Stk4050 blow ic

[sasek]

Hi all.i'm beginner in amplifier.
My amp base on stk4050 ic.use 56v and 2ohm 12inch subwoofer.And i use sub preamp that boost 35hz.
When i play low bass song at medium volume,my ic blow.
What main issue here?
1.low bass song?
2.low boost frequency preamp?
3.impedance load?
4.power voltage?

And 1 more question.how to i improve my amp from overload?(any protection circuit or shutdown)thanks all

 

[pitbul]

obvious reason is 2 ohm load. This IC is intended for 8 ohm load.
with +/- 56V IC delivers about 170W of power on 8 ohm load.

 

[sasek]

Thanks pitbul.after this i need matching amp and load resistance.now i want go to class d amp for my subwoofer.i build ejtagle ir2110 amp.my opinion this amp very good and efficient.power output cold and transformer warm.i use 2ampre 24 transformer.still can drive my 2ohm infinity subwoofer.
If anybody have other powerfull class d pcb and circuit please share.

Thanks