Polk Audio DB522 DB+ Series 5.25 Coaxial Speakers with Marine Certification ADQHDMIBB5M Two of the tube inserts

Two of the tube inserts feature threaded tilt adjustment screws that lengthen the insert from 2

Combining practical functionality with the control of a central mixer section

Wired Connectivity

The silver-plated push terminals offer convenient connections and provide excellent signal transfer

Polk Audio DB522 DB+ Series 5.25 Coaxial Speakers with Marine Certification ADQHDMIBB5M Two of the tube insertsDynamic 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