Oliver:
The Theater input does use the crossover settings on the sub, it does not use the volume settings, but is at full gain.
Yes, we have models available for overseas voltage including Singapore. In fact, we've shipped quite a few subs to the East in the last few months.
I don’t know what the shipping cost is, and we actually pay part of it to make it a little easier on our overseas customers. I'll ask someone in our shipping dept. to figure the price and post it here sometime tomorrow.
We don’t publish any SPL specs for our systems. There are two reasons for this: One is that there is a real lack of standards and unless everyone measures using the same protocall, the results can be quite confusing and even misleading. Second, we don’t feel that SPL specs alone are enough to tell how good a sub will sound.
Great questions, please feel free to keep asking. Will try to have that shipping quote posted sometime tomorrow.