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Overlapping Xover bandpasses/points |
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_djk_ 
Old Croc 
Joined: 23 November 2004 Location: United States Status: Offline Points: 6002 |
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 Posted: 19 September 2017 at 11:28pm |
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A pole is 6dB/oct and has 90* phase shift.12dB has 180* and when in
phase cancels at the crossover point leaving a hole.If you hook one of
the drivers out of phase the hole goes away but it doesn't sound right.18dB
either leads by 90* or lags by 270* at the crossover point.While flat
connected either way it doesn't sound right.24dB has 360* and is flat
and sounds right.It is possible to correct for the phase funnies in 12
and 18dB crossovers by using a filler driver.A 12dB with filler is the best I have heard.See the patent for details.
https://docs.google.com/viewer?url=www.google.com/patents/US4031321.pdf |
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djk
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Elliot Thompson
Old Croc
Joined: 02 April 2004 Location: United States Status: Offline Points: 5175 |
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Posted: 20 September 2017 at 12:48pm |
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Here is the video I made years ago comparing Phase Versus dB Slope.
Best Regards, |
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Elliot Thompson
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taurusty
Registered User 
Joined: 09 January 2007 Location: Jamaica Status: Offline Points: 473 |
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Posted: 26 October 2017 at 2:18pm |
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So DJK, 48 db/oct would also be 360 deg, correct?
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toastyghost
The 10,000 Points Club 
Joined: 09 January 2007 Location: Manchester Status: Offline Points: 10919 |
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Posted: 26 October 2017 at 3:21pm |
In the electronic domain, yes. |
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taurusty wrote: