I just chatted via eMail/forum with Ron from SVS. I'll be upgrading my PB10-ISD to the 16-46 PC+. The PC-Ultra is only a couple hundred more, but Ed Mullen says it won't go deep with the same authority of the 16-46 PC+, even in 12Hz mode. Plus I'm pushing my budget for this upgrade as is... :BMy room places emphasis on the 50Hz+ frequencies, so I'm not too worried about not having enough peak headroom in that range. If anything I would be worried about that null my room creates between 35Hz and 45Hz. Given the fact that I'm going with a 2" larger driver with over 200W more power I'm not all that concerned...Originally Posted by Ron Stimpson from SVS
We'll see though. As you can see I'm not one to fib about my experiences just because I dumped money into them. If I don't like it, I'll ship that one back too. I would like to note that SVS is going to pick up the return shipping costs on the PB10-ISD, something they don't have to do.