I have seen some other Forest river brands with the inside area of the cabinet door open, with black nylon (speaker) mesh. However, my feelings are this; It IS called a sub woofer, and therefore is a very low base sound.
Mine sounds good on everything except DVD's. You can adjust the base volume via the remote to make more sound, and just speaking from my son's experience on this subject, you can place a single sub almost anywhere in a vehicle with very good results. Therefore, cutting out the opening should not make a whole lot of difference. I kinda prefer the "stealth" look! It makes the cheap surround speakers sound better than they really are. Randy
/SIGPIC]'08 V-lite Flagstaff 30WRLS
'06 Ram 1500 QC hemi
Reese dual cam sway control,
K&N series 77 intake, Hellwig helper spgs. LT tires,
Flowmaster "true duals", 380 h.p., Bilstein shocks