en_tn_condensed/rev/04/01.md

General Information:

John begins to describe his vision of the throne of God.

After these things

"After I had just seen these things" (Revelation 2:1-3:22)

an open door in heaven

This expression stands for the ability that God gave John to see into heaven, at least by means of a vision. (See: rc://en/ta/man/translate/figs-metaphor)

speaking to me like a trumpet

How the voice was like a trumpet can be stated clearly. Alternate translation: "speaking to me loudly like the sound of a trumpet" (See: rc://en/ta/man/translate/figs-simile)

trumpet

This refers to an instrument for producing music or for calling people to gather together for an announcement or meeting. See how you translated this in Revelation 1:10.