This Quran verse tells that calling upon Allah with his attributes is good and offering salat in moderate voice is the best.

Say, “Call upon Allah or call upon the Most Merciful. Whichever [name] you call – to Him belong the best names.” And do not recite [too] loudly in your prayer or [too] quietly but seek between that an [intermediate] way.
Quran (Surah Al Israa, 110)
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