Sennheiser HD 280 PRO Monitoring Headphones — Comprehensive Review Introduction The Sennheiser HD 280 PRO are closed-back, circumaural monitoring headphones from Sennheiser, a well-established German audio manufacturer. Marketed primarily at studio professionals, broadcasters, and live sound engineers, the HD 280 PRO aim to deliver durable construction, strong passive isolation and a neutral, reliable sound that…