Well the amp does have equaliser settings, but all I could set manually seems to be bass and treble. I set the bass all the way down. They are running in stereo at the moment, as I have not connected the back ones yet, but I might do that soon.
The amp has an aut calibration thing which requires you to plug in a microphone(provided) and it calibrates the speakers. the Manual settings seems slightly lacking, unless I am being stupid and missing them somehow.
so 3,2 ohm is actually incompatible then, as the amp states I should use 6-16?
What I meant was that the sub was made for 3,2 ohm fronts not the 8ohm ones you are currently using so it is calibrated wrong for your setup and that is why it is louder than needs be(your amp is getting a 7.99 ohm load as I said earlier).
Its a bit odd if the amp does not have a custom equalizer mode maybe have a look at the booklet to make sure. If it does not google "potentiometer line level volume control" that should work if you wire a dual pot into the subs inputs.