I ran my SAZ 1500D's at 0.5 daily for a good 6 months with 0 problems... Never got even warm to the touch, and they gave my Soundstream SPLX-12" and a MTX 9500 12" complete hell..
I've got the 3000D's now and I ran them at 0.5ohm a piece daily on 1 Memphis Madd Maxx 15" Quad 1 ohm coils, and for the 2 weeks I did it, it ran awesome. No warmth, no nothing. Performed flawlessly...
Like someone mentioned...no warranty under 1 ohm, but they will do it all day long... as long as you be true and dont go AWOL with your gains and bass boost settings..
They are over-built in every way....and the hew heatseak designs are a very nice mod in my opinion by Jacob...I love my Sundowns...so much I'm going to 18" Sundown Audio Nightshades...//content.invisioncic.com/y282845/emoticons/crazy.gif.c13912c32de98515d3142759a824dae7.gif