{"product_id":"auribus-acoustics-sierra-reference-open-back-headphones","title":"Auribus Acoustics Sierra Reference Open Back Headphones","description":"\u003cp\u003e\u003cem\u003eNote: This product is made-to-order and ships within one week.\u003c\/em\u003e\u003c\/p\u003e\n\u003ch1\u003e\u003cstrong\u003eSierra Reference angled baffle headphones\u003c\/strong\u003e\u003c\/h1\u003e\n\u003cp\u003eThe Sierra Reference is a ground-up reconceptualization of what an open-back dynamic headphone can deliver. It combines true-to-life accuracy with physical impact and long-wearing comfort. Built around a 50mm dynamic driver, angled 3D baffle, and patented Linear Extension System, it delivers a spacious, detailed presentation with deep, controlled low-end reach. The 2025 revision refines both the mechanics and acoustics, making it a reliable tool for both critical listening and daily use.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eLightweight construction built in-house\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThe full assembly is produced using a combination of advanced polymers and aluminum, resulting in a structure that balances durability with reduced weight. At 0.75 lb (340g), it remains comfortable over long sessions while maintaining structural integrity. Each unit is built to order and assembled in California, allowing for careful quality control and serviceability over time.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003e3D baffle with acoustic lens\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThe internal geometry places the driver at an angle relative to the ear, helping sound arrive more naturally. A precision-cut acoustic lens further shapes how sound disperses, improving spatial accuracy and depth. This design supports layered recordings, making placement and separation easier to follow.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003e50mm dynamic driver with paper cone\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThe Peerless paper cone driver emphasizes natural tone across the spectrum. Paper diaphragms are known for balanced stiffness and damping, which helps avoid harshness while preserving detail. Combined with the open acoustic structure, the result is a presentation that stays coherent from low bass through upper treble.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eLinear extension system for full-range response\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eAn updated version of the patented Linear Extension System (Pat. 12,395,780 B2) manages airflow and damping to maintain consistent output across frequencies. The design supports extension from 20Hz to 20kHz, allowing both low-end weight and high-frequency detail to come through without abrupt roll-off. This is especially noticeable in recordings with wide dynamic range and deep bass content.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eRevised headband and improved consistency\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThe 2025 revision introduces a smoother swivel mechanism in the headband, improving fit across different head shapes. Updates to the driver enclosure also improve mechanical and acoustic consistency between units, helping maintain reliable performance across production runs.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eComfort tuned for extended listening\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThe frame applies minimal clamp force while maintaining stability. At 0.75 lb (340g), the reduced weight makes it easier to wear throughout the day. Dekoni hybrid leather and velour pads distribute pressure evenly while maintaining a consistent seal. The floating headband design spreads load across the top of the head, reducing pressure points.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eAmplifier pairing for optimal performance\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eWith a 20-ohm impedance at 1kHz and moderate power demands, the Sierra Reference benefits from a dedicated amplifier. A unit capable of at least 280mW at 32 ohms with low output impedance helps maintain control over the driver and ensures consistent tonal balance at different listening levels.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eProduct highlights\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eOpen-back over-ear headphone design\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e50mm dynamic driver with paper cone diaphragm\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003ePatented Linear Extension System for full-range response\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eAngled 3D baffle with precision acoustic lens\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eLightweight polymer and aluminum construction\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e2025 revision with improved headband swivel and enclosure consistency\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eDekoni hybrid leather and velour ear pads\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eBuilt to order and hand-assembled in California\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eRecommended use with dedicated amplifier\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eSpecs\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eDriver type: 50mm dynamic driver\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eImpedance: 20 ohm at 1kHz\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eFrequency range: 20Hz–20kHz\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eWeight: 0.75 lb (340g) without cable\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eMaterials: nylon, aluminum, PETG\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eCable: 1.4 meter (4.6 ft) 3.5mm to 3.5mm cable\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eRecommended amplifier power: 280mW @ 32 ohm with \u0026lt;1 ohm output impedance\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eWhat’s included\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003ePadded carry case\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e1.4 meter (4.6 ft) cable with 3.5mm or 4.4mm termination to dual 3.5mm\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eDekoni Elite hybrid leather and velour ear pads (installed)\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eStereo wired headphones\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Auribus Acoustics","offers":[{"title":"Default Title","offer_id":47484254650604,"sku":"APS-1300-1","price":1200.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0225\/2721\/3642\/files\/apos-audio-auribus-acoustics-headphone-auribus-acoustics-sierra-reference-open-back-headphones-1231431862.jpg?v=1775682610","url":"https:\/\/apos.audio\/products\/auribus-acoustics-sierra-reference-open-back-headphones","provider":"Apos","version":"1.0","type":"link"}