The EARMOR M31 Plus is an electronically enhanced noise-canceling headset designed for specialized tasks, offering both hearing protection and enhanced situational awareness. It is certified according to ANSI S3.19-1974 and EN 352-1:2020, EN 352-4:2020, EN 352-6:2020, and EN 352-8:2020 standards, indicating its compliance with general requirements, level-dependent earmuffs, earmuffs with safety-related audio input, and entertainment audio earmuffs.
Function Description
The primary function of the M31 Plus is to protect users from harmful noise while simultaneously enhancing subtle environmental sounds and tracking human voices with high-fidelity optimization. It effectively blocks dangerous noises exceeding 82 decibels (such as explosions and gunshots). This dual capability not only safeguards hearing but also improves conversation clarity and overall situational awareness. The headset features a built-in EMI filtering system that eliminates electromagnetic interference from other electronic devices, ensuring clear audio performance. An AUX interface allows connection to smartphones, tablets, computers, and other players via a compatible 3.5mm audio cable, catering to individual entertainment needs. A newly added quick-detach function facilitates easy switching of accessory attachments in hazardous environments.
Important Technical Specifications
- Noise Reduction Rating (NRR): 22 dB (ANSI S3.19-1974)
- Single Number Rating (SNR): 29 dB (EN352-1:2020), with SNR™=30.3 / SNR=1.2
- Activation Noise Reduction Level: 82 dB
- Noise Reduction Value: 22 dB
- Microphone Sensitivity: -42dB±2dB
- Pick-up Pattern: Omnidirectional
- Speaker Type: Dynamic Coil
- Speaker Impedance: 32 OHM
- Speaker Size: 30mm
- Speaker Rated Power: ≈ 30mW
- Speaker Frequency Response Range: 20Hz-20KHz
- Audio Plug: 3.5mm AUX Input
- Operating Time: 60 hours
- Power Source: 2 x AAA Batteries
- Materials: ABS+POM+Metal
- Net Weight: 295g±10g
- Working Temperature Range: -20-60°C
- Storage Temperature Range: -40-70°C (Use after returning to operational temperature)
Attenuation Data (ANSI S3.19-1974):
| TEST FREQ.(HZ) |
125 |
250 |
500 |
1000 |
2000 |
3150 |
4000 |
6300 |
8000 |
NRR |
| MEAN ATTENUATION(DB) |
17.7 |
19.1 |
24.7 |
29.6 |
30.1 |
37.6 |
40.0 |
41.7 |
40.5 |
22 |
| STANDARD DEVEATION(DB) |
3.1 |
1.9 |
2.3 |
2.3 |
2.2 |
3.2 |
3.4 |
2.7 |
3.1 |
|
Attenuation Data (EN352-1:2020):
| SUBJECT |
63 |
125 |
250 |
500 |
1000 |
2000 |
4000 |
8000 |
SNR(dB) |
| MEANS |
20.5 |
16.4 |
21.5 |
25.4 |
29.7 |
30.2 |
41.6 |
41.3 |
29 |
| STD.DEV |
3.6 |
2.8 |
2.6 |
1.9 |
2.2 |
2.5 |
3.0 |
3.0 |
|
| MEAN-SD |
16.9 |
13.6 |
18.9 |
23.5 |
27.5 |
27.7 |
38.6 |
37.9 |
|
Usage Features
- Folding Headband: Allows for compact storage and portability.
- Adjustable Headband: Earcups slide up or down to ensure a proper fit, fully covering the ears and fitting within the ear cushion.
- Easy-access Battery Cap: Facilitates quick and simple battery replacement.
- Power/Volume Control: Intuitive buttons for managing power and adjusting volume.
- Button Operations:
- Power On: Press and hold the Power Button for 2 seconds.
- Power Off: Press and hold the Power Button for 2 seconds.
- Volume Adjustment: Click Volume+/- Button. Five volume levels are available, with "DeDe" for max volume and "DuDu" for min volume.
- Auto-off: Automatically powers off after 4 hours of inactivity.
- Low Battery Alert: Signals when battery voltage reaches 2.55V.
- Low Battery Shutdown: Triggers automatic shutdown when battery voltage drops below 2.45V.
- Quick Release for Headband Adapter: Allows for easy detachment of the earcups from the headband. To detach, rotate the plastic slider of the adapter perpendicular to the earcups, then gently pull apart to disconnect from the latch.
- Audio Input Level: The audio level is limited to 82dB when connected to a Personal Music Player (PMP) to prevent harmful noise levels. Users are responsible for setting a safe audio input level when connecting to devices with very high output.
Maintenance Features
- Regular Inspection: Earmuffs must be regularly inspected for cracks or worn parts, and replaced as needed.
- Cushion Sealing Rings: Typical life for foam cushion sealing rings is 12 months.
- Cleaning: Clean the exterior of the hearing protector regularly with soap and warm water. Do not immerse the entire headset in water.
- Storage: Do not store the hearing protector behind a windshield or at temperatures above 131°F (55°C).
- Battery Removal: If the headset is not to be used for a long time, remove the batteries to prevent leakage and potential damage.
- Chemical Substances: Certain chemical substances may damage the product; contact the manufacturer for more information.
- Damaged Components: If the microphone or any accessory is damaged or malfunctioning, cease usage immediately.
- Warranty: EARMOR® M31 Plus is warranted to be free of defects in material and workmanship for a period of 1 year from the date of original purchase. The warranty is voided if the product is broken down, reconstructed, modified by unauthorized parties, damaged through improper use, or damaged by battery leakage.
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