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Hi again

I was plumbing the depths with my IB today using REW's "Frequency follows cursor".:meter: :nerd:

I reached 90dB @ 10Hz @ 9 feet and there was a background sound of galloping horses from my IB. A deep hollow sound like somebody beating a cardboard box in short cycles with a space in between. :holycow:

With less than 1/4" of cone movement at the time this suggests to me that the "cowboy" artifacts came from within REW. Or perhaps the electronics chain? Rather than caused by a mechanical problem. Had the drivers been hitting the endstops I think I would have heard a continuous rattle. :scratch:

REW's input barograph from the SPL meter was going up and down like the water in a U-tube! :sneeky:

At 15Hz the galloping horses had slowed to a canter. :no:

Any thoughts? :D

Thanks
 

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As Colonel Custers would say:

"well it's an IB, how many indians could there be in there?"

His last words could have been:

"damned harmonic distortion!!!"
 
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