Does anyone ever set their PB2+ above 50% gain? I have a 4800 cu ft room and have been going back and forth whether I need the PB2+ or its little brother, the PB2-ISD. From what I have read, including several posts from SVS to me and on various forums, I make the following conclusions: 1. A two driver sub will almost always out perform single driver subs, even if the two drivers used are not as good as the single (PB2-ISD two drivers will outperform single driver plus series). 2. Unless pushing the sub to it's limits, the differences between a PB2-ISD and a PB2+ is not noticeable except that the PB+2 is a bit louder before it reaches it's limit. 3. Most people (with medium size rooms around 4800 cu ft, like me)who get the PB2+ never come close to pushing it to it's limits and in fact would not likely push a PB2-ISD close to its limits either unless trying to scare their friends and neighbors. 4. The PB2-ISD (in a medium size room)is the much better deal since the PB2+ is overkill except when trying to do structural damage to your house and neighbor's ears during demonstrations. 5. It is much more fun to say you have the PB2+ (even though it is much more power than you need). The PB2+, which has been reviewed as an excellent sub and is much more talked about than the PB2-ISD, which almost no one talks about, may be worth the extra $300 to some for this reason alone. 6. Sub owners have never watched Nemo all the way through but know exactly where the glass tapping scene is. Don't get me wrong and please don't flame me since I am a bit of a newbie regarding subs. I am sure that many of you with average incomes are thinking the same thing or had to cross this bridge before placing your order. I keep trying to justify the PB2+ by telling myself, why take a chance, spend the extra money and get the last sub you will ever need. But then again, five years from now, who knows what will be available and why spend $300 more for something I will never need since I doubt my theater will ever get bigger. Now to some $300 isn't that much to worry about. Its really not the $300 but the fact that once the price goes past $1,000 for a sub is when I really wonder if I am buying a better sound for movies or just getting caught up in the crowds. I have been careful to get the most bang for my buck when building my theater and try to never pay more for a name brand or sound qualities that I likely will not be able to notice. Decisions, decisions... Are my conclusions incorrect? What do you think?