GRS 6PT-8 Midbass Woofer

The GRS 6PT-8 is a 6-1/2-inch professional midbass woofer engineered to deliver clear, punchy low-frequency response with exceptional reliability. Featuring a paper cone reinforced with glass fibre, this driver offers enhanced rigidity and reduced cone breakup, ensuring articulate and controlled bass reproduction across a wide range of applications. Whether you are designing high-quality loudspeaker systems, upgrading existing cabinets, or building custom sound reinforcement enclosures, this woofer provides the performance and durability demanded by professional audio projects.

Technically, the 6PT-8 is built around an 8-ohm voice coil with a DC resistance of 7.4 ohms, making it suitable for multi-driver configurations. It achieves a sensitivity of 92 dB SPL (1m/2.83V) and a total Q factor (Qts) of 0.72, balancing efficiency with controlled damping. The mechanical (Qms) and electrical (Qes) Q values are 4.74 and 0.85 respectively, while the maximum linear excursion (Xmax) reaches 4.2 mm. The voice coil inductance (Le) is 1.1 mH, and the copper wire winding contributes to reliable thermal performance. With a nominal diameter of 165.1 mm, a mounting cut-out of 147.3 mm, and a depth of 76.2 mm, this woofer fits standard 6-1/2-inch openings. Four mounting holes on a 6.14-inch bolt circle simplify installation. Ideal for sealed or ported enclosures, the GRS 6PT-8 delivers the midbass impact and clarity essential for professional audio builds.