Marshall launches Stockwell III portable Bluetooth speaker with 40‑hour battery

Marshall announced the Stockwell III, the third generation of its portable Bluetooth speaker line. The new model doubles battery life to around 40 hours of wireless playback and adds an IP55 dust‑and‑water‑resistant rating. It features the brand’s True Stereophonic 360° sound system and a Dynamic Loudness function that automatically balances bass, mids and treble at any volume.

The speaker’s design draws on Marshall’s guitar‑amp heritage, with a leather‑strapped carry band, brass‑topped control panel and replaceable modular components—including the battery, front and rear grilles, silicone sleeve and carrying case—to extend product longevity. A USB‑C port provides a power‑bank function for charging smartphones and other devices. The Stockwell III will be sold on the company’s website and at Costco from early August at a price of $249.99 (≈£200).