Since you didn't mention any specs for your subs, I'll assume they all have one 4 ohm coil.
The amp puts out 250 watts RMS x 2 channels at 2 ohms. That means that you can put the two MTX in parallel on one channel and the two Obicon [?!] in parallel on the second channel.
However, 2 x 250W for 4 subs? That's way too low, the subs will take a lot of space and won't put out much power. Tell us the complete models for all subs and we may help more.