I currenlty have a PB10 in a open plan room 25ft by 14ft with an opening for the stairs also. I am very pleased with PB10 performance up to about -10db where the it starts to suffer from compression limits and refuses to go any louder. This is OK for me as this is loud enough for me and my neighbours Now I have been spoilt with SVS bass I m considering going for a PB12 Ultra and wondered if any other PCU owners had similar size rooms and how they find the performance. I have been told I will get another 4-6dB clean output which will get me very close to reference level bass Considering the PB12 Ultra will cost me ~£1000 - PB10 Sell Price. What other subs did people dismiss what cost £1000 in the UK ?