geography - Was the noise from the Temple really that loud?

Mishnah Tamid 3:8 lists a bunch of things in the Temple that could be heard all the way in Yericho.

Some of the things: the gate opening, the Levi'im singing, the Kohein Gadol on Yom Kippur, smelling the k'toret.

Now, could these really reach all the way from Yerushalayim to Yericho? Were they just really loud, was it a miracle, or perhaps the Mishnah is exaggerating.

The distance is apparently around 15 miles (25 km).