{"product_id":"sennheiser-hd-400-pro","title":"Sennheiser HD 400 Pro","description":"\u003ch3\u003eSennheiser HD 400 PRO – Open-Back Studio Reference Headphones\u003c\/h3\u003e\n\u003cp\u003eThe HD 400 PRO offers neutral, transparent sound in a lightweight package, built for serious mixing and monitoring. With angled drivers, velour pads, and interchangeable cables, it delivers clarity, comfort, and flexibility for long studio sessions.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDynamic open-back design:\u003c\/strong\u003e Produces an airy, spacious soundstage for reference listening\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAngled transducers:\u003c\/strong\u003e Optimise stereo imaging and reduce distortion at high sound pressure levels\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e120 Ω impedance:\u003c\/strong\u003e Designed for professional sources, with headroom for detailed listening\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFrequency response 6 Hz – 38 kHz:\u003c\/strong\u003e Covers extended bandwidth for both low-end and subtle high frequencies\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVelour earpads \u0026amp; lightweight build:\u003c\/strong\u003e Offers all-day comfort with minimal fatigue (≈ 240 g without cable)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInterchangeable cables included:\u003c\/strong\u003e 3 m coiled and 1.8 m straight cables, plus 6.3 mm adapter\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCustomer Benefits\u003c\/h4\u003e\n\u003cp\u003eHD 400 PRO gives you a clear, uncolored sonic canvas ideal for critical listening, mixing, and mastering. The angled drivers and open acoustic design offer a realistic spatial presentation. Its comfort and light weight make it usable for extended sessions, and by including both coiled and straight cables, it adapts to different studio setups effortlessly.\u003c\/p\u003e\n\u003ch4\u003eQuick Specs\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAcoustic principle:\u003c\/strong\u003e Dynamic, open-back\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEar coupling:\u003c\/strong\u003e Circumaural (over-ear)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImpedance:\u003c\/strong\u003e 120 Ω\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFrequency response:\u003c\/strong\u003e 6 Hz – 38 kHz (−10 dB)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSound pressure level (SPL):\u003c\/strong\u003e 110 dB (1 kHz \/ 1 V RMS)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTotal harmonic distortion (THD):\u003c\/strong\u003e \u0026lt; 0.05 % (1 kHz \/ 90 dB SPL)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight (without cable):\u003c\/strong\u003e 240 g\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncluded cables:\u003c\/strong\u003e 3 m coiled + 1.8 m straight (3.5 mm), plus 6.3 mm adapter\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eWhat’s in the Box\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eSennheiser HD 400 PRO headphones\u003c\/li\u003e\n\u003cli\u003e3 m coiled cable (3.5 mm twist-lock)\u003c\/li\u003e\n\u003cli\u003e1.8 m straight cable (3.5 mm twist-lock)\u003c\/li\u003e\n\u003cli\u003e6.3 mm adapter\u003c\/li\u003e\n\u003cli\u003eQuick start \u0026amp; safety guides\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eUse Cases \/ Ideal For\u003c\/h4\u003e\n\u003cp\u003eDesigned for producers, engineers, and audiophiles who need reliable reference headphones. Excellent for mixing, editing, mastering, and general studio monitoring where open-back accuracy matters.\u003c\/p\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eBest suited for interfaces, DACs, and headphone amps that can comfortably drive 120 Ω loads. The included cables and adapter allow connection to a wide range of studio gear.\u003c\/p\u003e\n\u003ch4\u003ePros \u0026amp; Cons\u003c\/h4\u003e\n\u003cp\u003e\u003cstrong\u003e✅ Pros:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eAccurate, balanced sound suitable for critical listening\u003c\/li\u003e\n\u003cli\u003eWide soundstage and natural spatial cues\u003c\/li\u003e\n\u003cli\u003eComfortable design with velour pads and light weight\u003c\/li\u003e\n\u003cli\u003eInterchangeable cables provide flexibility\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e⚠️ Cons:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eOpen-back design leaks sound and offers minimal isolation\u003c\/li\u003e\n\u003cli\u003eRequires quality amplification for full low-frequency control\u003c\/li\u003e\n\u003cli\u003eNo carrying case included\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe Sennheiser HD 400 PRO strikes a fine balance between accuracy, comfort, and usability. It’s a smart choice for anyone seeking dependable reference headphones for studio and creative work.\u003c\/p\u003e","brand":"Sennheiser","offers":[{"title":"Default Title","offer_id":54242377072908,"sku":"HD400PRO","price":249.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0711\/7416\/0652\/files\/sennheiser-hd-400-pro-hero.jpg?v=1778064194","url":"https:\/\/soundium.com\/bg\/products\/sennheiser-hd-400-pro","provider":"Soundium","version":"1.0","type":"link"}