EN 50332: acoustic safety of music players + headphones
Guide - Acoustic safety
The EN 50332 series frames the sound pressure produced by personal music players, portable players, phones and their associated headphones during personal listening. It was born from a 2009 European mandate intended to reduce individual exposure to high sound levels that may lead to noise-induced hearing loss. The standard breaks down into three parts: player + headphone set (50332-1), player and headphone sold separately (50332-2), and accumulated acoustic dose management (50332-3). This page describes the origin of the text, the split between parts, the sound-pressure limits, the measurement methods (artificial-ear coupler, HATS, pink noise and music signal), the dose model introduced in 2017, the most frequent pitfalls and the normative cross-references to IEC 62368-1 and the IEC 60318 series.
Origin and European mandate M/452
Section titled “Origin and European mandate M/452”The mass use of digital personal music players from the 2000s onwards raised a public health concern. In 2008, SCENIHR (Scientific Committee on Emerging and Newly Identified Health Risks) issued an opinion to the European Commission concluding to a significant risk of hearing disorders among regular users of personal music players at high levels, particularly young adults listening more than one hour per day at high intensity. The opinion estimated that several million European users were potentially exposed to noise-induced hearing loss (NIHL).
The Commission issued mandate M/452 in 2009 to CEN, CENELEC and ETSI, requesting the development of measurement methods and limits for the sound pressure of portable players. The normative response was spread over time: EN 50332-1 and EN 50332-2 in their current versions date from 2013, EN 50332-3 was published in 2017 to add the dose dimension and user accountability. The series is cited by IEC 62368-1 in its annex on audio output, making it a de facto reference for any consumer product with headphone output or included speakers.
Three parts, three configurations
Section titled “Three parts, three configurations”| Part | Case covered | Dominant method |
|---|---|---|
| EN 50332-1:2013 | Player and headphone supplied as a single product by the same manufacturer | Measurement of the complete combination on an artificial-ear coupler or HATS |
| EN 50332-2:2013 | Player and headphone placed on the market separately, combination decided by the user | Independent characterisation of the player (maximum output voltage on a standardised load) and of the headphone (sensitivity), with an acceptance envelope |
| EN 50332-3:2017 | Any product intended for personal listening, in addition to 50332-1 or 50332-2 | Accumulated acoustic dose management, accumulator, warning, confirmed high-level mode |
EN 50332-1 and 50332-2 are complementary and not competing: a manufacturer that sells both player + headphone packs and bare players will apply both. EN 50332-3 always overlays the two previous parts when the product has active electronics allowing measurement of the output signal (almost all modern products).
EN 50332-1: player + headphone set
Section titled “EN 50332-1: player + headphone set”EN 50332-1 applies to a product where the manufacturer supplies the player and the headphone jointly, for example a personal music player shipped with its in-ear earphones, a wireless headphone with its paired source, or a medical equipment intended for personal listening with its dedicated transducer. The method is direct: the sound pressure produced by the combination is measured on a standardised measurement device.
Measurement bench
Section titled “Measurement bench”The bench comprises:
- an artificial-ear coupler compliant with IEC 60318-4 for in-ear, IEC 60318-1 for supra-aural and circum-aural headphones, or a head-and-torso simulator (HATS) IEC 60318-7 for configurations where the placement geometry matters;
- a calibrated measurement microphone, pressure reading at the drum reference point (DRP) or brought back to the ear-canal entrance point (ERP) by a correction factor published in the IEC 60318 series;
- an analyser capable of computing the A-weighted equivalent level LAeq over the measurement duration;
- a test signal, either pink noise compliant with the EN 50332 template or a "music" signal defined by the standard (pink noise filtered to a spectrum representative of averaged music samples).
Limit and conditions
Section titled “Limit and conditions”The typical limit cited in EN 50332-1 is an LAeq of 100 dB(A) measured with the "music" signal under the positioning conditions of the standard, player set at maximum volume, with no active override mode. The exact value and tolerances are in the dedicated clause of the standard, and one should refer to the CENELEC text for the binding reading.
The music signal was chosen because pure pink noise underestimates the actual perceived loudness of a music signal: music has crest factors and tonal content that produce a different level sensation. The "music" filter brings the test exposure closer to real use.
EN 50332-2: player and headphone sold separately
Section titled “EN 50332-2: player and headphone sold separately”When the player and the headphone are placed on the market separately, the effective combination depends on the consumer. EN 50332-2 handles this case with a two-step approach.
