Writing from the USA. Several years ago there was a fair bit of discussion on using I-phone speakers, especially from I-phones # 4 and 5, as DCC sound speakers. So, in November 2021, we're up to I-phone #13. To those forum members who research such things: have any of the speakers since # 4 & 5 demonstrated improvement, equivalence, size advantage, etc. The older 4 & 5 are getting both more expensive and hard to find.
Thanks
George
North Carolina