[. . . ] The speakers are rather heavy which must be taken in consideration at the install. [. . . ] The MBU5/MBU6 are well suited for use in garden teraces and public use like shops, restaurants etc. Safety Considerations for boat installation: Your speakers must be installed in a manner which does not interfere with your vessel's factory installed electronic devices. You should also take the time to securely mount them so that they does not come loose in the event of a collision or a sudden jolt to the vessel. - Check before drilling any holes in your vessel to make sure that you will not be drilling through the hull, a fuel tank, fuel line, wiring harness or other vital vessel system. ) by carefully routing them, tying them down and using grommets and loom where appropriate. For technical assistance ask the shop where the product was sold or the distributor in your country. [. . . ] 2-way bass reflex in ABS-plstic White or dark grey 4 ohm MBU5: 5, 25" ( 13 cm) MBU6: 6, 5" (16, 5 cm) 28 mm /1, 1" soft dome MBU5: 100 Watt MBU6: 150 Watt MBU5: 200 Watt MBU6: 300 Watt MBU5: 60 Hz - 20 kHz MBU6: 45 Hz - 20 kHz 91 dB / W / m -20 C - +85 C MBU5: B: 300 mm, H: 190 mm, D: 165 mm MBU6: B: 310 mm, H: 220 mm, D: 190 mm MBU5: 4 kg / 9 lbs MBU6: 4, 3 kg / 9, 5 lbs [. . . ]