{"product_id":"3m-peltor-x4a-over-the-head-earmuffs-nrr-27","title":"3M PELTOR X4A Over-the-Head Earmuffs NRR 27","description":"\u003cp\u003eThe \u003cstrong\u003e3M PELTOR X4A Over-the-Head Earmuffs\u003c\/strong\u003e provide NRR 27 passive hearing protection with an over-the-head headband in the X-Series low-profile cup design — delivering NRR 27 attenuation at the same protection level as the Optime 101 H7A but through the X-Series' contoured, reduced-projection cup architecture for workers in louder industrial environments who benefit from the X-Series' smaller cup footprint at this protection level. The X4A is the over-the-head model in the PELTOR X4 line — providing NRR 27 through the X-Series low-profile cup that distinguishes the X-Series product family from the conventional cylindrical cup design of the Optime series at equivalent NRR levels. NRR 27 provides OSHA-calculated attenuation of (27-7)\/2 = 10 dB for A-weighted noise environments — appropriate for louder industrial noise exposures in the range where NRR 24 and below are insufficient for OSHA PEL compliance and where environments up to approximately 100-104 dBA require the full 10 dB calculated attenuation that NRR 27 provides. The X-Series cup design achieves NRR 27 through the same acoustic principles as the Optime 101 — adequate cup volume, appropriate foam density, and sufficient shell mass for frequency-specific attenuation — but in a cup geometry that reduces the profile that projects from the side of the head. This reduced projection addresses the practical challenge of conventional high-NRR cup earmuffs in close-quarters environments: larger cups needed for higher NRR ratings project further from the head, increasing contact probability with equipment surfaces in tight industrial spaces. The X4A's combination of NRR 27 attenuation with low-profile cup construction is relevant for environments where both high noise and close equipment clearances coexist — louder industrial operations in facilities where machine spacing, equipment access requirements, or work practices bring workers' heads into proximity with surfaces that conventional large cups contact.\u003c\/p\u003e\n\n\u003ch2\u003e3M PELTOR X4A Over-the-Head Earmuffs NRR 27 — Key Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eNRR 27 passive protection\u003c\/strong\u003e — 10 dB OSHA-calculated attenuation for louder industrial environments\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLow-profile X-Series cup design\u003c\/strong\u003e — reduced projection for close-clearance environments at NRR 27 level\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOver-the-head headband\u003c\/strong\u003e — direct cup-seating force for consistent high-level attenuation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLightweight construction\u003c\/strong\u003e — X-Series cup balances NRR 27 acoustic performance with reduced weight and profile\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePassive design\u003c\/strong\u003e — no batteries, maintenance-free operation\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eAttribute\u003c\/th\u003e\n\u003cth\u003eDetail\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel \/ SKU\u003c\/td\u003e\n\u003ctd\u003eX4A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003e3M PELTOR\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNRR\u003c\/td\u003e\n\u003ctd\u003e27\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeries\u003c\/td\u003e\n\u003ctd\u003eX-Series\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting\u003c\/td\u003e\n\u003ctd\u003eOver-the-head (OTH)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003ePassive cup earmuffs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eX4A Over-the-Head: Low-Profile NRR 27 for Louder Industrial Environments with Equipment Proximity\u003c\/h2\u003e\n\u003cp\u003eThe noise environments that require NRR 27 protection — heavy stamping, heavy grinding, pneumatic riveting, large-bore air operations, heavy-duty process machinery — often coexist in the same facilities where workers must also work in close proximity to machines, inside equipment enclosures, or through tight clearance pathways. This combination creates a tension in earmuff specification: the higher NRR required for compliance typically comes from larger cups that project further from the head, increasing the contact frequency with equipment surfaces that breaks acoustic seals in close-clearance environments. The X4A resolves this tension at NRR 27 — delivering the 10 dB OSHA-calculated attenuation needed for louder environments in a cup profile that is more manageable in tight spaces than the conventional Optime 101 cylindrical cup at the same NRR level. Manufacturing facilities with heavy-duty stamping operations and tight machine spacing, industrial processing environments where NRR 27 noise levels coexist with tight overhead and lateral clearances, and maintenance programs where technicians service louder equipment in confined access areas all represent environments where the X4A's NRR 27 in a lower-profile cup has practical compliance advantages over conventional high-NRR earmuffs. The OTH headband configuration provides the headband geometry for maximum cup-seal consistency at this protection level — the over-head band angle that applies seating force directly toward the ear maintains the X4A cup's seal against the head even as the worker moves and repositions in close-clearance environments. For industrial programs that have experienced cup-profile interference issues with Optime 101 in their higher-noise zones, the X4A provides an equivalent NRR 27 option with the X-Series reduced cup footprint.