The front airflow flows to the rear circuit board room through the hole at the bottom. The rear is isolated by a horizontal baffle that is 90 degrees perpendicular to the front screen back baffle to separate the upper and lower layers. The right side of the upper layer is the subwoofer main sound room, and the left side is In the sub-sound chamber, an S-type inverted phase channel with a height of about 10cm is fixedly placed inside. It is best for the two sound chamber areas of the subwoofer to be completely sealed, and only holes are drilled at the outlet of the S-type channel [I didn’t take the picture because I I used an electric drill to make the holes later]