Hi, I'm from the UK and I've had my sub for over a week now and even though I'm still fine-tuning my sub to try and gain every last ounce of performance from it, I am truly amazed by this sub's performance - and this is coming from someone who has owned the mighty THX-Ultra II certified Velodyne HGS-18. The sub resides in my 12 x 15 x 9 feet living-room and although some may see this as overkill, I think that it is better to have a sub that can over-perform in ones room than one that under-performs. I have my sub calibrated using Avia so that it reads exactly 85dB on my SPL meter and although I have experimented with tuning the sub at different frequencies using every possible combination on subsonic movies like Titan AE, LOTR, SW: TPM/AOTC, I find that leaving the sub at 25hz with all three ports open yields the best results. Regarding the subject matter, I tried out my new subsonic dvd tittled 'Solar Max' DTS by Imax and there is a chapter on there called (surprise, surprise) 'Solarmax' and I was not anticipating the sheer brute force of the subsonic bass that was soon to follow. It literally shook the house in a way I thought was not possible other than if there was an earthquake. Needless to say I had my Radioshack SPL meter handy and got a peak reading of 122dB (un-corrected) at -05dB. I was then brave enough (or stupid lol) to replay the same chapter but this time sticking my head right up close to the sub so that I got a clear view of the driver-cones to see just how much the driver was moving by. I could not get a precise measurement but it seemed as though the cone was moving no more than 15mm. I had a feeling that I might be able to get away with playing the same chapter at reference level without bottoming the driver but quite frankly I was far too frightened of what the outcome might be or the complaints I might get from my neighbors. What is the maximum peak SPL your sub has managed to pump out and do you have an idea of how much the driver/s from your sub was moving by? Btw this is slightly off topic but I have read PB2+ owners stating that on 'The Matrix' when Mopheus is fighting Neo and does his infamous flying knee-drop and lands into the ground, some people are getting around 115dB? Well I have played that scene with the HGS-18 and the PB2+ (tuned to 25hz/20hz/16hz)at reference level and I can't even get close to hitting 105dB let alone 115dB! Am I the only PB2+ owner not able to reach 115dB from that knew-drop lol?