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Multi-Way Conventional loudspeakers with crossovers

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Old 15th October 2012, 06:47 PM   #701
Starre is offline Starre  Sweden
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I have tried it tonight and altough it dampens the panel it seems like the difference is small at listening position. It seems the problem is not the back panel but something else. I have a "shouting" effect somewhere around 400-500 Hz that comes through when listening. Have to find out what it is. I have seen a peak at about 500Hz measuring the speakers in room.
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Old 15th October 2012, 06:49 PM   #702
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You never give up Starre?
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Old 15th October 2012, 06:51 PM   #703
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When you measure a sizable peak it can not come from the cabinet. You could try an LCR trap in the crossover.
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Old 15th October 2012, 07:13 PM   #704
Salas is offline Salas  Greece
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Can he see same boost in near filed and far field? Mono and stereo? If its far field only it can be room reverberation build up, he is measuring with 1/3 Oct. RTA if I remember correctly.
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Old 15th October 2012, 08:09 PM   #705
Starre is offline Starre  Sweden
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I did a measuring at about 1 meter once and it looked better in that regards so I think and hope it is mostly the room affecting it, I will find out what is the problem with more measuring I am sure. RTA like you said Salas, I will also try full range measurings more careful, I did it once and it did look like a comb filter almost, I could clearly see the room making it hard to measure. And of course I do not give up since I think I can still improve things.
But if I get the explanation to this problem I have that is the end of it. Thanks Joachim, I hope that is not needed.

Last edited by Starre; 15th October 2012 at 08:12 PM.
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Old 16th October 2012, 07:15 AM   #706
Starre is offline Starre  Sweden
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Can a standing wave inside the cabinet cause a peak at about 500Hz? If f=500Hz that gives a wavelenght of 0,68 metre.

Last edited by Starre; 16th October 2012 at 07:26 AM.
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Old 16th October 2012, 08:53 AM   #707
Salas is offline Salas  Greece
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If it was somewhat shorter it could be related to height mode if not damped enough with padding.
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Old 16th October 2012, 09:17 AM   #708
Starre is offline Starre  Sweden
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Ok, I will try to find out what it is, I still think it is room related, I will get back when I have some info from my measurings.
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Old 17th October 2012, 09:04 PM   #709
Starre is offline Starre  Sweden
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I did two measurings at listening position and in front of one speaker at about 1 metre with both speakers playing white noise. It looks like it is mostly the room since at 500Hz it is first a little peak and then at 1 metre it is a dip.
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Old 17th October 2012, 09:07 PM   #710
Starre is offline Starre  Sweden
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The dip over 16kHz I do not know why it is like that since I have measured before and did not have such a big dip.
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