One of the loudest Bluetooth speakers I've tested is not made by Sonos or Bose
Briefly

The Fender x Teufel Rockstar Cross Bluetooth speaker redefines mid-priced audio with massive sound, great highs and lows, suiting users who 'love it loud,' although the immersive option may not appeal to everyone.
With its striking design, reminiscent of guitar amps, the Rockstar Cross delivers powerful sound, evoking feelings of nostalgia and energy reminiscent of concert experiences, making it a standout in its category.
In an oversaturated Bluetooth speaker market, the Rockstar Cross proves that not all midrange products are created equal, offering listeners a quality audio experience that challenges expectations.
The collaboration between Fender and Teufel results in an impressive speaker that not only looks good but also plays remarkably well, providing a 'wow' factor that is rare for devices in this price range.
Read at ZDNET
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