Ivor,Perhaps since you are so knowledgeable about this subject you would share what the essential elements in a line array designed for the interior of a dwelling are. You know: numero 1, numero 2, numero 3, etc.
Then we could all be enlightened, and we would have assurance that you really want to discuss and are not just looking for a way to start a flame war. Right now your virulent ire toward someone who didn't describe something in the way you would like is way out of proportion to normal internet conversation.
Kind regards,
Marlboro