Electrical characteristics of dynamic loudspeakers - Wikipedia
Archimago's Musings: MEASUREMENTS: Speaker Impedance - Part 2; sealed, ported, and a few of my speakers...
Resonant Frequency - Stetron Resonant Frequency
Loudspeakers
Resonance Guide Audio Wireless Tws Compact Mini Bass Speaker - Temu
Amazon.com: Walfront Resonance Speaker,1Pcs 50MM 2Inch All Frequency Resonance Speaker Vibration Strong Bass Louderspeaker (4Ω,25W) (1) : Electronics
Amazon.com: Walfront Resonance Speaker,1Pcs 50MM 2Inch All Frequency Resonance Speaker Vibration Strong Bass Louderspeaker (4Ω,25W) (1) : Electronics
Amazon.com: Resonance Speaker Bluetooth Vibration Speaker 50MM 2Inch All Frequency Resonance Speaker Vibration Strong Bass Louderspeaker Compatible with Computer Laptop MP3 MP4 CD Mobile Phone PSP(4Ω 25W) : Electronics
Speaker Resonances - The Good, the Bad and the Ugly | Audio Science Review (ASR) Forum