GRS A25-10 Replacement Woofer (Dynaco A25)

The GRS A25-10 is a meticulously engineered 10-inch replacement woofer designed to restore the legendary performance of the Dynaco A25 loudspeaker. As a direct-fit upgrade, this bass, mid-bass, and subwoofer driver allows you to breathe new life into vintage cabinets, preserving their classic character while ensuring reliable, modern operation. Whether you are refurbishing a cherished pair of heirloom speakers or building a custom project around the iconic Dynaco design, this woofer offers an authentic and straightforward solution.

This driver excels in a variety of applications, from high-fidelity stereo systems to home theatre setups where accurate low-frequency reproduction is essential. Its well-damped response makes it ideal for both music and film, delivering tight, controlled bass that integrates seamlessly with midrange drivers. The A25-10 is particularly suited for sealed or ported enclosures that match the original Dynaco specifications, ensuring optimal performance in restoration projects.

Technically, the woofer features a 6-ohm impedance and a total Q factor (Qts) of 0.37, which provides a balanced blend of transient speed and extended low-end response. With a resonance frequency of 30 Hz, an Xmax of 4.5 mm, and a sensitivity of 89.6 dB, it delivers impressive output and clarity. The 38 mm voice coil and 6.6 ohm DC resistance ensure robust power handling, while the 254 mm frame and 115.5 mm mounting depth fit the original cutout precisely. The equivalent volume (Vas) of 91 litres and displacement (Vd) of 155.7 further confirm its suitability for accurate bass reproduction.

In summary, the GRS A25-10 is the ideal choice for anyone seeking to restore the authentic Dynaco A25 sound with a high-quality, drop-in replacement woofer that combines vintage spirit with contemporary engineering.