Ambient noise level seems to be about 50dB. The increase between 80 and 125 Hz is at a point a little higher in the spectrum than I would have thought. +9dB at 100 Hz is a little odd? Room is 15x28x8 with lots of stuff in it.
Wayne Parham Messages: 18719 Registered: January 2001
Illuminati (33rd Degree)
That looks pretty good to me, Bill. In room response good to 25Hz and less than 10dB variation from 25Hz up. Response flat +/-5dB. When I measure stand-mounted studio monitor type speakers, I usually see a 15dB+ dip just from floor bounce, even if measured outdoors. A tight room with solid walls like a basement gives almost 20dB room modes. Rooms with framed drywall construction aren't usually that bad because the walls have some "give" and tend to damp the modes. So you can expect less peaky room modes in rooms with drywall walls. All in all, I'd say your response looks pretty good.
Wayne Parham Messages: 18719 Registered: January 2001
Illuminati (33rd Degree)
You're right about bass under 30Hz, especially at moderate listening levels. Deep bass isn't so much heard as felt, and you really need the power levels to be high enough to vibrate your body for infrasonic bass to be noticed. Below 30Hz or so, it stops becoming sound you hear and becomes more of a tactile sensation. See the Fletcher-Munson curve:
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