Po east hing thanks for answering. m&k 350L don't see in the market at all. I would like to hear what you think? If my AV living room is about 32ft (L) x 14ft (w) , in general how many m&k 5310 needed to have a good coverage. I understand depends where I place the sub and if the whole living room being use. But I don't know where to place and I plan to use the whole living room. Hope to hear more idea. Thanks all.