Bushhorn Mk-2 Notch Filter?

Jhovis · 19th May 2004, 03:52 AM

It seems that we hijacked a non-horn post with horn questions and this question is still unanswered. I'm wondering if anyone can shed some light on the B'horn Mk-2 notch filter? I saw it on this site but didn't see the values of the components: http://www.geocities.com/northbirdte...hhorn_mkii.htm

I sent the owner of the site an email a few days ago, but the email address may not be active.
Thanks

GrahamnDodder · 19th May 2004, 04:27 AM

I was wondering the same thing, as I am building Mk II's right now, too. I e-mailed "Serge" several times over the last few months and got neither a bounceback or a response. Oh well.

FWIW I built these Solo 103's ( http://home.hetnet.nl/~geenius/Solo103.html ) which included notch filters. The values given are .82 mH coil, 4.7uF cap and 10ohm (10-watt) resistor.

Wire all three in parallel, then put the assembled filter in series between the binding post and the positive speaker terminal. BTW, use the lowest DCR coil you can reasonably afford. The bass passes through it and you sure don't wanna add any more resistance there than you have to.

This combo did a good job of removing any excessive mids from the Solo 103's. Absent any given Mk II values, I will likely use them for my Mk II's if they need a notch filter.

Hope that helps.

GnD

GM · 19th May 2004, 05:42 AM

Here's the FE103S notch filter, but for other drivers, ask Pit:
http://hometown.aol.de/hphinder/homepage/

GM

Jhovis · 19th May 2004, 10:45 AM

Now we're getting somewhere...thanks guys.
jeff

Ropie · 19th May 2004, 11:09 AM

Is the 'dustcapectomy' recommended for the FE103S with the notch filter in place? If so, is there a correct size/shape/material of phase plug required, or is room size and speaker location a big factor?

GM · 19th May 2004, 04:32 PM

Don't know about the notch filter issue, but phase plug shape is totally dependent on the specific driver. The material just ideally needs to be well damped, so wood/filled lipstick cap/brass rod/whatever are suitable.

GM

Jhovis · 20th May 2004, 01:01 AM

Serge's site also mentions using Damar varnish on the FE103s. Where on the speakers do you put it and what is it's purpose?
Jeff

GM · 20th May 2004, 01:52 AM

It's for damping resonances and is driver specific. Do a search on the FR forum, there's been many good threads on tweaking drivers. http://f18.parsimony.net/forum31999/ Most FR drivers need far more than just Dammar.

GM

19th May 2004, 03:52 AM	#1
Jhovis diyAudio Member Join Date: Sep 2002 Location: Atlanta	Bushhorn Mk-2 Notch Filter? It seems that we hijacked a non-horn post with horn questions and this question is still unanswered. I'm wondering if anyone can shed some light on the B'horn Mk-2 notch filter? I saw it on this site but didn't see the values of the components: http://www.geocities.com/northbirdte...hhorn_mkii.htm I sent the owner of the site an email a few days ago, but the email address may not be active. Thanks __________________ jeff

19th May 2004, 04:27 AM	#2
GrahamnDodder diyAudio Member Join Date: Jun 2003 Location: Near Baltimore, MD	I was wondering the same thing, as I am building Mk II's right now, too. I e-mailed "Serge" several times over the last few months and got neither a bounceback or a response. Oh well. FWIW I built these Solo 103's ( http://home.hetnet.nl/~geenius/Solo103.html ) which included notch filters. The values given are .82 mH coil, 4.7uF cap and 10ohm (10-watt) resistor. Wire all three in parallel, then put the assembled filter in series between the binding post and the positive speaker terminal. BTW, use the lowest DCR coil you can reasonably afford. The bass passes through it and you sure don't wanna add any more resistance there than you have to. This combo did a good job of removing any excessive mids from the Solo 103's. Absent any given Mk II values, I will likely use them for my Mk II's if they need a notch filter. Hope that helps. GnD __________________ I had the right to remain silent. I just didn't have the ability. (Comedian Ron White)

19th May 2004, 05:42 AM	#3
GM diyAudio Member Join Date: Jun 2003 Location: Chamblee, Ga.	Here's the FE103S notch filter, but for other drivers, ask Pit: http://hometown.aol.de/hphinder/homepage/ GM __________________ Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.

19th May 2004, 10:45 AM	#4
Jhovis diyAudio Member Join Date: Sep 2002 Location: Atlanta	Now we're getting somewhere...thanks guys. jeff __________________ jeff

19th May 2004, 04:32 PM	#6
GM diyAudio Member Join Date: Jun 2003 Location: Chamblee, Ga.	Don't know about the notch filter issue, but phase plug shape is totally dependent on the specific driver. The material just ideally needs to be well damped, so wood/filled lipstick cap/brass rod/whatever are suitable. GM __________________ Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.


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19th May 2004, 11:09 AM	#5
Ropie diyAudio Member Join Date: Jul 2003 Location: SW London	Is the 'dustcapectomy' recommended for the FE103S with the notch filter in place? If so, is there a correct size/shape/material of phase plug required, or is room size and speaker location a big factor?

20th May 2004, 01:01 AM	#7
Jhovis diyAudio Member Join Date: Sep 2002 Location: Atlanta	Serge's site also mentions using Damar varnish on the FE103s. Where on the speakers do you put it and what is it's purpose? Jeff __________________ jeff

20th May 2004, 01:52 AM	#8
GM diyAudio Member Join Date: Jun 2003 Location: Chamblee, Ga.	It's for damping resonances and is driver specific. Do a search on the FR forum, there's been many good threads on tweaking drivers. http://f18.parsimony.net/forum31999/ Most FR drivers need far more than just Dammar. GM __________________ Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.

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