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Old 16th May 2019
  #96
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https://en.audiofanzine.com/active-m...ty-giants.html

SM9 shows a fairly steep roll-off starting at around 40Hz (maybe 39Hz), but that roll off is quite significant, and seems to be around 16dB down at 30Hz and flat at 40Hz.

What's going on here? Is it the room, or is this speaker actually really capable of putting out 30Hz at the specified -3dB? If it is the room, it must be a very small room to produce that sort of loss of extreme low bass.