Need fast answer help

yea cl I scooped it for 300.00 it was hooked up and pushing a couple tens forget what brand from what I see it was repaired in 04 but I opened it up just now and I see where the problem was one fet and it looks like thats all judging by the sticker it was factory repaired and since it was in 04 and it's been going this long everything would be good I tried to talk him down he wanted 350 and would not budge lower then three he somewhat knew his sh*t but for 300 and being it was this or a t1500.1bdcp for 450 off fleabay my 600.2 can't take summer heat and a 2ohm bridged load!

 
I turned the qfc to the lowest setting what ever it is it affects output so with it at the lowest value I set the gain from there(set for 1800rms) and **** this thing puts out and looks to be pulling less current then my T600.2 @ 2ohms, gotta say not not loving it!

 
Ok I found this reading it all I take from it is it simply adjust the curve between the subsonic filter and the low pass what do you guys think?

Q-Factor Control of Lowpass Filter: QFC allows a control of the lowpass filter slope; basically turning the QFC potentiometer will change the damping quality. Depending on the individual requirements, it is possible to give the subwoofer a "slimmer" or a "fatter" sound. [the setting is from 0.5 to 1.2]

 
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