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12th October 2006, 03:12 AM
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#4 |
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diyAudio Member
Join Date: Aug 2004
Location: Illinois
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Go here and ask your question. JohnK might answer or at least some of those who have tried his version might respond. The "filler driver" concept was thoroughly discussed there 2-3 years ago.
http://www.madisound.com/cgi-bin/audio_forum/index.pl |
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12th October 2006, 10:53 AM
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#5 |
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diyAudio Member
Join Date: May 2002
Location: Switzerland
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He might even answer here since he is a member of this forum as well.
 Regards Charles |
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12th October 2006, 05:52 PM
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#6 |
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diyAudio Member
Join Date: Feb 2003
Location: Hong Kong
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If I remember it correctly, JoknK once used the Vifa M11 as the filler driver. Later he switched to Vifa MG10. Unfortunately, both drivers were discontinued.
Wide bandwidth and gentle roll off at the upper end are the keys. |
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13th October 2006, 02:28 PM
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#7 |
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diyAudio Member
Join Date: Aug 2004
Location: US
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The filler driver concept work very well. However, as one poster all ready noted, finding a good filler is a tough act. You need a driver with very wide bandwidth that can handle the excrusion of a true 1st order at fairly low frequency. I currently favor my transient perfect 2nd order approach http://www.pvconsultants.com/audio/tp/tpdgam.htm
or if you have DSP and multiamp capability the subtractive delay approach http://www.pvconsultants.com/audio/tp/tpsd.htm I have a variety of transient perfect spread sheet here, http://www.pvconsultants.com/audio/frdgroup.htm
__________________
John k.... Music and Design NaO Dipole Loudspeakers.  "We have no right to assume that any physical laws exist, or if they have existed up to now, that will continue to exist in a similar manner in the future." Max Planck
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13th October 2006, 02:40 PM
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#8 |
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diyAudio Member
Join Date: Mar 2005
Location: Taiwan
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I believe Steen Deulund also embraced the filler driver concept.
__________________
Hear the real thing! |
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13th October 2006, 07:40 PM
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#9 |
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diyAudio Member
Join Date: Sep 2001
Location: Connecticut, The Nutmeg State
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I've got the article from the Journal of The Audio Engineering Society on my hard drive. Email me if you want it.
__________________
"A friend will help you move. A really good friend will help you move a body." -Anonymous |
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13th October 2006, 08:38 PM
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#10 |
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diyAudio Member
Join Date: Mar 2005
Location: Jacobsmountain
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Hi, Read here:
(1) http://www.soton.ac.uk/~apm3/diyaudi...r_drivers.html And if you download: (2) http://www.geocities.com/kreskovs/GenFiller.html Using (2) and setting Gamma = 1 gives you the graphing of the filter in (1) for all branches and in my opinion better than B&O’s because the resulting Q’s can be kept at 0.5. B |
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"Filler" driver ala B&O
