I have a pioneer dehp6100 headunit, I have 2 6" and 2 1" infinity component speakers in my doors and an MTX sub in the boot, it all runs off the outputs on the headunit. Thing is I have been told that the MTX sub could blow the sub output on the headunit if I push it too hard, but I have had it upto volume level 40 and this is louder than alot of other stereos I have heard and it doesn't even struggle. Was the shop that sold me the sub just trying to get me to buy an amp aswell or am I tempting fate by not using a separate amp? anybody know?