Those numbers are from revision 1 of the FV18. The new FV18 revision 2 has 4"' ports instead of 3.5" and you can also get a paper cone version which adds even more output. You are correct. Brian has confirmed that below 40hz the version tested at databass has identical performance to the rev 2 paper cone and above 40hz the paper cone has +3db more output. Sent from my iPhone using Tapatalk