Autobacs M402 4 Inch 2-Way Marine Speaker in White with IP56 Waterproof Rating
The Autobacs M402 is a 4-inch (100mm) 2-way marine speaker in white, handling 80W maximum and 20W nominal power at 3.6 ohm impedance. The polypropylene cone and mylar tweeter are built for waterproof marine and outdoor use with an IP56 rating, and the 39mm mounting depth suits installations with restricted cavity space. An EVA mounting gasket and hardware are included.
Product overview
The M402 is designed for marine and outdoor audio applications where waterproof construction and shallow mounting depth are priorities. The IP56 rating confirms protection against dust ingress and powerful water jets from any direction, making the speaker suitable for exposed positions on vessels, outdoor entertainment areas, and other wet-environment installations. The 39mm mounting depth provides fitment flexibility in shallow cavities where standard speakers would not fit.
The 2-way design combines a polypropylene cone woofer with a 30mm mylar dome tweeter, covering a frequency response of 120Hz to 20kHz at plus or minus 0dB. The treated cloth surround provides long-term durability in humid and wet conditions. An EVA mounting gasket is included to seal the speaker against the mounting surface, and all necessary mounting hardware is supplied in the box.
Features and benefits
IP56 waterproof rating: Protection against dust ingress and powerful water jets from any direction, suited to exposed marine, outdoor, and wet-environment speaker installations.
Polypropylene cone construction: The polypropylene cone resists moisture and UV exposure, maintaining structural integrity and audio performance in marine and outdoor environments over the long term.
30mm mylar dome tweeter: The mylar dome tweeter delivers clear high-frequency reproduction across the 2-way system, extending the frequency response to 20kHz.
Treated cloth surround: The treated cloth surround provides flexibility and durability in humid and wet conditions, resisting degradation from moisture exposure.
39mm shallow mounting depth: The 39mm mounting depth allows the M402 to be fitted in locations with restricted cavity space where deeper speakers would not suit.
80W maximum power handling: Handles up to 80W maximum input with a 20W nominal rating, providing sufficient headroom for marine and outdoor audio applications.
EVA mounting gasket included: The included EVA gasket seals the speaker against the mounting surface, preventing water ingress around the speaker cutout.
Technical specs
| Specification |
Detail |
| SKU |
M402 |
| Brand |
Autobacs |
| Type |
2-way coaxial |
| Driver Size |
4 inches (100mm) |
| Driver Material |
Polypropylene |
| Tweeter Size |
30mm |
| Tweeter Material |
Mylar |
| Surround |
Treated cloth |
| Max Power |
80W |
| Nominal Input Power |
20W |
| Frequency Response |
120Hz to 20kHz (+/-0dB) |
| Fs |
122Hz |
| Sensitivity (2.83V/1m) |
90dB |
| Sensitivity (dB/W/1m) |
87dB |
| Nominal Impedance |
3.6 ohm |
| Voice Coil Diameter |
19mm |
| Voice Coil Type |
AVS |
| IP Rating |
IP56 |
| Mounting Depth |
39mm |
| Mounting Hole Diameter |
93mm |
| Colour |
White |
| Sold As |
Pair |
Frequently asked questions
Are the M402 speakers sold as a single unit or a pair?
The source data lists the product as speakers (plural) with mounting hardware included, confirming the M402 is sold as a pair. Contact us if you need further clarification on what is included.
What is the minimum amplifier power recommended for the M402?
The M402 has a nominal input power rating of 20W and handles up to 80W maximum. An amplifier rated between 20W and 80W per channel at 4 ohm is recommended for best performance. Contact us for amplifier pairing advice.
Is the M402 suitable for use in saltwater marine environments?
The IP56 rating confirms protection against dust and powerful water jets. Contact us for further guidance on long-term suitability in saltwater marine environments for your specific installation.
What mounting hole diameter does the M402 require?
The M402 requires a mounting hole diameter of 93mm and has a mounting depth of 39mm.
Does the M402 include a crossover?
The source data does not confirm whether a dedicated crossover is included with the M402. Contact us for further information on the crossover configuration for this speaker.
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