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In Reply to: RE: Observable Woofer Cone Movement posted by House13 on April 20, 2015 at 13:38:56
Obviously, everything I've said has fallen on deaf ears.
Yes, woofer pumping causes distortion.
Woofer pumping is a result of low frequency signals impressed onto the music as from a turntable. Speakers don't pump on their own.
Just because the music is being played through a computer does not mean it wasn't originally recorded from a turntable.
If this isn't clear to you then you must be an idiot.
Follow Ups:
You do not need to call me an idiot. Name calling is not appropriate here and I am offended by it. Your point of reference was unclear. You made no distinction between the program material and the equipment reproducing it in your statement.
One could see in the video that the front end was a computer not a turntable. It certainly is possible that the program material was originally analog. I have used analog front ends with some of the loudspeakers I have owned and never experienced any visible woofer cone excursions.
> You do not need to call me an idiot. Name calling is not appropriate here and I am offended by it.
You're right! I apologize.
I have used analog front ends with some of the loudspeakers I have owned and never experienced any visible woofer cone excursions.
Turntables can cause excessive woofer pumping because the phono cartridge reproduces very low frequency signals resulting from record warps as well as the inherent low frequency arm/cartridge resonance. Woofer movement from these types of signals is not desirable and causes increased intermodulation distortion.
The woofer movements in the video of the KEF Blade speakers were produced by a powerful bass drum, which is normal when listening at loud levels. That kind of woofer diaphragm movement is not a problem unless it exceeds the woofer's maximum excursion distance at which point it will cause distortion. However, it didn't appear to be distorting in the video and it didn't sound like it was distorting when I played it on my main system.
Again, I apologize for calling you an idiot.
Best regards,
John Elison
It's pretty obvious in the video that this is digitally sourced stuff being used as a demo. The pumping is just the bass in the song and not the random movement from vinyl.
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