\u003c\/p\u003e\n\n\u003ch2\u003eCompliance and Standards\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eANSI S3.19\u003c\/strong\u003e — NRR 27 tested per standard measurement protocol\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOSHA 29 CFR 1910.95\u003c\/strong\u003e — Occupational noise exposure standard compliance support\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eReal-World Benefits\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eLow-profile cup delivers NRR 27 in a reduced-footprint design that minimizes seal-disrupting equipment contact in close-clearance industrial environments — workers in louder factories, processing plants, and maintenance environments who previously experienced conventional high-NRR cup interference with machine surfaces maintain more consistent protection with the X4A's smaller cup projection, avoiding the compliance gap that seal breaks create.\u003c\/strong\u003e Safety managers in facilities where higher-noise zones also have close machine clearances find the X4A a meaningful upgrade from conventional NRR 27 models when cup-contact complaints are documented in those areas.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eNRR 27 X-Series cup provides the same 10 dB calculated attenuation as Optime 101 in a lighter-weight package — the X-Series cup architecture that achieves lower profile also reduces cup weight compared to conventional high-NRR cylindrical cups, contributing to wearing comfort in louder environments where workers are typically stationary or semi-stationary at specific machine stations for full shifts.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch2\u003eApplications and Use Cases\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeavy manufacturing with close machine clearances — X4A for louder environments with equipment proximity\u003c\/strong\u003e — X4A for manufacturing workers at high-noise machines (stamping presses, riveters, heavy grinders) in facilities with tight machine spacing where conventional NRR 27 cup profiles create equipment contact interference\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLouder industrial processing — NRR 27 low-profile for process equipment and compressor environments\u003c\/strong\u003e — X4A for workers at louder process equipment, large compressors, and industrial blowers in facilities where both the noise level and the equipment proximity favor the X-Series cup design\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUpgrading from Optime 101 in tight-clearance environments — X4A for programs with documented cup-contact complaints\u003c\/strong\u003e — X4A for industrial hearing programs that have identified cup-profile interference as a compliance issue in higher-noise zones and need a direct NRR 27 alternative with reduced cup projection\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eRelated Products\u003c\/h2\u003e\n\u003cp\u003eFor PELTOR X2A NRR 24 OTH X-Series for moderate-high noise, see \u003ca href=\"\/products\/3m-peltor-x2a-over-the-head-earmuffs-nrr-24\"\u003e3M PELTOR X2A Earmuffs\u003c\/a\u003e. For PELTOR X5A NRR 31 OTH X-Series for maximum protection, see \u003ca href=\"\/products\/3m-peltor-x5a-over-the-head-earmuffs-nrr-31\"\u003e3M PELTOR X5A Earmuffs\u003c\/a\u003e. For PELTOR Optime 101 H7A NRR 27 OTH in conventional cup design, see \u003ca href=\"\/products\/3m-peltor-optime-98-h9a-earmuffs-nrr-25-over-the-head\"\u003e3M PELTOR Optime 101 H7A Earmuffs\u003c\/a\u003e. Browse the complete \u003ca href=\"\/collections\/hearing-protection\"\u003eHearing Protection collection\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n\u003ch3\u003eWhat is the difference between X4A (NRR 27) and X5A (NRR 31)?\u003c\/h3\u003e\n\u003cp\u003eBoth are X-Series OTH earmuffs with low-profile cup design. The X4A (NRR 27, 10 dB OSHA attenuation) is appropriate for environments up to approximately 100-104 dBA. The X5A (NRR 31, 12 dB OSHA attenuation) provides the maximum NRR in the X-Series for the loudest industrial environments above 104 dBA. Select based on measured noise exposure: if your noise survey confirms exposures in the range where NRR 27 achieves OSHA PEL compliance, X4A is the right choice and avoids the additional communication isolation of the X5A's 2 dB extra attenuation. If exposures are measured above the NRR 27 coverage capacity, X5A provides the higher protection needed.\u003c\/p\u003e\n\n\u003ch3\u003eIs there an X4 cap-mount model for hard hat programs?\u003c\/h3\u003e\n\u003cp\u003eThe X4 line focuses on OTH configuration; for cap-mount NRR 27 in the X-Series platform, the product landscape may be limited compared to the range available in the Optime series (H7P3E cap-mount). For cap-mount NRR 27 in hard hat programs, the Optime 101 H7P3E is typically the primary specification. The X4A OTH is the primary X-Series offering at NRR 27 for non-hard hat environments where low-profile OTH cup geometry provides the primary value.\u003c\/p\u003e","brand":"3M","offers":[{"title":"Default Title","offer_id":44048699326552,"sku":"X4A","price":34.55,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0594\/1900\/0920\/files\/71ia352vGVL._AC_SL1500.jpg?v=1777428811","url":"https:\/\/wcsafety.com\/products\/3m-peltor-x4a-over-the-head-earmuffs-nrr-27","provider":"WC Safety","version":"1.0","type":"link"}