Polk Audio DB521 5.25" Coaxial Speakers Marine Certified (Pair/Certified Refurbished) MB Quart GMR-LED Source Unit To enable a smarter driving

To enable a smarter driving experience

50 ms of total delay

17-7/16"W x 7-1/2"H x 18"D (10"H with Wi-Fi antennas raised)

while a tough Santoprene® surround and marine-grade polypropylene cone pump out the bass

Dolby Atmos® and DTS:X™ ready with optional Definitive Technology DM90 add-on height module (sold separately)

Polk Audio DB521 5.25" Coaxial Speakers Marine Certified (Pair/Certified Refurbished) MB Quart GMR-LED Source Unit To enable a smarter drivingWhat are Certified Refurbished Specials? Electronics Expo's Certified Refurbished Program was designed to give customers peace of mind when purchasing refurbished units from Electronics Expo. Certified Refurbished products go through meticulous inspection processes including functionality testing, basic cleaning, inspection, and repackaging. These items may have had a minor blemish, scratch or defect repaired. Certified Refurbished item are fully