alpine sub with rodek amp?

Hello everybody

Here is the story.

I went out and bought and Alpine Type R sub (10 inch, DVC 2ohm) and a sealed box. I hooked it up to a Rodek amp (RA 250E) which is an older amp, 2 channel.

Any who, after I hooked everything up, I went to test the system and the amp stays in "protection" mode and the sub won't play at all.

I have no idea why it is doing this,

This is what I did:

The sub has 4 terminals: I jumped the 2 middle terminals and ran speaker wire from the outer terminals to the amp. I am not sure if this is the proper way to do this. The sub came with 2 jumpers. Should I jump all 4 terminals? Or not use a jumper at all?

Is the amp too old? How can I find out if it's bridgeable?

Should I just go with a newer amp?

How can I make this work!!!!!!!!!!!!

Help is much appreciated!