Polk Audio DB522 DB+ Series 5.25 Coaxial Speakers with Marine Certification ADQHDMIBB5M Immersive 3D surround sound: 7

Immersive 3D surround sound: 7 speakers and built-in 4" dual subwoofers for sharp fidelity

The spring terminals will accept up to 10 AWG speaker wire

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

Wired Connectivity

Polk Audio DB522 DB+ Series 5.25 Coaxial Speakers with Marine Certification ADQHDMIBB5M Immersive 3D surround sound: 7Dynamic 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