Dayton Audio ND90-PR 3-1/2" Aluminum Cone Passive Radiator

The Dayton Audio ND90-PR 3-1/2" Aluminium Cone Passive Radiator is a meticulously engineered component designed to elevate the low-frequency performance of your audio system. As a passive emitter, it works in perfect harmony with an active driver within a sealed enclosure, effectively extending bass response without the need for additional amplifier power or a port. This makes it an ideal solution for compact speaker designs where space is at a premium, such as in bookshelf speakers, portable Bluetooth systems, or custom car audio installations. By replacing a traditional bass reflex port, it eliminates unwanted chuffing and resonance, delivering cleaner, more articulate low-end reproduction.

Technically, the ND90-PR features a rigid aluminium cone paired with a durable rubber surround, ensuring both longevity and precise cone control. Its steel basket provides a stable foundation, while the mechanical compliance and suspension parameters have been carefully tuned for optimal performance. With a resonance frequency of 53.8 Hz and a linear excursion (Xmax) of 9 mm, this passive radiator can move significant air volume, producing deep, impactful bass. The Qms of 6.15 and Rms of 0.44 indicate well-damped mechanical behaviour, contributing to accurate transient response. The unit requires a cut-out diameter of 85.1 mm and is secured via four mounting holes, making integration straightforward. Whether you are upgrading an existing design or building from scratch, the Dayton Audio ND90-PR offers a reliable and high-performance solution for achieving rich, room-filling low frequencies.