Sound Level dBA
Catch traffic noise, HVAC hum and fridge compressors before they ruin a take or disturb a sleeper.
The ambient floor, measured — never recorded.
Chronic ambient noise above 55 dBA raises blood pressure during sleep. Open-plan offices average 65 dBA — loud enough to cut short-term memory performance by 10%. Envora gives you the number so you can argue for a quieter room.
Built around Digital MEMS microphone · A-weighted envelope.
A digital MEMS microphone over the PDM interface samples the ambient envelope — never the waveform. Envora derives a contextual, A-weighted level and reports peaks and sustained periods. This is an environmental indicator, not a calibrated sound-level meter.
- Technology
- Digital MEMS microphone · A-weighted envelope
- Range
- Ambient indoor environments
- Accuracy
- Contextual (not a calibrated SLM)
- Resolution
- 1 dBA
- Response
- Real-time (PDM)
- Units
- dBA
Envora's MEMS microphone reports the A-weighted ambient envelope — never the audio waveform. This is an environmental indicator, not a calibrated sound-level meter.
Whisper. Bedroom target for restful sleep.
— WHO Environmental Noise Guidelines
Quiet bedroom. WHO recommendation for long-term sleep environments.
— WHO 1999 Bedroom Guidelines
Library; quiet living room.
— EPA
Quiet office; refrigerator hum.
— EPA
WHO daytime annoyance threshold. Long-term cardiovascular risk begins to rise.
— WHO Europe · Münzel et al., 2018
Normal conversation. Open-plan offices average here — short-term memory drops ~10%.
— WHO
WHO night-time outdoor threshold. Sleep disruption documented above this.
— WHO Environmental Noise Guidelines
Vacuum cleaner; busy traffic. Stress hormone elevation with chronic exposure.
— EPA
OSHA action level (8-hour TWA). Hearing-conservation programme required.
— OSHA
OSHA permissible exposure limit (8-hour). Hearing damage with prolonged exposure.
— OSHA · NIOSH
Hearing damage in 15 minutes. Chainsaw, motorbike at full throttle.
— NIOSH
Pain threshold. Immediate hearing damage risk.
— WHO
Practical steps, not panic.
- For sleep: bedroom should stay under 35 dBA through the night.
- For podcast rooms: under 40 dBA or your noise floor shows on the final mix.
- Envora never records or streams audio. Only the level envelope leaves the device.
Where this channel does its best work.
dBA, plus 10 more channels.
Envora One ships Sound Level alongside ten other channels, fused into one IAQ score and calibrated at our bench. £249 one-time. Free for personal households.
Free UK & EU shipping · 2-year warranty · 30-day returns · Reply within one UK business day.