I had a 12" Type-R in a sealed box and pounded the **** out of it for 7 years in my 07 Rabbit until the system was stolen. It sounded amazing for one 12 at time. Got the newer (metal looking) Type-R and I blew 2 of them in 3 months with the same setup. From my personal experience, Alpine's sub quality has gone downhill. Though I have not heard any Alpine since 2016. Maybe they have made them better again? The new Type-X does look interesting.