Boss Audio MR50B 5.25" 2-Way Marine Speakers — Black, 1 Pair
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5.25" 2-Way Marine Speakers — Black, Sold as a Pair
The Boss Audio MR50B is a compact 5.25" 2-way marine speaker pair built for vessels where a full 6.5" speaker won’t fit — smaller boats, tight mounting locations, or factory speaker cutouts sized for 5.25". The 30oz magnet structure and poly injection cone deliver solid output for the size, while the 1" Mylar dome tweeter handles high-frequency clarity. Black grilles suit dark-hardware helm stations and modern boat aesthetics.
At 90dB sensitivity and 4 ohm impedance, these speakers are compatible with most marine head units and receiver packages without requiring an external amplifier. The 150W peak power handling gives headroom for higher-output receivers.
Specifications
- Size: 5.25" (5-1/4")
- Configuration: 2-way
- Power handling: 150W peak
- Impedance: 4 ohm
- Frequency response: 120 Hz – 18 kHz
- Sensitivity: 90 dB (1W/1M)
- Magnet: 30 oz
- Cone material: Poly injection
- Voice coil: 3/4" aluminum
- Tweeter: 1" Mylar dome
- Grilles: Plastic
- Finish: Black
- Quantity: 1 pair (2 speakers)
- SKU: 153-MR50B
Best Use Case
The MR50B is the right choice when a 5.25" mounting footprint is required — replacing factory speakers in smaller vessels, fitting tight mounting locations, or working within a specific cutout size. The 90dB sensitivity means they’ll perform well with standard marine head units without needing an amplifier. The black finish suits dark-hardware and modern helm aesthetics. If your mounting location accommodates 6.5", the larger speaker format will generally deliver better low-frequency output and overall volume.
Also Consider
- Boss Audio MRGB65 6.5" Marine Speakers with RGB Lighting — White — larger format with RGB accent lighting
- Boss Audio MCK632WB64 Marine Audio Kit — complete system with receiver and 6.5" speakers
- Boss Audio TUBE Portable Marine Bluetooth Speaker — portable, no-install option
- Browse all Navigation & Electronics
Parts Desk Insights
SKU 153-MR50B follows the Boss Audio prefix pattern used throughout this catalog — brand attribution as Boss Audio should be confirmed with the supplier if the customer asks for brand confirmation. The 5.25" size is the key selection factor: confirm the customer’s mounting cutout diameter before recommending this vs. the 6.5" models. The 4 ohm impedance is standard and compatible with virtually all marine head units. The 150W peak rating is a marketing figure — the continuous/RMS rating is not listed in the available data; confirm with supplier if a customer asks for RMS output. No RMS wattage or waterproof/weatherproof rating is listed in the available product data — confirm both with supplier before sale if the customer asks.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.