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

Product ID: 11750228

Details

Audio Output Mode
Stereo" or
Brand
Adafruit
Connectivity Technology
wired
Frequency Response
680 hertz
Speaker Maximum Output Power
0.5 watts

📏1-inch compact speaker cone

🔊0.5W max output power

⚙️8 Ohm impedance for versatile compatibility

Description

🔧 Small size, big sound — upgrade your DIY audio game!

LIGHT AS AIR - Ultra-lightweight metal body for effortless DIY projects
ECO SMART CHOICE - Revive old electronics and reduce e-waste with ease
PLUG PLAY UPGRADE - Ideal replacement for small devices like clocks & baby monitors
MINIATURE POWERHOUSE - Tiny 1" metal speaker delivers crisp sound without bulk
SEAMLESS INTEGRATION - Perfect match for Adafruit Wave Shield & Class D amps

The Adafruit Mini Metal Speaker (8 Ohm, 0.5W) is a compact, lightweight 1-inch metal speaker designed for DIY audio projects. Compatible with popular Adafruit audio shields and amplifiers, it offers clear sound output ideal for replacing tiny speakers in clocks, monitors, and other small devices, making it a smart, eco-friendly upgrade for tech-savvy creators.

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	#145,227 in Electronics ( See Top 100 in Electronics ) #1,587 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	4.2 4.2 out of 5 stars (215)
Enclosure Material	Metal
Frequency Response	680 hertz
Impedance	8 ohm
Is Waterproof	FALSE
Item Dimensions D x W x H	1.97"D x 3.54"W x 0.39"H
Item Weight	18.14 g
Manufacturer	Adafruit
Model Name	Adafruit 1890
Model Number	1890
Mounting Type	Board Mount
Number Of Circuits	1
Number of Audio Channels	1
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
Subwoofer Connectivity Technology	Wired
Subwoofer Diameter	1 inches
Tweeter Diameter	1 inches
UPC	701980281730 720189972669 748347524024
Unit Count	1 Count
Warranty Type	Limited
Water Resistance Level	Not Water Resistant
Wireless Technology	Radio Frequency
Woofer Diameter	1 inches

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