JUZEAR proudly presents the Harrier, the world’s first IEM “tuned with Squiglink,” a data-driven tuning approach created with audio reviewer Mark Ryan Sallee (Super* Review). Squiglink, a global hub for headphone and IEM frequency-response measurements with thousands of datasets and over 50,000 monthly users, provides the objective foundation behind this collaboration. Through the “Tuned with Squiglink” program, Mark draws on eight years of experience reviewing and measuring more than 500 IEMs, combining prototype measurements, critical listening, and parametric EQ refinement to help manufacturers avoid common tuning pitfalls and achieve the best sound for their target audience. For the Harrier, the goal was simple: deliver a balanced tuning that would appeal to a wide audience. Squiglink analytics revealed strong listener preference for IEF Neutral + Bass Boost, guiding the direction of Harrier’s development. After multiple iterations informed by measurements and expert feedback, the result is an IEM with a precise, natural, and balanced signature—an audio experience shaped equally by science, experience, and passion.