I've had the opposite experience with the S9+. On my previous S8+, the speaker phone sounded mostly adequate but never quite loud enough. It wasn't until using it directly next to my partner's LGV20 which has outstanding volume and clarity that I realize how mediocre the speaker phones on the S8+ really were. The S9+ speaker phones have been noticeably louder and clearer than the S8+ and I've not had a muddled call yet. In fact, using the external speakers for calls and for all my media use has been pretty awesome, especially in direct comparison with my previous three Samsung devices. I think the S9+ sounds distinctly better in all circumstances than my S6 edge, S7 edge and S8+.