Player characterisation
Section titled “Player characterisation”The player is characterised by the maximum RMS voltage it can deliver on a standardised load (32 ohms is the most common reference value), for a music test signal at maximum volume. This voltage is capped at the value set by EN 50332-2.
Headphone characterisation
Section titled “Headphone characterisation”The headphone is characterised by its sensitivity expressed in dB SPL per 1 V RMS applied at the terminals, measured on the artificial-ear coupler. The typical sensitivity of a commercial headphone ranges from about 90 dB SPL/V for a low-efficiency headphone to more than 115 dB SPL/V for a high-efficiency in-ear earphone.
Plausible combination
Section titled “Plausible combination”The voltage-sensitivity product gives an expected sound pressure for the combination. EN 50332-2 sets an acceptance envelope: a compliant player combined with a compliant headphone must not be able to generate an LAeq above the limit set in the standard. The mechanism is essentially a voltage limit on the player side, constraining the random walk of commercial combinations.
The common pitfall in EN 50332-2 is low impedance. A 16-ohm headphone in place of the 32 ohms presented may draw more current and, if the player is not voltage-regulated, generate a higher pressure. The standardised method therefore requires a measurement on a standardised load and a declaration of the headphone nominal impedance.
EN 50332-3: acoustic dose and accumulator
Section titled “EN 50332-3: acoustic dose and accumulator”EN 50332-3:2017 introduces active exposure management by the product itself. The principle is that instantaneous pressure is not the only quantity to control: the acoustic energy received over time (the dose) is what produces long-term hearing risk.
Dose model
Section titled “Dose model”The dose is computed as the integral of the A-weighted sound level over the exposure duration, normalised to a reference exposure. The chosen reference corresponds to an exposure of 40 hours per week at 80 dB(A), inspired by the thresholds of Recommendation 2003/10/EC for occupational noise but transposed to the consumer context.
| State | Description | Expected action |
|---|---|---|
| Normal mode | Pressure below the trigger threshold | No specific action, dose silently accumulated |
| High-level warning | The user raises the volume above the trigger threshold (typically 85 to 89 dB(A) depending on configuration) | Display of an explicit warning, request for confirmation to enter high-level mode |
| High-level mode | The user has confirmed | Playback authorised, dose accumulation continues |
| Dose reached | The accumulated equivalent dose reaches the ceiling of the time window (typically 7 days) | The device returns to normal mode, the volume is capped until the periodic reset |
| Override | Explicit user action to bypass | Allowed but logged, triggers a new warning at each session |
Typical implementation
Section titled “Typical implementation”The accumulator is typically implemented on the firmware side. The audio DSP continuously measures the A-weighted level at the headphone output, integrates the dose into a persistent variable (non-volatile memory), and compares it to a threshold. The reset can be daily, weekly or rolling depending on the manufacturer's choice within the bounds set by EN 50332-3. The visual and audible warnings must be clearly understandable, in the end user's language, and must not be suppressible by default.
Related normative framework
Section titled “Related normative framework”IEC 62368-1
Section titled “IEC 62368-1”IEC 62368-1 is the general safety standard for audio, video, IT and communication equipment. It references EN 50332 in its annex dedicated to audio output to characterise the acoustic risk to the consumer. An IEC 62368-1 declaration of conformity for a product with headphone output is incomplete without EN 50332 verification: market practice, and some notified laboratories, treat the two as a block.
Recommendation 2003/10/EC and occupational exposure
Section titled “Recommendation 2003/10/EC and occupational exposure”Recommendation 2003/10/EC (consolidated by Directive 2003/10/EC on the protection of workers from the risks of noise exposure) sets workplace exposure thresholds:
| Indicator | Value | Effect |
|---|---|---|
| Lower exposure action value | 80 dB(A) over 8 h, or 135 dB(C) peak | Worker information and training |
| Upper exposure action value | 85 dB(A) over 8 h, or 137 dB(C) peak | Mandatory hearing protection, organisational measures |
| Exposure limit value | 87 dB(A) over 8 h, protection included | Must never be exceeded, even with protection |
These thresholds do not apply directly to the consumer personal music player but constitute the clinical reference scale that guided the setting of EN 50332-3 thresholds. The scale consistency (A-weighted LAeq over a long time window) makes it possible to align consumer design with proven epidemiological data.
