2ch connected to DVC SUB

I was just wondering is it good to connect subs each voice coil to a channel each under stereo operation? wont it put to much pressur on the sub>?

You're not really supposed to do that because both voice coils have to receive exactly the same signal.  Now if it's a mono signal going in to the amp (like from some head units' sub preamp outputs), then obviously left and right will have identical outputs and you should be able to power each voice coil with its own channel.

And of course the other problem is that you have toget the gains to match up for both channels and that's sometimes kinda hard to do without using a 'scope.

scope?

lol.  an oscilloscope