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Old 19th September 2012, 09:35 AM   #131
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Naturally.

I still picture Sarah as Virginia in At Home with the Braithwaites -what was it one of the other characters called her? 'My chain-smoking, screwed up dyke of a sister.' Brilliant performance. And coming from an acting background, I don't say that lightly.
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Old 19th September 2012, 07:19 PM   #132
tvrgeek is offline tvrgeek  United States
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Too expensive for me. I mean Sarah. Plywood in not a problem if I can source local suppliers.
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Old 19th September 2012, 08:11 PM   #133
ODougbo is offline ODougbo  United States
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TVR. the trees are lousily in MD...but a lot of sheet good suppliers. Let me know.

Dave, amazing piano and great vocals on the 125's.
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Old 15th October 2012, 04:34 PM   #134
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what is the fs of the 125 in OB?
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Old 16th October 2016, 08:20 PM   #135
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I revive this old thread because i have obtained good result with a notch filter. I went on mh-audio.nl - Home for calculate a filter the most narrow as possible. The calcultor gave me : 0.033 mH, 16,2 uF and 17 ohms for 10 dB damping at 7khz. Then, i made a coil by hand , welded it with the caps and made a try. Bad result ! Rather no result at all, the filter was more like a wire. I made an impedance measurment with speaker workshop . The graph showed me that the filter was centered at 5600 Hz . I decreased by steps of 1 uF several times until the notch was centered at 7 kHz with the measured value of 12,9 uF. Then, i made a second try and i figured it out this time, harshness was dissapeared with no bad effect. The high was a bit laid back but i have no put any resistor. I plane to put 15 ohm. I'll post some pictures soon.

Guillaume

Last edited by killmister; 16th October 2016 at 08:34 PM. Reason: mistakes
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Old 17th October 2016, 05:38 AM   #136
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Hi !
Impedance measurement with notch (in enclosure) :

Click the image to open in full size.

Click the image to open in full size.

Last edited by killmister; 17th October 2016 at 05:39 AM. Reason: mistakes
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Old 17th October 2016, 01:11 PM   #137
xrk971 is offline xrk971  United States
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Nice result. Do you have speaker frequency response measurement after filter applied?
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Old 17th October 2016, 02:32 PM   #138
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Hi !

Unfortunately no because i haven't any acoustic measurement tool but, believe me, the speaker becomes more listenable with this filter . The sound is more relaxed and less colored and without any harshness. The medium frequency seems to be more focused too with a better 3D.
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