im so confused Help

This is my amp http://64.4.10.250/cgi-bin/linkrd?_lang=EN&lah=dd3945c7c1c595139a84ea5987ec058b&lat=1090137098&hm___action=http%3a%2f%2fcgi%2eebay%2ecom%2fws%2fe BayISAPI%2edll%3fViewItem%26item%3d5700269879 This is my sub, http://64.4.10.250/cgi-bin/linkrd?_lang=EN&lah=dd3945c7c1c595139a84ea5987ec058b&lat=1090137098&hm___action=http%3a%2f%2fcgi%2eebay%2ecom%2fws%2fe BayISAPI%2edll%3fViewItem%26item%3d5700269879 When i bridge the amp to put out 2000Watts like it ses and i have the gain way down and all that, i turn it up just like they say then raise the gain. It seems fine till i get to a sertin level and the sub freaks out and pushes all the way out and then the amp goes in to safe mode, and then the sub goes back to normal. This has happend a couple of times now. But the weard thing is when i wire the sub in to just one channel its fine i can turn it up pritty loud and nothing happens. wich then i should be putting like 1000 Watts in to the sub. That is ok i guess but i want it to run at its RMS Power at 2000 Watts. Can any one think of what i am doing wrong. the sub is wired in perellel. So im am veary conffused, is it the amp that cant handle it the power wich it ses i can, but then why would the sub go crazy and do that. Please some one help me.

Aren't we handling this question in another thread?

check out the thread 'help'