When the imaam supposed to be reading a silent namaaz but can be heard by the musallis

AS SALAAMU ALAYKUM MUFTI SAHEB,
KINDLY ADVISE WITH REGARDS TO THE FOLLOWING:
WHEN A IMAM PERFORMS A SILENT NAMAAZ IE: ZOHR/ASR AND THE IMAM IS READING SO LOUD THAT THE MUSALLI’S CAN HEAR THE SURAH FAATIHAH AND SURAH, AS WELL AS WHEN HE IS IN RUKU AND SAJDAH YOU CAN HEAR HIM READING THE TASBIHAAT.