SB Acoustics SB21RDC-C000-4 3/4" Ring Tweeter

The SB21RDC-C000-4 Ring Dome Tweeter from SB Acoustics represents a refined approach to high-frequency reproduction, engineered to deliver clarity and extension in a compact form factor. This tweeter is ideally suited for high-fidelity loudspeaker designs, including two-way bookshelf speakers, three-way systems, and custom audio projects where precise treble response is paramount. Its low resonance frequency ensures seamless integration with midrange drivers, making it a versatile choice for both DIY enthusiasts and professional loudspeaker manufacturers seeking a smooth crossover transition.

Technically, this ring dome tweeter features a 20mm diaphragm with an effective diameter of 20.3mm, driven by a voice coil with a DC resistance of 3.1 ohms and an inductance of just 0.04 mH, contributing to its low distortion characteristics. The total Q factor of 1.0, combined with a mechanical Q of 2.54 and an electrical Q of 1.64, indicates a well-damped design that balances transient response and power handling. With a sensitivity of 90 dB SPL at 2.83V/1m and a nominal impedance of 4 ohms, it offers efficient performance. The resonance frequency of 76 Hz is notably low for a tweeter, enabling extended low-end response and flexible crossover design. This ring dome tweeter delivers the refined high-frequency extension and clarity required for accurate sound reproduction in demanding audio applications.