Infinity INF6952M 6952 M 6 x 9 in. 2-Way Speakers - 300 Watts, White Go to amazon.com Related posts Thing need consider when find 77mm speaker? FeatureCoaxial Marine Speakers 300WMounting Depth: 3-1/32" (77mm)Mounting Diameter: 8-19/32" x 5-3/4" (219mm x 145mm)Power Frequency Response: 36-20,000HzRMS:100W Description6952M 6" x 9" 2-Way Speakers - 300W - (Pair) White6" x 9" Coaxial Marine Speakers300W Handling PowerFequency Response: 36-20,000HzMounting Depth: 3-1/16"Installation Size: 5-9/16" x 8-9/16"