I also had a huge crush on Response 4 which is like a Refrigerator size(I remember as around 65" tall???& 250 pounder each) at my friend's back to a couple of years ago. I still don't forget the sound which I regard it as the best(to my ears) so far. He said $18000... I haven't seen 5 yet but it's smaller than 4 a lot but slightly bigger than 3.8. probably around 50"tall? Hope this helpful & happy listening!