Standard Horizon MH73A4B Submersible Speaker Microphone
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Standard Horizon MH73A4B Submersible Speaker Microphone
The Standard Horizon MH73A4B is a compact, submersible external speaker microphone compatible with Standard Horizon VHF radios that have a speaker mic connection. It delivers loud, clear audio in a rugged, waterproof housing designed for demanding marine environments.
Part Information
- Model: MH73A4B
- SKU: 783-MH73A4B
- Brand: Standard Horizon
- Official Product Type: Submersible External Speaker Microphone
- System: Marine VHF Radio — Speaker Microphone Accessory
- Waterproof Rating: IP57 — submersible to 3 ft (1 m) for up to 30 minutes
Compatible Applications
- All Standard Horizon VHF radios equipped with a speaker mic connection
- Standard Horizon GX6000 Quantum AIS Fixed VHF Radio
- Standard Horizon GX2410GPS Matrix AIS+GPS Fixed VHF Radio
- Standard Horizon HX320 Floating Handheld VHF Radio
- Standard Horizon HX380 Commercial Grade Handheld VHF Radio
- Standard Horizon HX400IS Intrinsically Safe Handheld VHF Radio
- Standard Horizon HX400S Commercial Handheld VHF Radio
- Confirm speaker mic connector compatibility with your specific radio model before ordering
Key Features
- Submersible: IP57-rated — protected against submersion to 3 ft (1 m) for up to 30 minutes
- Loud Audio: High-output speaker for clear communications in noisy marine environments
- Rugged Construction: Built for onboard use in wet and demanding conditions
- Compact Design: Easy to clip or mount at the helm or on a life jacket
- Broad Compatibility: Works with all Standard Horizon VHF radios with a speaker mic port
Parts Desk Insights
Best Use Case: The MH73A4B is the right choice for operators who need hands-free or remote microphone access from a fixed-mount VHF radio, or for handheld radio users who want a louder, more durable speaker mic for use in high-noise environments like open cockpits, engine rooms, or commercial decks. Its IP57 submersible rating makes it suitable for use in wet conditions where a standard speaker mic would not hold up.
Related Products
- Standard Horizon GX6000 Quantum AIS Fixed VHF Radio
- Standard Horizon GX2410GPS Matrix AIS+GPS Fixed VHF Radio
- Standard Horizon HX400IS Intrinsically Safe Handheld VHF Radio
- Standard Horizon HX400S Commercial Handheld VHF Radio
- Standard Horizon HX891BTBK 6W Handheld VHF/GPS/Bluetooth Radio
- Standard Horizon CMP460 Submersible Speaker Mic
- Standard Horizon MEK4 Front Panel Mic Extension Kit
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 1-3 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.