Fajr imam: both audible. Maghrib imam: first two audible, last quiet. Isha imam: first two audible, last two quiet. Zuhr and Asr imams: all quiet. Individual: choice in otherwise audible prayers, with Zuhr and Asr still quiet.
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Consolidated Ruling by Prayer and Role
Rules of Audible and Quiet Recitation in Salah
Fajr imam: both audible. Maghrib imam: first two audible, last quiet. Isha imam: first two audible, last two quiet. Zuhr and Asr imams: all quiet. Individual: choice in otherwise audible prayers, with Zuhr and Asr still quiet.