Salat must be recited in a moderate tone

The following verse informs us that the Salat consists of something that should be recited in a moderate tone.

[17:110] Say, “Call Him GOD, or call Him Most Gracious; whichever name you use, to Him belongs the best names.” You shall not utter your Contact Prayers (Salat) too loudly, nor secretly; use a moderate tone.

قُلِ ادْعُوا اللَّهَ أَوِ ادْعُوا الرَّحْمَٰنَ أَيًّا مَا تَدْعُوا فَلَهُ الْأَسْمَاءُ الْحُسْنَىٰ وَلَا تَجْهَرْ بِصَلَاتِكَ وَلَا تُخَافِتْ بِهَا وَابْتَغِ بَيْنَ ذَٰلِكَ سَبِيلًا