Link with the Low Voltage Directive and the General Product Safety Regulation
Section titled “Link with the Low Voltage Directive and the General Product Safety Regulation”For personal music players and headphones placed on the EU market, EN 50332 fits into the general product safety framework:
- the Low Voltage Directive (LVD) 2014/35/EU for electrical and thermal aspects when the product uses a mains supply or a transformer;
- Regulation (EU) 2023/988 on general product safety (GPSR), applicable since 13 December 2024, which applies to any consumer product and integrates the assessment of acoustic risks for products with audio output;
- the RED Directive 2014/53/EU for wireless headphones, where EN 50332 is cited in addition to the radio and EMC tests, and where Article 3.3 on the cybersecurity of connected equipment has applied since 1 August 2025.
Test bench: metrological details
Section titled “Test bench: metrological details”Couplers and phantoms
Section titled “Couplers and phantoms”| Reference | Application | Description |
|---|---|---|
| IEC 60318-1 | Supra-aural and circum-aural headphones | Two-volume coupler simulating the acoustic impedance of the occluded outer ear |
| IEC 60318-3 | Headphone held against the ear | 6 cm3 coupler for near-field listening |
| IEC 60318-4 | In-ear earphone | Inner-ear simulator with 711 coupler (HATS), reproduces the impedance of the occluded ear canal |
| IEC 60318-5 | Couplers for audiometry | Reference for clinical audiometric tests |
| IEC 60318-7 | Complete head-and-torso simulator (HATS) | Anthropomorphic head + torso, ears with pinna, internal microphones |
The choice of device depends on the type of headphone and on the desired geometric resolution. For a circum-aural headphone, the HATS is preferable because the pinna influences the measurement by several dB. For an in-ear earphone, the 711 coupler (IEC 60318-4) is typically sufficient.
Measurement conditions
Section titled “Measurement conditions”| Parameter | Typical EN 50332 value |
|---|---|
| Reference level | 1 kHz sinusoidal for calibration |
| Test signal | Pink noise or "music" signal filtered per the EN 50332 template |
| Measurement duration | 30 seconds to 60 seconds for the LAeq computation |
| Transducer position | Defined by the standard, headphone on HATS or earphone inserted in the 711 coupler |
| Device volume | Maximum, override mode disabled except for a specific test |
Cross-reference to ITU-T P.79
Section titled “Cross-reference to ITU-T P.79”The artificial-ear coupler methodology has a telecom antecedent. ITU-T Recommendation P.79 defines the equivalent couplers used for telephone handset tests, and the IEC 60318 series shares that lineage. A laboratory equipped for telephone handset tests under ITU-T P.79 typically has the fixtures and couplers reusable for EN 50332, with adaptations to the test signal and the LAeq computation.
Frequent pitfalls
Section titled “Frequent pitfalls”| Pitfall | Consequence |
|---|---|
| Using a low-impedance headphone (16 ohms) during EN 50332-2 tests when the player has been sized for 32 ohms | Measured pressure several dB above the expected value, probable non-conformity |
| Implementing EN 50332-3 without a persistent accumulator in non-volatile memory | Dose reset at any restart or battery change, bypass of the protective mechanism |
| Translating high-level warnings only in the original firmware language | Formal non-conformity in any national market requiring the local language (DGCCRF in France in particular) |
| Allowing an "override" mode without explicit and logged confirmation | The product loses the presumption of conformity with EN 50332-3 because the user does not give informed consent |
| Neglecting the "music" filter and testing only with pink noise | Systematic underestimation of the perceived level, gap of several dB compared to the standardised signal |
| Measuring on a generic 6 cm3 coupler instead of the 711 coupler specified for in-ear earphones | Measurement error in the range of 5 to 10 dB, non-binding result |
| Considering EN 50332 not applicable to wireless headphones (TWS) | Incorrect: the standard applies as soon as there is audio output intended for personal listening, the wireless nature does not exempt |
| Covering IEC 62368-1 without testing EN 50332 on a product with audio output | The technical file remains incomplete, probable observation in market surveillance |
| Resetting the dose at the user's discretion without a time frame | EN 50332-3 specifies a regulated time window, an arbitrary reset is not compliant |
| Omitting the HATS measurement for a circum-aural headphone and using only the basic 60318-1 coupler | Pinna effect not captured, typical measurement gap of 2 to 4 dB on some bands |
Special cases
Section titled “Special cases”Active headphones and noise cancellation
Section titled “Active headphones and noise cancellation”A headphone with active noise cancellation (ANC) modifies the acoustic signal at the transducer. EN 50332 applies to the effective output measured at the coupler, with ANC active. A special case is the transient gain increase in "transparent mode" (letting outside sounds through), which can punctually increase the measured LAeq and must be covered by tests of the worst-case combination.
