quick wiring question on sub and amp

I have 1 10'' type R alpine sub in a stealth box.
I believe its the 1040 single voice coil(think so)

I have a 2 channel PPI 2100 amp.
The amp is rated at (2x50) 100watts.

Currently i am using only the left channel, nothing is plugged into the right side.

My question is, i assume becuase i a running only one side or one channel on the amp, i am only getting 50 watts out of it. How can i wire it so i am using all 100 watts?
Run them in parallel?
I just dont wanna try something and fry my amp accidentally

You need to find out whether or not your amp can be bridged. If it can be, and your sub has a 4ohm voice coil, you're in business.

To bridge the 2 channels together all you have to do is connect the + of the sub to the + of the Left channel. Then connect the - of the sub to the - of the Right channel. Connect the RCA inputs like you always would. The amplifier will combine the signals internally for a mono output.

Yes its a 1040 single 4ohm voice coil. i will try that. thanks!