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In Reply to: RE: i'm lusting after KEF LS50 coincident driver 2 ways about now posted by budget minded on September 11, 2014 at 17:44:44
The crossover appears to be 2nd order acoustic, but they put the WOOFER in negative polarity and not the tweeter. This gives in *initial* positive going impulse response.
I now wonder about this "putting the woofer negative instead of the tweeter" for 2nd order designs requiring a polarity flip...
I wonder how this would play out sonically...
HMMMMM.
Copper color will grow on you. I have WMTMW's with Vifa MG10MD0908 fiberglass-cone mids and they are quite an ugly yellow color. You get used to it.
Cheers,
Presto
Follow Ups:
Assuming that one is able to detect mixed polarity in a multi-driver array, how would the entirety of the signal be perceived if only the initial "attack" phase of the signal is unified in polarity?
That is the question of the hour.
But since it's just the antithesis of the "2nd order with inverted tweeter" it *may* only be an absolute polarity discussion.
Or, due to the way we perceived sound, may not be.
I'm just asking the questions here because although I understand the theory (to an extent, with some practical experience) my own "jury is still out" on the entire subject of absolute polarity.
Even a 'transient accurate' 4th order compared to a "phase mangled" 4th order (with 4th order group delay) is not a "day/night" sonic scenario as many want to believe. I've listen to both scenarios *through the exact same speakers* with nothing else changing but the group delay correction. After doing many "on/off" comparisons, I gotta say... after believing it to be a panacea when I got into the subject, I now believe for some it may not be a big deal and for others it's not a concern at all.
To this day I still wonder to what extent my mind is telling me I hear better sound when I am visualizing the measured response in my head.
That near-perfect parallax impulse with almost zero over-shoot...
Mentally, these images are very powerful for audiophiles, especially someone who takes measurements and makes corollary with the sound. The human brain seeking corollary and explanation can often be as much of a hindrance as it is a help.
Cheers,
Presto
It is said that the initial attack of a sound is the thing that helps us to identify it's true character or nature. The proponents of time-coherent loudspeakers seem to believe that, unless all drivers are polarity matched, the leading edges or the "attack" phase of sound becomes smeared. This, in turn, is said to create a loss of natural sounding detail among other things.
Could it be that KEF was simply trying to create a happy compromise between amplitude response, good dispersion characteristics, and time coherency in the LS50 by using the method described by you above?
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