Fitzcaraldo215
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Interesting, but not clear in terms of how the "floor signal" was measured or what the vertical scale is. Presumably, the test tone is as received by a mike, but how far away? No idea how the floor signal might have been measured simultaneously.125 Hz tone played through speaker
Lower curve is floor signal when speaker on spikes
Same sine wave and speaker on soft feet - and the floor signal amplified x2 to even show something:
Personally, I would be interested in seeing overall response measured both ways by a normal omni mike at the far field listening position, not on the floor. Sure, the soft feet floor measure looks nicer, but does it produce a measurably different sound at our ears?
The test waveform speaker output is not obviously different between the two, though it might be slightly different. Hard to tell. But, the wavy peak/valley floor resonant behavior with spikes does not appear to be reflected in the output from the speaker. I suppose it is still possible that the induced floor "sound" and the direct speaker sound combine at our ears across the room.
Measurements are good. But, the real question to me is audibility to the listener. If the measurements from the listening position show nothing, I think audibility is highly unlikely. Even if measurements at the listener position show a difference, is the presence of the added floor sound audible or is it perceptably obscured by musical signal and other aspects of room acoustics?
Testing, as usual, might be tough. But, I continue to be inclined to believe that expensive, fancy spikes just ain't worth it in sonic terms.