Is it permissible to perform the Athan and Iqamah using loudspeakers inside the mosque, and what is the evidence for this?

It is authentically reported from the Prophet, peace and blessings be upon him, what indicates the desirability of raising the voice with the adhan (call to prayer), because it is more effective in conveying its intended message. A loudspeaker is a means that increases the strength and quality of the muezzin's voice, and these are two desirable qualities in the adhan. Therefore, there is no harm in giving the adhan via a loudspeaker, nor is there any harm in giving the adhan inside the mosque when a loudspeaker is available. The adhan outside the mosque in the early eras was intended to extend and strengthen the voice, and whenever something performs that function inside the mosque, there is no harm in it. The iqamah (call to commence prayer) is similar to the adhan in this regard, as it has been reported that it used to be heard outside the mosque.