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Multi-Way Conventional loudspeakers with crossovers

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Old 21st September 2012, 12:57 AM   #61
a.wayne is offline a.wayne  United States
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You guys do realize there's deadtime involved, when doing gated measurements it's not all text book out there...

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Old 21st September 2012, 02:28 AM   #62
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Are you talking about the time before time zero a.wayne?? I do vaugley remember that setting the gate further before time zero (zero padding??) could be used as a technique to get lower frequencies in your gated data, but It's not something that appears to work with holm... I think I used the technique in the past with speaker workshop, but abandoned it in preference of holm due to never being able to get consistent results with SW.

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Old 21st September 2012, 05:44 PM   #63
JohnPM is offline JohnPM  United Kingdom
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Originally Posted by sometimesuk View Post
if it takes 4.4ms for sound to travel five feet, assuming the microphone and speaker are both equal distance from the wall, then that gives you a window of at least 8ms to take a reading, as it would take the same time for the reflection sound to travel back to the microphone?
It depends how far apart the speaker and mic are. When trying to capture speaker response the mic is generally fairly close, in which case using the distance to the nearest surface is conservative. If they are further apart, the window could need to be even narrower - for example, if the nearest surface was 5 feet away but the mic and speaker were 10 feet apart, the shortest path that includes the surface would only be 4 feet longer than the path taken by the direct sound and would arrive 3.7 ms after it. In practice the window can usually be set by looking at the impulse response to identify the earliest significant reflection.
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Old 6th October 2012, 10:54 PM   #64
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my latest in room mesurement , after a lot of messing with eq and xover this sounds best to me

mesure.jpg
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Old 7th October 2012, 11:31 AM   #65
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You like bass and treble tiz-boom ?
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Old 7th October 2012, 12:47 PM   #66
a.wayne is offline a.wayne  United States
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Originally Posted by lduarte1973 View Post
my latest in room mesurement , after a lot of messing with eq and xover this sounds best to me

Attachment 305049
Can you post pics of your speaker , by recessing the middle you may be trying to hide some kind of obvious ringing taking place in your midrange driver , due to
1. Driver
2. Poor design of xovers
3. Cabinet design ...
4. All of the above


Can you also post a pic of the impedance magnitude and phase ..?
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Old 8th October 2012, 07:27 AM   #67
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im forbidden by my wife to make any room treatment and without it the room is very reverberant to mid frequencies.The cabinets are from JBL LX400 , and have a ressonance around 1.2k because the baffle is too narrow.
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Last edited by lduarte1973; 8th October 2012 at 07:41 AM.
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Old 8th October 2012, 08:24 AM   #68
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Originally Posted by jerome69 View Post
You like bass and treble tiz-boom ?
i listen mainly to rock music so i need some bass boost and i like a litle treble boost also , but i still need to take care of that peak near 20k
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Old 8th October 2012, 08:26 AM   #69
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Originally Posted by a.wayne View Post
Can you also post a pic of the impedance magnitude and phase ..?
ill post it in the evening
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Old 8th October 2012, 08:14 PM   #70
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Impedance magnitude and phase

mesure.jpg

speakers :

lx400.jpg

7" woofer ; 5" mid ; 1" tweeter
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Last edited by lduarte1973; 8th October 2012 at 08:29 PM.
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