Hi,I used to have a self build sub from iplacoustics.co.uk which i sold to a friend. In his room, 15ft x10ft x 7.6ft(ceiling)the sub really kicked you in the chest unlike in my room.He has wooden floor boards, myself concrete. I bought a PSB 12 ISD hoping for that feeling with the bigger driver etc in my 17ft x11ft x8ft(ceiling) room.I have lower frequencies but still no thump or shock for anyone not hearing D/digital as they should. I have a DC1, Parasound 1205 and a Limit 900se player. The l/r and centre are from iplacoustics and are in my veiw very good, rears are Eltax bipolar.Just purchased a BFD which i have had trouble introducing but getting the hang of.I have a large 50hz to 56hz rise of 10db which i tamed. However with or without this rise i never get that thwack which my friend gets. All channels have been calibrated, speakers and sub tried on different crossovers, 40,80,120HZ re-callibrated via the DC1 and BFD , DC1 sub out to LFE in on the 12 isd. Do i need to move. Anyone near Southend on sea for a demo of theirs ?. Puzzled Phil.