Dayton Audio ND140-PR 5-1/4" Aluminum Cone Passive Radiator

The Dayton Audio ND140-PR is a 5-1/4" passive radiator designed to elevate your audio system's low-frequency performance without the need for additional amplifier power. By replacing a port in a vented enclosure, this passive radiator delivers deep, articulate bass with reduced distortion and no port noise, making it an ideal choice for compact speaker designs where space is at a premium.

Perfect for use in bookshelf speakers, subwoofer systems, or custom audio projects, the ND140-PR excels in applications where a traditional port would be too long or impractical. It pairs seamlessly with active woofers to extend low-end response, offering a clean, natural sound that enhances music, home theatre, and professional audio setups.

Engineered with a rigid aluminium cone and a durable rubber surround, this passive radiator ensures precise cone control and long-term reliability. The steel basket provides a sturdy foundation, while the 9mm linear excursion (Xmax) allows for substantial air movement. Key parameters include a resonance frequency (Fs) of 44.2 Hz, an equivalent volume (Vas) of 8.4 litres, and a mechanical Q (Qms) of 4.02. The cut-out diameter is 120.6 mm, with four mounting holes for easy installation.

Combining robust construction with thoughtful design, the Dayton Audio ND140-PR is a versatile and efficient solution for enhancing low-end response in any audio system.