Newly born Bruce(s)

sp12c · 1st March 2008, 06:20 PM

First let me say, Wow. These are the first speakers I have built in almost 25 years and I wish I had not waited that long to get back into the hobby. The design of the double horn is something I have been dreaming of all these years, but never knew how to realize them 'till now. With the Fostex FE207E and the Bruce design I am hearing things I have not heard my entire life. I have but one question to ask. I have no damping in the cabinets and am wanting to know what is the recommended material and way (3 sides for a BR cabinet?) to dampen "Bruce" and what I can expect once dampened.

Christopher

ejfud · 1st March 2008, 06:27 PM

You have to share some pictures.

Cal Weldon · 1st March 2008, 06:30 PM

Yes, those are the rules. No teasing, we want pics. Your cooperation is greatly appreciated.

planet10 · 1st March 2008, 07:59 PM

Yes, where are the pictures

The air cavity is damped just like a bass reflex enclosure. If you added a holey brace for the driver, it is a very good place to hang some damping as well.

dave

sp12c · 1st March 2008, 08:32 PM

Yes, I know, pictures... They are coming, I promise. I am having a camera issue and my brother is coming over later with his. So I'll try and have something posted by tomorrow. Dave, what do you recommend as a damping material, and given the design of the Bruse what portions of the CC would you dampen. The last speaker I built those years ago what the recommended enclosures for the Electro-voice MC8A(s). Which I dampened with fiberglass on the back, top and one side.

Thanks,
Christopher

PS just an update on the sound, Quincy Jones, unbelievable!

Scottmoose · 1st March 2008, 08:39 PM

Half inch wool felt, one side-wall, top & back of the air-cavity, leaving the throat[s] unrestricted. That should be about all you'll need.

Glad you like them.

planet10 · 1st March 2008, 09:34 PM

wool felt, cotton felt, fiberglass insulation (1"), acoustic foam all have there adherents... we like the cotton felt (but haven't made Bruce (yet))

What do you have handy?

dave

loninappleton · 1st March 2008, 10:55 PM

I am trying the magnet wrap tweak on the Harvey and on a BIB too.

I made a cap for the magnet out of some thick flannel blanket and
secured it with a zip tie and carefully trimmed the excess off.

I see the Harvey BR is a different shape. Not likely I can duplicate
a variation with completed Harvey but I wondered why the difference?

Scottmoose · 2nd March 2008, 09:13 AM

Different driver = different requirements = different design.

kvk · 2nd March 2008, 12:10 PM

Epicski.com, one of the ski forums I regularly inhabit offers the following emoticon specifically for this situation...

1st March 2008, 06:20 PM	#1
sp12c diyAudio Member Join Date: Nov 2007	Newly born Bruce(s) First let me say, Wow. These are the first speakers I have built in almost 25 years and I wish I had not waited that long to get back into the hobby. The design of the double horn is something I have been dreaming of all these years, but never knew how to realize them 'till now. With the Fostex FE207E and the Bruce design I am hearing things I have not heard my entire life. I have but one question to ask. I have no damping in the cabinets and am wanting to know what is the recommended material and way (3 sides for a BR cabinet?) to dampen "Bruce" and what I can expect once dampened. Christopher

1st March 2008, 06:27 PM	#2
ejfud diyAudio Member Join Date: Feb 2005 Location: MN	You have to share some pictures. __________________ Gary One good driver is all I need.

1st March 2008, 06:30 PM	#3
Cal Weldon Speakerholic diyAudio Moderator Join Date: Jan 2004 Location: British Columbia	Yes, those are the rules. No teasing, we want pics. Your cooperation is greatly appreciated. __________________ Next stop: Margaritaville Some of Cal's stuff \| Cal Weldon Consulting

1st March 2008, 07:59 PM	#4
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 4	Yes, where are the pictures The air cavity is damped just like a bass reflex enclosure. If you added a holey brace for the driver, it is a very good place to hang some damping as well. dave __________________ community sites t-linespeakers.org, frugal-horn.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA

1st March 2008, 09:34 PM	#7
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 4	wool felt, cotton felt, fiberglass insulation (1"), acoustic foam all have there adherents... we like the cotton felt (but haven't made Bruce (yet)) What do you have handy? dave __________________ community sites t-linespeakers.org, frugal-horn.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA


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1st March 2008, 08:32 PM	#5
sp12c diyAudio Member Join Date: Nov 2007	Yes, I know, pictures... They are coming, I promise. I am having a camera issue and my brother is coming over later with his. So I'll try and have something posted by tomorrow. Dave, what do you recommend as a damping material, and given the design of the Bruse what portions of the CC would you dampen. The last speaker I built those years ago what the recommended enclosures for the Electro-voice MC8A(s). Which I dampened with fiberglass on the back, top and one side. Thanks, Christopher PS just an update on the sound, Quincy Jones, unbelievable!

1st March 2008, 08:39 PM	#6
Scottmoose diyAudio Member Join Date: Mar 2005 Location: UK	Half inch wool felt, one side-wall, top & back of the air-cavity, leaving the throat[s] unrestricted. That should be about all you'll need. Glad you like them.

1st March 2008, 10:55 PM	#8
loninappleton diyAudio Member Join Date: Feb 2004 Location: Appleton, WI	I am trying the magnet wrap tweak on the Harvey and on a BIB too. I made a cap for the magnet out of some thick flannel blanket and secured it with a zip tie and carefully trimmed the excess off. I see the Harvey BR is a different shape. Not likely I can duplicate a variation with completed Harvey but I wondered why the difference?

2nd March 2008, 09:13 AM	#9
Scottmoose diyAudio Member Join Date: Mar 2005 Location: UK	Different driver = different requirements = different design.

2nd March 2008, 12:10 PM	#10
kvk diyAudio Member Join Date: Jan 2008	Epicski.com, one of the ski forums I regularly inhabit offers the following emoticon specifically for this situation...

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