Dayton Audio SIG225-4 Bass-midwoofer

The Dayton Audio SIG225-4 Bass-midwoofer is a meticulously engineered 8-inch driver designed to deliver powerful, accurate bass and midrange reproduction for discerning audio enthusiasts. As a dedicated bass-midbass subwoofer, it excels in custom speaker designs where controlled, low-distortion performance is paramount. Whether you are building a high-fidelity two-way bookshelf speaker, a dedicated centre channel, or a multi-driver floorstanding system, this woofer provides the foundation for a rich, immersive listening experience.

At the heart of the SIG225-4 lies a rigid aluminium cone, chosen for its excellent stiffness-to-weight ratio, which ensures clean, articulate sound across its operating range. With a generous 6mm linear excursion (Xmax), the driver can move significant air volume, producing deep, impactful bass without sacrificing control. The technical specifications reveal a well-optimised design: a total Q factor (Qts) of 0.43, combining a low electrical Q (Qes: 0.45) with a high mechanical Q (Qms: 8.87), indicating a driver suited for both sealed and vented enclosures. A sensitivity of 91.24 dB (1m/2.83V) ensures efficient power handling, while the low voice coil inductance (Le: 0.29 mH) contributes to extended high-frequency response and reduced distortion. The 3.89-ohm DC resistance (Re) and copper voice coil wire further enhance thermal stability and reliability. With a nominal diameter of 203.2 mm and a mounting depth of 101.6 mm, this woofer integrates seamlessly into a variety of cabinet designs, offering a compelling blend of performance and value for the serious DIY builder.