MR50B Marine Speakers: Key Buying Tips
By BOSS Audio Systems | Life at Full Volume | Published: 2026-10-28
Category: Buying Guides
A practical guide to the BOSS Marine MR50B 5.25-inch speakers: what they do well, where they fall short, and how to decide if they fit your boat audio upgrade.
Quick answer
The BOSS Marine MR50B is a solid entry-level 5.25-inch speaker for boat owners on a budget, but its moderate power handling and size limit its performance in larger or louder setups.
Power and sound expectations
The MR50B delivers 150 watts total power, which is sufficient for casual listening at anchor or on small craft. However, if you plan to compete with wind and engine noise at speed, you may find the output lacking without an external amplifier.
Size and fit considerations
At 5.25 inches, these speakers fit many common cutouts in smaller boats, personal watercraft, and utility vessels. Measure your existing hole diameter and mounting depth before ordering—larger 6.5-inch openings will require an adapter plate.
Your MR50B decision rules
- Measure your cutout first: Check that your boat has a 5.25-inch speaker opening. If the hole is larger, you will need an adapter. If smaller, these speakers will not fit without modification.
- Match power to your setup: The MR50B handles 150 watts total. For head-unit-only use, that is fine. If you add an amplifier, ensure the amp's RMS output does not exceed the speaker's rating to avoid damage. Consider a lower-power amp or skip the amp entirely for this speaker.
- Assess your listening environment: In a small boat or at low speeds, the MR50B provides clear sound. In a large open deck or at high RPM, wind noise will overpower the speaker without extra amplification. If you often cruise at speed, look at higher-power marine speakers.
Product facts
- MR50B: The BOSS Marine MR50B is a 5.25-inch full range speaker with a 2-way system and a 1-inch dome tweeter. The separate tweeter helps deliver clearer highs than a single full-range cone, making voices and instruments more distinct on the water.
MR50B
Who should buy the MR50B?
Best for
- Boaters on a budget who want a simple upgrade from factory speakers
- Small boats, kayaks, or personal watercraft where space and power are limited
Not for
- Large decks or high-speed boats where loud, clear audio at speed is required
- Audiophiles needing deep bass or high SPL without an external subwoofer
