Tectonic Elements TEBM65C20F-8 3-1/2" BMR Full-Range Speaker

The Tectonic Elements TEBM65C20F-8 is a 3.5-inch broadband driver engineered to deliver clear, full-range audio from surprisingly compact enclosures. This versatile speaker excels in applications where space is at a premium yet sound quality cannot be compromised, making it ideal for custom loudspeaker projects, multimedia systems, and high-fidelity installations where a single driver must cover the entire frequency spectrum without the need for a separate tweeter.

At the heart of this driver lies a paper cone membrane, chosen for its natural and uncoloured sound reproduction across the audible range. The carefully balanced motor system yields a total Q factor (Qts) of 0.89, indicating a well-damped response suitable for both sealed and ported cabinet designs. With a sensitivity of 81 dB SPL at 1 metre for 2.83 volts and a maximum linear excursion (Xmax) of 3.5 mm, this driver can produce surprisingly robust output for its size. The DC resistance measures 7.2 ohms, while the voice coil inductance is a low 0.055 mH, contributing to extended high-frequency response. Mechanical and electrical Q factors of 4.9 and 1.09 respectively further refine the driver's behaviour, ensuring controlled bass and smooth midrange.

This broadband subwoofer offers a practical mounting solution with a cut-out diameter of 84 mm and six fixing holes, fitting neatly into a 108 mm overall frame. Its depth of just 56.8 mm allows integration into slim enclosures. Whether you are designing a bespoke bookshelf speaker or a discreet architectural audio solution, the TEBM65C20F-8 delivers natural, full-range sound with the engineering quality expected from Tectonic Elements.