Prayer: For the tarakhkhuṣ limit, is it enough to see the city’s walls or hear the adhān — or are both required?

Practical Laws of Islam as per the teachings of Imam Khamenei

Prayer: For the tarakhkhuṣ limit, is it enough to see the city’s walls or hear the adhān — or are both required?

English:

Question #674:

The criterion of the tarakhkhuṣ limit is the visibility of the city’s walls and audibility of its adhān. Are both of them together necessary or one is sufficient?

Answer #674:

The tarakhkhuṣ limit is a place in which you cannot hear the normal adhān of the city said without a loudspeaker.

-Imam Khamenei, Practical Laws of Islam, Importance and Conditions of Prayer