Professional ambient noise measurement and monitoring system
Autonomous sound level meter with 1/3 octave spectral analysis, continuous 24/7 recording and remote management.
Available versions
Three formats, one precision
Choose the configuration that best suits your installation. Same measurement engine across all versions.
Best seller
Integrated display
7" DSI touchscreen directly attached to the unit. Full operation without any external devices.
- 7" touchscreen (800×480)
- Fullscreen kiosk interface
- No keyboard or mouse needed
- Ideal for fixed installations
- Additional web access included
HDMI display
Connect any HDMI monitor or screen. Ideal for large display visualisation or existing monitors.
- Standard HDMI output
- Compatible with any monitor
- Large screens for control rooms
- HDMI touch support
- Additional web access included
Web only
No local display. 100% remote management via web interface from any device on the network. The most compact unit.
- Ultra-compact form factor
- 100% remote management
- Access from mobile, tablet or PC
- Ideal for hidden installations
- Lower power consumption
Explore the capabilities
Two modes of use, one system
Professional interface
Software designed for acoustic control
Web interface accessible from any device. All measurement data at a glance.
Main screen
Real-time measurement dashboard
Simultaneous display of dBA and dBC levels with clear indication of status against configured limits. Measurement mode selector (Lmax, SPL 1s, LEQ 5s) and weighting (A, C, A+C). Segment bar with the last 30 minutes of activity.
Visual alerts
Immediate exceedance detection
When sound levels exceed configured limits, indicators change colour and show the required correction in dB. Amber or red borders for instant identification of exceedance status.
Time evolution
Live graph (30 minutes)
Continuous graph of dBA and dBC levels with overlaid limit lines. Display of Lmax, instantaneous values, average delta and current delta. Impulsive mode configuration for peak detection.
Frequency analysis
1/3 octave frequency spectrum
Spectral analysis bars from 40 Hz to 16 kHz with overlaid average curve. Maximum average, dominant frequency, peak levels and simultaneous dBA and dBC values. Essential tool for acoustic diagnostics.
Exceedance control
Exceedance method comparison
Integrated view of limits, current levels, L90 statistic and suggested correction. Exceedance evolution graph with multiple simultaneous metrics (LAeq 5s, LAeq 30s, both weightings). Visual limit line for immediate reference.
Limits & presets
Advanced limit configuration with presets
Set independent dBA and dBC limits with configurable warning and alert thresholds. Preset system with 5 slots to save and load complete configurations instantly — ideal for switching between scenarios (concert, DJ, rehearsal) with a single touch. Active preset indicator visible at all times.
Reports & records
Acoustic measurement report with PDF export
Complete reports with session statistics, exceedance percentage, time-series graphs and average frequency spectrum. Direct PDF download.
Central Server
Multi-device cloud supervision
Centralise the management of all your LEVELAD devices on a dedicated server. Real-time monitoring, advanced analytics, regulatory compliance and automatic alerts.
Multi-device dashboard
Real-time display of dBA, dBC, Peak Maximum, Leq 5s, 1min and 5min for all devices. Health monitoring of each device: CPU, temperature, RAM and disk. Traffic-light status indicators.
Comparative analysis
Compare levels and spectra between devices or between periods of the same device. Difference charts, statistics and CSV/PDF export.
Correlation engine
5 source↔receiver analysis techniques: temporal cross-correlation, spectral fingerprint (31 bands), window coherence (Pearson), event detection (>6 dB) and LA90 background residual. Weighted global verdict with ISO 1996-2 verification.
Regulatory compliance
Automatic calculation of Ld, Le, Ln and Lden indices per EU Directive 2002/49/EC and Spanish Royal Decree 1367/2007. Configurable limits by acoustic zone type. Continuous compliance evaluation.
Alerts & automatic reports
Email, Telegram and SMS notifications when exceedances, disconnections or infrastructure issues are detected. Automatic daily PDF reports with full charts and statistics.
Remote updates
Update the software on all devices from the central server without physical intervention. Version control, change history and automatic rollback on failure.
Centralised monitoring
Multi-device control panel
Unified view of all devices with real-time dBA/dBC levels, Peak Maximum, LEQ 5s, 1min and 5min. Health status for each device: CPU, temperature, RAM and disk. Traffic-light status indicators.
Comparative analysis
Device and spectrum comparison
Overlay level graphs from two devices or two different periods. Difference chart, statistics (mean, maximum, deviation) and direct CSV and PDF export.
