well, 2 separate issues. first- getting hot is not always a real bad thing, just unpleasant. i remember the older 1100's were basically the competitor for the 1100d back in 2k, and both were said to get hot as shiz, not sure how well that one holds, but the old ones would get hot enough to burn mildly, at least you didn't want to hold your hand. the directed could stand temperatures hot enough to "cook an egg", and even start to melt the torroid solder connections. so, basically "how hot is too hot" is based on the amp and it's components/protection. i'm sure it would shut down if it was too hot for long periods. now, i'm sure you can get the temps down a bit if you stop dragging the supply voltage down. that alone can raise temps in the components faster than the heat can transfer and dissapate through the heatsink. 4awg is the lowest i would run the 1100 at by itself. add the jl, or any little amp to the same wire, and you are dragging it down too far. keep the 8 installed, or replace if it cooked, and install a 2nd run of 4 along with it. or betyter yet go with 2awg to a distro block, or 2 runs of 4 to a block and split to both amps there.
