I am seriously looking into getting one but was worried that I'll hit the same short fuse and amp design problem you encountered... did they change the whole amp unit
Like papaber my Pro Sub 80 also suffered from the fuse problem.
According to Definitive's local distro then, circa 2002 Audio Den, they had a new amp section delivered from the manufacturer and replaced mine with it. This was because part of the amp got fried. It worked for some time.
2003, the fuse blew again and the sub refused to work despite a new fuse.
I had it brought to Studio Systems in J.Bocobo Manila and had them work on it.
They returned it saying they couldn't find anything wrong with it.
I asked them to use it for two weeks or so to burn it in. Now it's still working.
I don't know what's wrong with these units but they don't seem to like our local power supply ~ even through a 2500W AVR. Maybe I need a Line conditioner?
I'm looking to acquire either ProCinema 200 or Studio Monitor 350 at the sale if they are included.