Mike,
Thanks for your input. Back when I first got the puppy's I had one spacer not two in and it was too boomy. However since then I have put absorption panels on the ceiling as well as wall behind speakers in addition to thick floor rugs. So now I began to wonder if I should try going back to one spacer. I think it will still be too boomy but just was curious as to whether most people end up happier with none, one, or two. You are very right its room and equipment sensitive.
Michael
p.s. I am too chicken to change the spacers on the puppy's with the wife and was hoping people would say don't bother. The store installed the speakers and adjusted the spacers originally