BEHRINGER EPQ900 BOOM!

I have a behringer EPQ 900 ( I grabbed it cheap and thought it would be pretty good, but is complete utter shite). 

So I tested the amp on test volume with 1 channel powering a passive crossover going into a 12" RCF and 1" BMS. 1sec sound came out, very quiet. Next thing I hear something like 'sssshhhh' , then I smell something burned. Ok , thank you Behringer! I opened up the case, saw a fried resistor with 2x green and 2x gold rings. So that would be a 5.5 Ohms 5% resistor if I am right? Also, the behringer still turns on and makes some 'krak krak krak' sounds when you plug it into a 15" driver.I tried a QSC EX amp with exact same cabling and drivers and crossover, worked perfectly. I am a 20 year old guy and have been doing PA and DJ's sound for a few years. For my other hobby I fix broken Macbooks etc. I sometimes work as an electrian, but I want to go to component level and know everything about restistors,transistors,mosfet,capacitor et cetera, some have a good read URL for me please?

So now my questions,

1) Why did this happen?

2) If I replace the resistor with exacte same one , will it work?

3) Does some one have schematics for this amp or am I wishing too much now?

Thanks in advance 

Good thing I got it for 75€. I'm just going to buy a QSC MX1500 instead of this behringer shite.
I was always a fan of behringer because their stuff was cheap and basic and just worked but now hmm.