4" 100 Watt Box Speakers


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Owners Manuals

  • English User Manual (1.51 MB PDF) Download
  • German User Manual (734.44 KB PDF) Download
  • Spanish User Manual (740.54 KB PDF) Download
  • French User Manual (739.97 KB PDF) Download
  • Italian User Manual (735.18 KB PDF) Download

Mounting Resources

  • MS-OS420 Mounting Template (382.04 KB PDF) Download

Warranty & Compliance

  • FUSION Speaker CE Certificate (113.83 KB PDF) Download

Product Specifications

Peak Power: 100 Watts
RMS Power: 25 Watts
Woofer Size: 4"
Cone Material Polypropylene/NBR Surround
Enclosure Type: Sealed
Efficiency (1W/1M): 86dB W/M
Frequency Response: 80Hz - 20kHz
Impedance: 4 Ohm

Tweeter Specifications

Tweeter Type: PEI Cone

4" 100 Watt Box Speakers

Great for on your boat or outside your home, the MS-OS420 2-Way 100W Box Speakers are carefully designed and manufactured specifically for marine and outdoor use.

Featuring an adjustable mounting bracket with all mounting hardware supplied, these speakers can be easily mounted anywhere. They are perfect for installation on an alloy vessel where flush mount speakers are not always practical.

The solid construction and powerful sound, combined with competitive pricing, make the MS-OS420 speakers a great value-for-money option.


Versatile Speaker Solution – Perfect for boats that do not have space for speaker cut outs, simply mount the speakers anywhere for quick and easy installation.

Engineered for the Marine Environment – The versatile MS-OS420 speakers have been designed specifically for use outdoors and in a marine environment.  

All Mounting Hardware Included – The MS-OS420 speakers are supplied with an adjustable mounting bracket and the hardware required for installation.

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