Polk Audio DB522 DB+ Series 5.25 Coaxial Speakers with Marine Certification Headphone_Over Ear Vanishing Series built-in speakers are

Vanishing Series built-in speakers are virtually indistinguishable from their surroundings

2-way car speakers (pair)

Fewer complaints from neighbors in apartments and townhouses

AM loop antenna

the auto connection function automatically connects the two units

Polk Audio DB522 DB+ Series 5.25 Coaxial Speakers with Marine Certification Headphone_Over Ear Vanishing Series built-in speakers areDynamic Balance: Dynamic Balance is a proprietary Polk Audio technology using laser imaging to determine what combination of speaker materials create the least amount of resonance. Eliminating resonance in speakers results in a wide, smooth response and low distortion. Marine Certification: Polk speakers are marine certified, making them a good choice for boats in fresh water, convertibles, motorcycles, ATVs, and other applications where the speaker