So Yamaha says that the XP series has measured power from 20hz-20khz, but also has processing that enables a hpf at 55hz, 20hz or off mode. I would assume off is no filter and would allow playing below 20hz, but will have to do some research to see if anyone has commented on the output below 20. It does say after that 12db/octave, so I guess it would be down 12db at 10hz. If a system was capable of 130db at 20hz, one could eq and get fairly flat around 120db to 10hz in theory
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