Inter-M PS-80 - Manual (Page 10)

8 PS-80 (FIXED-INSTALLATION 5" POWERED SPEAKER)
4 4
. HEAT VENT
It’s a section to dissipate the heat generated from
built-in Amp of speaker. It’s located on speaker’s rear
side.
※CAUTION : If this part is blocked, the equipment’s
operation could be unstable, so when it
installed, it has to have enough space.