Cowboys in my IB?

[Chrisbee]

Hi again

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

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.

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

At 15Hz the galloping horses had slowed to a canter.

Any thoughts?

Thanks

[brucek]

[Chrisbee]

[titch--]

lol

[Sonnie]

[drf]

As Colonel Custers would say:

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

His last words could have been:

"moo harmonic distortion!!!"

[Chrisbee]

This sounds serious!

Should I call the sheriff!

Or a mechanic?

Could my big ends be shot?