PURIFI PTT4.0X04-NAC-03 Woofer

The PURIFI PTT4.0X04-NAC-03 4" Ultra Low Distortion Extended Woofer represents a paradigm shift in compact driver performance, engineered to deliver reference-grade sound quality in space-constrained designs. This 4-inch extended-range driver is the ideal solution for audiophiles and system designers seeking exceptionally clean mid-bass and lower midrange response without compromising on enclosure size. Its primary use cases include high-end two-way monitor speakers, centre channels, and satellite subwoofer systems where precise, articulate low-frequency reproduction is paramount. The driver also excels in multi-way active designs, providing a seamless transition between subwoofer and midrange drivers.

Technically, the PTT4.0X04-NAC-03 features a rigid aluminium cone membrane that minimises break-up modes, ensuring pistonic behaviour across its operating range. The advanced motor system achieves a total Q factor (Qts) of 0.31, combining a low electromagnetic Q (Qes: 0.34) with a controlled mechanical Q (Qms: 3.8) for optimal transient response and damping. With a maximum linear excursion (Xmax) of 6.85 mm and a sensitivity of 83.9 dB SPL at 1m/2.83V, this woofer delivers surprising output and low distortion from a compact 101.6 mm nominal diameter. The 0.38 mH voice coil inductance (Le) and 3.8 Ω DC resistance (Re) further contribute to its clean, controlled performance. This driver is a testament to PURIFI’s commitment to ultra-low distortion and linearity, making it an exceptional choice for discerning audio applications.