2 channel home theatre....sub

i just bought a very nice sub, anyway it looks nice, for what i thought was going to be a 2.1 home theatre jubilee...
Mc 402 amp
mark levinson 320s pre
modded denon 2910 dvd
piega c10 ltds- 2 channel front

i'm claiming ignorance for this one, but can't a guy run the sub out from the dvd player...do i have to buy a processor just so i can have a sub? i don't want to run line level through the main speakers- they're doin fine... i just wanted the sub for the theatre.

i'm a little disgruntled and sure would like some advice.... thanks, brent