I have managed to get to the bottom of the confusion.

Apparently there was an "intermediate" model released in the USA, prior to the MK II.

They removed some of the AMP inputs, and placed orange labeling on some parts.

But this model was ONLY released in the USA, the rest of the world only ever saw the MK1 and the MKII. So that clears that up.

The Bose tech I spoke with also said the price iI paid which included the extra sub was very good as well.

The unit is in very good condition, and the seller said her dad only used it maybe once or twice a month. Some months not at all, so there should be some life in it!!

Now onto sound.

This things sounds brilliant, I do not notice any difference as far as stereo field goes, and the sound is pure at all levels.

Gary, you were 100% spot-on in recommending to check the gain staging, make s a big difference!!.

I've got to say even with just the one sub it kicks pretty good. Although thats just in teh studio, I imagine at a gig I would need the 2..

All I have is the G70 going into one channel on teh L1, and the mic output going to the other,, NO MIXER!!! Yay...and it sounds pure.

On first blush, the BEST bit of audio gear I have bought... Ever!

Big, Big thanks to all those who recommended it and supported my decision to take the plunge.. Good call guys!!!

Dennis