I have a set of double cans like these with polk speakers. Notice they only have one set of terminals....
Find out if the speakers are wired in parallel or series, and find out the ohm rating for each speaker.
I'm guessing they are 4 ohm, probably wired in parallel, so you will need a 2 channel amp that is 2 ohm stable, and output about 200 watts rms x 2 at 2 ohms.
I ordered a Rockford p500-2 that is rated at 250 x 2 at 2 ohms for mine.