A:AnswerWe recommend that you use this product together with the Marshall Bluetooth app for the best user experience, however the speaker also works without the app.
A:AnswerHello Gears, thanks for your question about the Kilburn III. Marshall measures a speaker's loudness by its SPL rating. The Marshall Kilburn III has an SPL rating of 91 dB SPL @ 1m, meaning it can reach a maximum volume of 91 decibels at a distance of one meter.