I've caught the upgrade bug and I'm looking for opinions from PB12 Plus/2 owners that have upgraded. I'd like to know how this older sub compares to the the newer SVS models and I'm open to other brands. Budget is flexible but I'm looking around $3500 for dual subs. Dedicated theater use so all movies. Sorry about the long post but I like to give as much info as possible.
I purchased one of the last PB12 plus/2's from SVS in 2008 and I just can't seem to get it right. At first it was in in an open family room with wood floors and tall ceilings and I figured that limited it's potential. It would rumble the house but wasn't that tight brutal bass I was looking for. It always sounded a bit boomy and I contributed it to room acoustics and placement. I recently completed a dedicated home theater that I thought would really make this thing shine but I'm still left wanting. The sub just falls off below 25 hz and it doesn't seem to matter if I use the 20hz or 16hz tune. It also sounds a bit boomy in the upper bass range around 80 hz. Crossing over at 80-100hz really muddies the sound so I'm currently crossing over at 60hz which sounds the best.
My room is 20' wide x 17' deep x 7' tall. It's sound proofed with double layer 5/8" drywall, Green Glue (3 tubes per sheet), Isolation clips and hangers, communicating doors and mufflered HVAC system. I've put in extensive room treatments but I'll admit I didn't follow science for that one as I made the front of the room as dead as possible and used bass traps and panels throughout but placement was a combination of aesthetics and performance. The panels pictured are all 4" thick mineral wool. The panels behind the screen and flanking the screen are 2" mineral wool.
I use a Denon 4311 and Emotiva XPA-3 amp to power 3 - Emotiva 6.3 LCR and 4 Emotiva ERD-1 surrounds. I've run audyssey following the guide and used a boom mike stand for all 8 positions. Checking the Audyssey equalization gives a fairly flat response on the speaker with nothing needing more then 6 db of adjustment but most are under 3db.
I did the sub crawl and found the best location for the 5 primary seats is directly behind the main listening position. Front Ccorner placement took all bass away from the 3 center seats. You can just make out the plus2 in the 3rd picture directly below the projector.
I'm thinking if I upgrade to two subs flanking each side of the screen I could eliminate some of the room nulls and get that tight bass I'm looking for. When I purchased the Plus2 the I listened to the ultra in the demo room and it was what I was looking for and should have bought it. SVS actually steered me towards the plus/2 for my particular room as it had more output suitable for a open family room. I should have did a back to back test in the room but I blew that one.