Correlation engine
Source ↔ Receiver Correlation
Analyse the causal relationship between noise source and receiver point. Weighted global verdict with 5 independent techniques. Source-receiver difference verification per ISO 1996-2. Technical correlation report generation.
Regulatory compliance
Continuous environmental assessment
Automatic calculation of Ld (day), Le (evening), Ln (night) and Lden (weighted global) indices. Data coverage bars per period. Evaluation against Royal Decree 1367/2007 limits by acoustic area type.
Features
Everything you need in a single device
Designed for professionals who require reliable, continuous and accessible measurements.
Real-time measurement
Instantaneous SPL, LEQ 1s and LEQ 5s with A and C weighting. Configurable refresh rate from 250ms to 4 seconds.
Live graph
Visual history of the last 30 minutes of sound level. Ideal for observing trends and peaks in real time.
1/3 octave spectrum
Complete frequency analysis with third-octave band bars. Weighted response according to active configuration.
Limits & presets
Set dBA/dBC noise thresholds with time slots. 5 presets to switch configurations instantly. Visual alerts with configurable warning and exceedance levels.
Continuous logging & reports
Permanent local storage of all measurements. PDF report generation by period with complete statistics.
Remote supervision
Web access from any device on the same network. Centralised management of multiple devices via VPN. Built-in REST API.
Applications
Where Levelad makes the difference
Construction sites
Acoustic emission control in civil works. Regulatory compliance with documented records.
Entertainment venues
Sound level monitoring in concert halls, nightclubs and bars. Real-time alerts to staff.
Industry
Industrial noise control at facility perimeters. Continuous recording for environmental audits.
Sensitive environments
Hospitals, schools, libraries. Silent monitoring with discreet visual alerts.
Public administration
Reference measurements for municipal ordinances. Objective data for neighbourhood noise complaints.
Acoustic consultancy
Field tool for acoustic studies. Calibrated measurements with reference microphone.
Specifications
Technical data
🎙️ Measurement
💻 Software
🔒 Security & management
Why Levelad?
Key advantages
100% autonomous
Works without a PC, without a server, without internet. Plug in and measure.
Integrated touchscreen
Full operation from the touchscreen, no keyboard or mouse needed.
Uninterrupted recording
Data stored locally 24/7. No data loss during disconnections.
Multi-device
Manage dozens of devices from a central server. Scalable without limits.
Calibrated microphone
UMIK-1 with individual factory calibration. Measurement traceability.
Remote updates
Software remotely updatable via VPN. No physical intervention required.
Professional PDF reports
Automatic generation with charts, statistics and frequency spectrum.
Competitive cost
Standard hardware and proprietary software. Much more affordable than traditional equipment.
Frequently asked questions
All about LEVELAD
What is LEVELAD?
LEVELAD is a professional ambient noise measurement and continuous monitoring system. It measures sound levels in dBA and dBC in real time, performs 1/3 octave spectral analysis (40 Hz – 16 kHz) and generates automatic PDF reports. It operates 24/7 autonomously, without a PC or internet connection.
Does it need an internet connection to work?
No. LEVELAD operates completely autonomously without an internet connection. All measurements are stored locally. A network connection is only needed for remote web access or synchronisation with the central server, both optional features.
What microphone does it use and how is it calibrated?
It uses the miniDSP UMIK-1 USB microphone, which comes with individual factory calibration via a unit-specific correction file. This ensures traceability and accuracy of all measurements.
Does it comply with noise regulations?
Yes. The central server automatically calculates Ld, Le, Ln and Lden indices in accordance with Spanish Royal Decree 1367/2007 and European Directive 2002/49/EC. It allows configurable limits by acoustic zone type and continuously evaluates compliance.
How many devices can be managed simultaneously?
There is no limit. With the central server you can monitor dozens of LEVELAD devices simultaneously, compare data between devices, analyse source-receiver correlations and receive automatic alerts from all of them.
Can the device be accessed remotely?
Yes. Each device has a web interface accessible from any browser on the local network. For secure remote access from any location, VPN (Tailscale) is used. It also has a REST API for integration with external systems.
The challenge
Acoustic control at live events
Concerts, festivals and outdoor events create a critical challenge: ensuring regulatory compliance without limiting the audience experience.
| Problem | Consequence |
|---|---|
| Neighbourhood noise complaints | Fines from €300 to €300,000 |
| Spot measurements by deployed technician | High cost, limited coverage, no continuity |
| Unknown actual level at receivers | Inability to adjust PA in real time |
| Dispute over noise source | No objective evidence for authorities |
| Inability to prove compliance | Legal liability for the organiser |
The solution
Multi-receiver monitoring network
LEVELAD deploys a network of devices that simultaneously monitors the sound source and multiple receivers, correlating both measurements in real time.
