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Old 1st March 2008, 06:20 PM   #1
sp12c is offline sp12c  United States
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Default 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
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Old 1st March 2008, 06:27 PM   #2
ejfud is offline ejfud  United States
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You have to share some pictures.
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Old 1st March 2008, 06:30 PM   #3
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Yes, those are the rules. No teasing, we want pics. Your cooperation is greatly appreciated.
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Old 1st March 2008, 07:59 PM   #4
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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
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Old 1st March 2008, 08:32 PM   #5
sp12c is offline sp12c  United States
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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!
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Old 1st March 2008, 08:39 PM   #6
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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.
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Old 1st March 2008, 09:34 PM   #7
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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
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Old 1st March 2008, 10:55 PM   #8
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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?
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Old 2nd March 2008, 09:13 AM   #9
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Different driver = different requirements = different design.
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Old 2nd March 2008, 12:10 PM   #10
kvk is offline kvk  United States
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Epicski.com, one of the ski forums I regularly inhabit offers the following emoticon specifically for this situation...

Click the image to open in full size.
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