Distorted sound from bluetooth speaker
Since replacing my iPhone 5s with a Xs, playing music by bluetooth to a UE Mobile Boombox sounds distorted. It sounds like the bit rate of the files is lower than it really is - there is a "cutting off" of notes that should decay slowly, the low level detail (cymbals etc) is degraded - as if the quality of the sound is being reduced by the bluetooth process in a way it wasn't when I had the old phone.
Does this make any sense at all, or is it just the speaker malfunctioning? I used to enjoy the sound from the speaker, it was impressive for its size, but now it's hard to listen to. Bit worried that buying a new speaker won't solve the problem as it only started happening when I changed phones.
iPhone XS, iOS 12