphone, Tablet, Television
Connectivity Protocol	Wired
Connectivity Technology	wired
Control Method	Touch
Controller Type	drawdio
Customer Package Type	Standard Box with Cushioning
Customer Reviews	4.3 out of 5 stars 210 Reviews
Enclosure Material	Metal
Frequency Response	680 Hz
Impedance	8 Ohms
Is Waterproof	FALSE
Item Dimensions D x W x H	1.97"D x 3.54"W x 0.39"H
Item Weight	0.04 Pounds
MP3 player	No
Manufacturer	Adafruit
Model Name	Adafruit 1890
Model Number	1890
Mounting Type	Board Mount
Number Of Circuits	1
Number of Audio Channels	1.0
Number of Items	2
Power Source	Corded Electric
Series Number	1890
Speaker Maximum Output Power	0.5 Watts
Speaker Size	3.5 Inches
Speaker Type	Mini
Specific Uses For Product	DIY electronic audio projects, smartphones, tablets, MP3 players, and laptops
Subwoofer Connectivity Technology	Wired
Subwoofer Diameter	1 Inches
Tweeter Diameter	1 Inches
UPC	701980281730 720189972669 748347524024
Unit Count	1.0 Count
Warranty Type	Limited
Water Resistance Level	Not Water Resistant
Wireless Technology	Radio Frequency
Woofer Diameter	1 Inches

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