If the sub is in a sealed enclosure it will only be able to compress the air in the box so far.If it has a lot of back pressure and you try to force it to run louder (more excursion than the box will allow) or there is not enough air to circulate through the subs cooling ports/vents the voice coils will burn.That would have to be an extremely small box and your box looks big enough in the pics.Check the settings on the amp.Don't take the gain past 2/3 or the x-over past 120Hz and make sure the low pass filter is switched on. Also if there is a subsonic filter switch it on also. Make sure the sub is a dual 4 + 4 ohm sub with the coils wired in parallel. If it is a 2 + 2 in parallel then I'd be surprised your car hasn't burnt to the ground yet.By the look of the install the guys who did it know what they are doing so it may just be a dud amp. A faulty transistor or power supply in the amp is all it takes to send DC through the coil and burn it. Although the clarion amps are rated at decent power I would be more inclined to use an Alpine MRD-M450.
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