When analyzing raw frequency response measurements of in-ear monitors (IEMs), audio enthusiasts and mixing engineers frequently spot a sharp, prominent spike situated between 7.5 kHz and 8.5 kHz. To an untrained observer, this aggressive peak looks like a severe acoustic defect—a harsh, sibilance-inducing treble resonance deliberately tuned into the earphone driver. In reality, … [Read more...] about Ear Simulator Resonance Peaks: The 8kHz Coupler Artifact Explained
Blog
The 10kHz Pinna Notch: How Outer Ear Folds Create Elevation Cues
When an acoustic wavefront reaches a human listener, the auditory system resolves its spatial coordinates in three-dimensional space through a sophisticated set of biological cues. While horizontal azimuth localization is predominantly governed by Lord Rayleigh's classical Duplex Theory—leveraging Interaural Time Differences (ITD) at low frequencies and Interaural Level … [Read more...] about The 10kHz Pinna Notch: How Outer Ear Folds Create Elevation Cues
Passive Crossover Phase Delay: RC vs. LC Networks in Multi-Driver IEMs
Modern multi-driver in-ear monitors (IEMs) pack remarkable electroacoustic complexity into an enclosure smaller than a fingertip. By combining multiple balanced armatures, dynamic woofers, and electrostatic supertweeters, audio designers can optimize individual transducers for dedicated sub-bands across the audible spectrum. However, dividing the incoming audio signal into … [Read more...] about Passive Crossover Phase Delay: RC vs. LC Networks in Multi-Driver IEMs
Non-Over-Sampling (NOS) DACs: Transient Impulse Response Fidelity
When digital audio reproduction was standardized in the early 1980s under the Philips-Sony Red Book compact disc specification, the engineering foundation relied heavily on the Shannon-Nyquist Whittaker interpolation theorem. In mathematical theory, any band-limited continuous analog signal sampled at a rate fs greater than twice its highest frequency component (fmax < fs / … [Read more...] about Non-Over-Sampling (NOS) DACs: Transient Impulse Response Fidelity
The Legacy of the Sony MDR-CD900ST: Japan’s Broadcast Studio Standard
In the global landscape of professional audio monitoring, few transducers command the near-monolithic reverence of the Sony MDR-CD900ST. While Western recording facilities historically relied on the ubiquitous MDR-7506, Sennheiser HD 280 Pro, or Beyerdynamic DT 770 Pro, virtually every major broadcast station, recording studio, voiceover booth, and mastering suite in Japan has … [Read more...] about The Legacy of the Sony MDR-CD900ST: Japan’s Broadcast Studio Standard