What is the ruling on vocal recitation during prayer for congregants (ma'mumeen) that causes disturbance to other worshippers, and do those who hold this view base it on the Almighty’s saying: "And do not recite [your prayer] too loudly or [too softly], but seek a way between that"?

The obligatory minimum for recitation is for the worshipper to hear himself. The Malikis, following Ibn Taymiyyah, hold that the obligation is fulfilled by articulating the letters from their proper points of articulation, even if the worshipper does not hear himself. Raising the voice in recitation to the point of disturbing those nearby is forbidden, as it causes harm. The Prophet (peace and blessings be upon him) said: "All of you are privately conversing with your Lord, so let not some of you raise your voices over others with the Qur'an." Their reliance on the verse "And do not pronounce your prayer too loudly" is out of place, because its reason for revelation was to prevent harm to the polytheists and their reviling of the Qur'an. The Sunnah indicates the permissibility of vocal recitation in some instances and quiet recitation in others.