🖥️ Control Panel
Map · DECISION · Live charts
📡 Source
Stage / PA
📍 Receiver 1
North facade
📍 Receiver 2
Residential area
📍 Receiver N
Hospital / school
| Feature | Traditional measurement | LEVELAD |
|---|---|---|
| Temporal coverage | Spot samples (minutes) | Continuous 24/7 throughout the event |
| Measurement points | 1-2 manual points | Network of simultaneous receivers |
| Source discrimination | Technician's opinion | Automatic objective determination |
| Real time | Results hours/days later | Live control panel |
| Alerts | Nobody warns until the complaint | Automatic email, Telegram and SMS |
| Documentation | Manual report afterwards | Continuous recording with traceability |
Features
Comprehensive acoustic impact control
Everything an organiser, sound engineer or authority needs to manage event noise.
DECISION panel
Main indicator showing at all times how many dB above or below the limit the event is. Immediate colour code: green (compliant), yellow (approaching), red (exceedance).
Interactive map
Geographic view with the source position and all receivers, coloured according to their real-time compliance status.
Correlation & attribution
Analysis engine that determines what proportion of noise at each receiver comes from the event versus pre-existing ambient noise. Verification per ISO 1996-2.
Regulatory compliance
Ld, Le, Ln and Lden indices calculated automatically per EU Directive 2002/49/EC. Configurable limits by acoustic zone and time slot.
Multi-channel alerts
Automatic notifications via email, Telegram and SMS when exceedances are detected. The PA engineer can correct in real time before a complaint arrives.
LIVE mode for events
Real-time correlation analysis during the event. The DECISION panel updates continuously with emission level and compliance status.
Supervision panel
This is how it looks in production
Real screenshots of the centralised control panel during multi-device supervision.
Centralised monitoring
Real-time multi-device panel
Unified view of all deployed devices. dBA/dBC levels, Peak Maximum, LEQ per receiver. Health status for each device with traffic-light indicators.
Correlation engine
Source ↔ receiver analysis
Automatic determination of what proportion of measured noise comes from the event. Weighted verdict with multiple analysis techniques and ISO 1996-2 verification.
Regulatory assessment
Continuous regulatory compliance
Ld, Le, Ln and Lden indices calculated automatically. Data coverage bars per period. Evaluation against Royal Decree 1367/2007 limits by acoustic area type.
Workflow
How it works during an event
Deployment
LEVELAD devices are installed at the source (stage) and receiver points (facades, residential areas). Each device self-registers on the server.
Continuous monitoring
Devices measure and send data to the central server. The panel shows in real time the level at each receiver and whether it comes from the event or the ambient.
Alert & correction
If a receiver exceeds the limit, an automatic alert is sent to the sound engineer, who reduces PA volume. The panel confirms correction within seconds.
Documentation
At the end of the event, a complete report is automatically generated with full measurement traceability, regulatory compliance and correlation analysis.
Use cases
Event applications
Festivals
Multiple stages, several days. Simultaneous control of all emission points and perimeter receivers with full traceability.
Concerts
Direct feedback to the PA engineer. The DECISION panel indicates at all times whether receiver levels comply with limits.
Town festivals
Multi-day events with variable schedules. Configured time slots automatically apply night-time penalties.
Public administration
Objective data for issuing licences, managing complaints and resolving proceedings with traceable documentation.
Permanent monitoring
Industrial, airport or infrastructure. Continuous 24/7 supervision with alerts and automatic regulatory reports.
Acoustic consultancy
Measurement campaigns with multiple points and source-receiver correlation analysis. Technical reports compliant with regulations.
Competitive advantages
Benefits for every stakeholder
Sound engineer
Real-time feedback of receiver levels. Adjust the PA with objective data, not blindly.
Organiser
Complete documentation to prove compliance against any complaint or inspection.
Authorities
Objective, traceable data for licence granting and resolving enforcement proceedings.
Neighbours
Assurance that an effective control system exists and the event respects legal limits.
Legal advisor
Records with evidential value: continuous, calibrated data with full temporal traceability.
Acoustic consultant
Professional tool with source-receiver correlation, background subtraction and ISO 1996-2 verification.