Dayton Audio SIG120-4 Mid-range Woofer

The Dayton Audio SIG120-4 4” Signature Series Extended Range 4 Ohm driver is a precision-engineered mid-bass subwoofer designed to deliver accurate, low-distortion performance in space-constrained applications. This compact yet powerful unit excels in scenarios where high-quality mid-bass reproduction is essential, such as in small sealed or ported enclosures for home theatre systems, near-field studio monitors, or custom automotive audio installations. Its extended range capabilities also make it an ideal choice for multi-way speaker designs requiring a dedicated mid-bass driver that can seamlessly bridge the gap between a subwoofer and a mid-range unit.

Technically, the SIG120-4 features a rigid aluminium cone and a cast aluminium basket, both of which contribute to exceptional structural integrity and significantly reduced distortion even at higher output levels. The driver’s electrical parameters include a DC resistance (Re) of 3.7 ohms, a total Q factor (Qts) of 0.43, and a sensitivity of 89.7 dB (SPL at 1m/2.83V), ensuring efficient power handling and controlled response. With a maximum linear excursion (Xmax) of 4 mm and a voice coil inductance (Le) of just 0.22 mH, this driver offers precise transient response and low harmonic distortion. The cut-out diameter is 95 mm, with a mounting depth of 59.2 mm, making it suitable for compact enclosures. Whether for upgrading an existing system or building a new design, the SIG120-4 delivers reliable, high-fidelity mid-bass performance.