Hi
I have been playing around with REW's sinewave generator option.(again)
Measuring cone excursion is a bit of a trial. (and error)
I set up a lab retort stand with a dowel clamped vertically in front of my IB drivers. Then I made a sort of flag indicator out of folded masking tape pointing straight at one of the driver dustcaps.
I used a handy measuring device to set up a safe 10mm distance between the tip of the flag and the dustcap then started the 10Hz sinewave signal.
That was when the dowel started vibrating to match the vibrations of the subwoofer. Grr.
The dowel was quickly replaced by a long length of stainless steel tube. I remade my flag indicator and measured carefully to the dustcap again.
This was much better but it seemed difficult to get anywhere near +/-10mm without the sound output levels getting very silly indeed!
The driver cones seemed to be thrashing in and out wildly even at this rather modest excursion. I'm not very brave when it comes to watching my driver cones slowly destroy themselves.
So, how do you measure excursion
safely when testing your own subs?
