It is permissible to pray loud of these Sunnah prayers but is it not recommended. As for “Tahiyatul-Wadhu”, I don’t know what that means.

Can I pray a bit loud in Sunnah of Zuhar and Assar and Tahiyatul-Wadhu?

Prayer | March 26, 2014 7:03 am
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Can I invoke Allah (SubhanHu) with his Names in Salah after Attahiyyat and can I say Ameen in the end?
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It is right to say “Wal-Mumineen” or “Wal-Muslimin” in our Salah, when we invoke Allah? Because every Mumin is a Muslim but every Muslim is not Mumin-so can we pray for every Muslim while they are not good Muslims.