Note: This product is made-to-order and ships within one week.

Sierra Reference angled baffle headphones

The 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.

Lightweight construction built in-house

The 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.

3D baffle with acoustic lens

The 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.

50mm dynamic driver with paper cone

The 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.

Linear extension system for full-range response

An 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.

Revised headband and improved consistency

The 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.

Comfort tuned for extended listening

The 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.

Amplifier pairing for optimal performance

With 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.

Product highlights

• Open-back over-ear headphone design
  
• 50mm dynamic driver with paper cone diaphragm
  
• Patented Linear Extension System for full-range response
  
• Angled 3D baffle with precision acoustic lens
  
• Lightweight polymer and aluminum construction
  
• 2025 revision with improved headband swivel and enclosure consistency
  
• Dekoni hybrid leather and velour ear pads
  
• Built to order and hand-assembled in California
  
• Recommended use with dedicated amplifier

Specs

• Driver type: 50mm dynamic driver
  
• Impedance: 20 ohm at 1kHz
  
• Frequency range: 20Hz–20kHz
  
• Weight: 0.75 lb (340g) without cable
  
• Materials: nylon, aluminum, PETG
  
• Cable: 1.4 meter (4.6 ft) 3.5mm to 3.5mm cable
  
• Recommended amplifier power: 280mW @ 32 ohm with <1 ohm output impedance

What’s included

• Padded carry case
  
• 1.4 meter (4.6 ft) cable with 3.5mm or 4.4mm termination to dual 3.5mm
  
• Dekoni Elite hybrid leather and velour ear pads (installed)
  
• Stereo wired headphones