1) I am using one subwoofer connected to the Analog out. Do i need to use a Y adapter or is there some intelligence in the unit to sent all LFE data if it detects only one Analog connected?
Is what you're saying that unlike many subwoofers that have stereo L/R line inputs, your particular subwoofer has only a single mono LFE input? In which case using only the L or R analog output of the amplifier would only give you partial bass information from one channel.
If so, I guess your question still stands - is it OK to use a Y-adapter to combine the outputs into a mono signal (as I wouldn't expect the amplifier to "sense" that only one channel is connected and automatically output a mixed mono signal to either channel's output, which I believe was your other related question)?
Steve