Integrate with transformer technology of compact size.
The volume controller is used to adjust the loudspeaker output in the room.
The volume controller is used to keep the same output level for one same speaker line because the end the speaker line signal loss is rather big, so its outputs is less, thus volume controller is added to the front of the line to lower the speaker output so as to keep the similar ambient output level for the all of the speakers in the same line.
High level white UV-protected ABS material to integrate together with the white wall and architecture design.
Built-in transformer to control the PA 100V line loudspeakers.
Surface wall mount or in-wall mounting box shall be purchased separated.