{"product_id":"dayton-audio-3-5-nd91-4-full-range-neodymium-driver","title":"Dayton Audio 3.5\" ND91-4 Full-Range Neodymium Driver","description":"\u003cstrong\u003eThe Dayton Audio ND91-4 is a 3-1\/2\" full-range neodymium driver built for compact speakers, delivering wide-band response and high excursion from a small chassis.\u003c\/strong\u003e\n\n\u003cp\u003eDesigned for engineers and DIY audio enthusiasts who need a true point-source driver in tight enclosures, the ND91-4 blends a rigid aluminum cone with a neodymium motor to reproduce from deep bass fundamentals up through detailed high frequencies. Its low distortion behavior and unusually large linear excursion for a 3.5\" driver make it well suited for miniature monitors, surrounds, compact line arrays, and sealed or passive-radiator systems.\u003c\/p\u003e\n\n\u003ch3\u003eHow does this driver perform across the frequency range?\u003c\/h3\u003e\n\u003cp\u003eThe ND91-4 provides broad full-range output that reaches well into high frequencies while retaining usable low-end extension for its size. Expect clear mids and highs with a low resonance allowing smoother integration in small sealed or passive-radiator boxes.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eNominal full-range response roughly 65 Hz to 17 kHz\u003c\/li\u003e\n  \u003cli\u003eAluminum alloy cone for controlled high-frequency dispersion\u003c\/li\u003e\n  \u003cli\u003eSelf-shielded motor minimizes magnetic interference in compact layouts\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat allows this small driver to handle significant excursion?\u003c\/h3\u003e\n\u003cp\u003eThis driver uses a large, long-travel motor and a robust voice coil assembly to achieve impressive linear stroke for its diameter. The underhung voice coil geometry combined with a compliant rubber surround keeps distortion low even near the excursion limits.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e4.6 mm linear Xmax, 25 mm peak mechanical excursion capability\u003c\/li\u003e\n  \u003cli\u003e1\" four-layer underhung voice coil on a polyimide former for heat resistance\u003c\/li\u003e\n  \u003cli\u003eRubber-edged surround for reliable cone excursion and damping\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow does the motor and build reduce distortion and improve control?\u003c\/h3\u003e\n\u003cp\u003eThe ND91-4 uses a neo-balanced magnet system with a copper-alloy shorting ring that reduces nonlinearities and improves transient response. The result is cleaner sound with less intermodulation at higher drive levels compared with simple ferrite designs.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eNeodymium magnet structure for compact, high-flux motor strength\u003c\/li\u003e\n  \u003cli\u003eCopper-alloy shorting ring lowers electromagnetic distortion\u003c\/li\u003e\n  \u003cli\u003eSelf-shielded assembly for versatile placement near electronics\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat enclosure types and configurations work best?\u003c\/h3\u003e\n\u003cp\u003eBecause of its low-frequency reach and high excursion, the ND91-4 pairs well with small sealed cabinets or with matched passive radiators to extend bass without increasing box size. It also performs reliably in multi-driver arrays and compact nearfield monitors where the point-source characteristic is desired.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eSmall sealed monitors and bookshelf speakers\u003c\/li\u003e\n  \u003cli\u003eSurround channels and compact line-array designs\u003c\/li\u003e\n  \u003cli\u003eSealed boxes augmented by ND-series passive radiators for richer bass\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: The Dayton Audio ND91-4 suits hobbyists, speaker designers, and installers who need a compact full-range driver with exceptional excursion and low distortion. If you’re building miniature reference monitors, discreet surround speakers, or tight line-array modules and want controlled bass plus clear highs from a single small driver, this model is a practical, high-performance choice.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: What impedance is the ND91-4?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: The ND91-4 is a 4 ohm full-range driver, suitable for low-impedance speaker designs.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can I use it in a passive-radiator enclosure?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes — it pairs well with Dayton ND-series passive radiators to extend bass from small boxes.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Dayton Audio","offers":[{"title":"Default Title","offer_id":48413420978333,"sku":"B005FMXUZ0","price":53.55,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0766\/9596\/1757\/files\/dayton-audio-nd91-4-front-view.jpg?v=1781264702","url":"https:\/\/nexoltic.com\/products\/dayton-audio-3-5-nd91-4-full-range-neodymium-driver","provider":"Nexoltic","version":"1.0","type":"link"}