The best alternatives to Raumfeld One S are AppCoda, Sonos, and BOOM & MEGABOOM. If these 3 options don't work for you, we've listed a few more alternatives below.
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AssemblyAI— Speech-to-Text API with superhuman accuracy
The BOOM & MEGABOOM app by Ultimate Ears has everything you need to get the most out of your Ultimate Ears speaker. From #PartyUp to customizable EQ, unlock even more awesome ways to use your BOOM, MEGABOOM and HYPERBOOM speakers.