Hearing aids and medical products
Section titled “Hearing aids and medical products”Hearing aids do not fall under EN 50332 but under Regulation (EU) 2017/745 on medical devices (MDR) and under IEC 60601-2-66 for specific safety requirements. The boundary between PSAP (Personal Sound Amplification Product) and hearing aid is regulatory: a PSAP intended for general leisure use falls under EN 50332, a hearing aid intended to compensate for a hearing loss falls under the MDR.
Equipment for children
Section titled “Equipment for children”Headphones intended for children additionally fall within the scope of the Toy Directive 2009/48/EC when they are presented as toys. EN 71-1 sets specific acoustic thresholds (typically 85 dB(A) for toys at ear range, 65 dB(A) for toys to be worn close to the ear) which may be stricter than EN 50332. The cumulation of the two sets of requirements is expected.
Smart Volume Control
Section titled “Smart Volume Control”The Smart Volume Control concept introduced by EN 50332-3 designates the software set responsible for level measurement, dose integration, warning triggering and capping. It is typically a component of the audio firmware (DSP + microcontroller) which must be tested not only for its acoustic function but also for its robustness (persistence in case of power loss, integrity of counters, impossibility of bypassing via an undocumented command).
Compliance procedure
Section titled “Compliance procedure”| Step | Actor | Deliverable |
|---|---|---|
| Scoping | Design house, manufacturer | Identify the applicable EN 50332 subset (1, 2, 3 or combination), choose the target coupler |
| Firmware specification | DSP / audio firmware team | Output-voltage capping algorithm, dose accumulator, warning management |
| In-house pre-tests | Manufacturer or service-provider laboratory | HATS or 711 coupler measurement, "music" signal, LAeq threshold verification |
| Accredited laboratory tests | Recognised ISO/IEC 17025 laboratory | Binding report, traced measurement conditions, reference test signal |
| Technical file | Manufacturer | Filing of the report in the IEC 62368-1 or LVD file, citation of EN 50332 clauses |
| DoC | Manufacturer or importer | Mention of EN 50332 conformity where relevant in the EU declaration of conformity |
Key takeaways
Section titled “Key takeaways”- EN 50332 is the European reference for the sound pressure of personal music players and headphones intended for personal listening, in response to Commission mandate M/452.
- Three complementary parts: 50332-1 (player + headphone set), 50332-2 (sold separately), 50332-3 (dose and accumulator).
- Typical reference limit of 100 dB(A) LAeq on the music signal for parts 1 and 2, dose management with a trigger threshold in the 80 to 89 dB(A) zone for part 3.
- Measurement methods: artificial-ear coupler (IEC 60318-1 or -4) or HATS (IEC 60318-7), standardised music signal rather than pure pink noise.
- Normative cross-reference from IEC 62368-1: a product with audio output must address EN 50332 in its safety file, not only IEC 62368-1.
- EN 50332-3 introduces a dose accumulator, a confirmed high-level warning and override traceability: all in persistent firmware.
- Clinical framework: Recommendation 2003/10/EC for occupational exposure (thresholds at 80, 85, 87 dB(A) over 8 h) serves as the reference scale, without applying directly to the consumer personal music player.
Further reading
Section titled “Further reading”- CE procedure: general framework for consumer product conformity, within which EN 50332 sits.
- CE harmonised standards: mechanics of the presumption of conformity and status of the cited standards.
- SAR: specific absorption rate measurement procedures: another family of human-body tests for portable radio products, with a related metrological methodology.
- EN 71: toy safety in the European Union: acoustic thresholds specific to sound-emitting toys, complementary to EN 50332.
- Glossary: definitions of LAeq, acoustic dose, HATS, artificial-ear coupler, NIHL.
See also
Section titled “See also”- HAC: Hearing Aid Compatibility (FCC 20.19, C63.19)
- CPSIA and ASTM F963: toy safety in the United States
- EASA C0 to C6: UAS drone classes and ID labelling
- ISO 10218 and ISO/TS 15066: robotics and cobot safety
- Solar PV modules: IEC 61730 safety and IEC 61215 performance
Sources & references
- EN 50332-1:2013, sound and video equipment, personal music players, part 1 (player + headphone set) , CENELEC www.cenelec.eu/
- EN 50332-2:2013, sound and video equipment, personal music players, part 2 (player and headphone sold separately) , CENELEC www.cenelec.eu/
- EN 50332-3:2017, sound and video equipment, personal music players, part 3 (acoustic dose management) , CENELEC www.cenelec.eu/
- IEC 60318 series, head-and-torso simulators and artificial-ear couplers , IEC www.iec.ch/publications/
- IEC 62368-1, audio, video and information technology equipment, safety requirements , IEC www.iec.ch/publications/
- Mandate M/452 to CEN, CENELEC and ETSI on acoustic safety of personal music players , European Commission ec.europa.eu/growth/tools-databases/mandates/
Frequently asked questions
- What exactly does the EN 50332 series cover and which products are in scope?
- The EN 50332 series sets measurement methods and sound-pressure-level limits for personal music players and portable music players, their associated headphones and earphones, as well as mobile phones and other terminal equipment with audio output intended for personal listening. Three parts are published: EN 50332-1:2013 when the manufacturer supplies the player and the headphone together, EN 50332-2:2013 when the player and the headphone are placed on the market separately, and EN 50332-3:2017 which introduces acoustic dose management over the duration of use.
- Where does the European mandate on personal music player sound levels come from?
- The European Commission referred the matter to SCENIHR in 2007 and then issued mandate M/452 in 2009 to CEN, CENELEC and ETSI to develop measurement methods and limits aimed at preventing hearing disorders linked to personal music player use. SCENIHR opinions identified a significant risk of noise-induced hearing loss (NIHL) among regular users at high levels. EN 50332 in its three parts is the normative response to that mandate, cited by IEC 62368-1 and recognised in the context of product safety.
- What is the difference between EN 50332-1 and EN 50332-2?
- EN 50332-1 applies when the player and the headphone are placed on the market as a single set: the manufacturer controls both components and the combination is measured as a whole on a head-and-torso simulator (HATS) or an artificial-ear coupler. EN 50332-2 applies when the player and the headphone are sold separately: the player is characterised by its maximum output voltage on a standardised load and the headphone by its sensitivity, and the plausible combination is bounded by the associated limits. Both approaches exist in parallel.
- Which sound-pressure limit must be met?
- The most-cited limit is the one in EN 50332-1 and 50332-2: an LAeq of 100 dB(A) for a wide-band-filtered "music" test signal, measured on the artificial-ear coupler or on a HATS, under positioning and spectrum conditions defined by the standard. EN 50332-3 adds a dose logic over the exposure duration: a warning threshold is triggered when the accumulated dose exceeds an equivalent computed from 80 dB(A) over 40 hours per week, and the "high level" mode cannot be maintained without an explicit and logged user action.
- What does EN 50332-3 add that the first two parts do not cover?
- EN 50332-3:2017 introduces the notion of dose accumulator and user counterpart in sound-level management. The device must continuously compute an equivalent dose, display a high-level warning, ask the user to confirm the overshoot, and reset the dose after a defined period. The goal is to prevent a user from remaining for a prolonged time in the risk zone without being aware of it. EN 50332-3 is the most relevant part for recent audio IoT products (true wireless earbuds, connected headphones, portable speakers with head mode).
- Which coupler or phantom is used for the measurement?
- Two devices are admitted. The artificial-ear coupler defined by the IEC 60318 series (IEC 60318-1 for the ear simulator for supra-aural headphones, IEC 60318-4 for the inner-ear coupler for in-ear earphones) is used to measure the level at the drum reference point (DRP) or at the ear-canal entrance point (ERP). The HATS (head-and-torso simulator, IEC 60318-7) is the reference when the placement of the headphone on a realistic head matters (pinna effects, diffraction). EN 50332 admits both with documented correction factors.
- Which test signals are used?
- A "music" signal conventionally defined by EN 50332-1, which is a pink noise filtered to a spectrum matching the average of music samples, is the nominal signal. A 1 kHz sinusoidal signal is used as a calibration reference. For EN 50332-3, additional test signals make it possible to verify dose integration over time. The choice of the "music" signal rather than pure pink noise reflects real use: a personal music player playing music develops a spectrum different from pink noise and the measurement is more representative.
- What is the link with IEC 62368-1 and with workplace noise-exposure rules?
- IEC 62368-1, the general safety standard for audio, video, IT and communication equipment, references EN 50332 in its annex on audio outputs to characterise the acoustic risk on the consumer side. An IEC 62368-1 conformity without EN 50332 verification is incomplete for a product intended for personal listening. Council Recommendation 2003/10/EC and Directive 2003/10/EC frame workplace noise exposure (thresholds at 80 dB(A) and 85 dB(A) over an 8-hour working day); they do not apply to the consumer personal music player but the evaluation scale (A-weighted LAeq over 8 hours) is the same and allows a clinically consistent comparison.