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Old 21st October 2008, 10:23 AM   #21
Formerly "jh6you". R.I.P.
 
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Redrawn based on your advice.
Thanks very much.

Cheers,

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Old 21st October 2008, 12:18 PM   #22
Tea-Bag is offline Tea-Bag  United States
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Default Re: You are real close

Quote:
Originally posted by Jon Ver Halen
.

I used 18mm baltic birch for the initial trials. Then switched to 45mm thick maple. Maple did sound better, it is more rigid. Be sure to use spikes between the floor and the baffle, they help a lot.


Good to see you on the boards Jon. I used similiar to what John describes for OB1 like design with half-side wings (per his recommendation). I used two 3/4 boards sandwitched together. One thing I dont think has been discussed before that I have seen is mounting with spikes. Mine are laid on al layer of thing 'real' wool felt, and a layer of thinker 'fake' felt on soft pine plank floors. Maybe the lower end will control itself better like this.

I would like to know what others are doing.
Mike
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Old 21st October 2008, 03:11 PM   #23
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Hi Babowana

Quote:
Redrawn based on your advice.
Looks perfect

Hello Mike

Quote:
I used two 3/4 boards sandwitched together.
I considered this, and did not use it only because I thought solid maple looked better. This should work just fine.

Quote:
Maybe the lower end will control itself better like this
At RMAF we had our spikes show up a day late. 1st day we were on carpet, 2nd day on spikes. We had "boomy" bass the 1st day, not after the spikes. Even the midrange got cleaner. I am a big believer in spikes.

On my hardwood floors at home, which my wife does not want spike holes in, I have to put small blocks of wood on the floor ( I use 2" x 2" x 3/4" maple) and then put the spikes on top of those blocks.
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Old 24th October 2008, 01:53 AM   #24
Formerly "jh6you". R.I.P.
 
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Dear Jon,

I received your e-mail including the attached open baffle drawing. I read the drwing, using an autocad software. The drawing looked beautiful and all dimensions were figured very clearly.

Thanks for your kindness

Cheers,

JH You
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Old 24th November 2008, 07:32 AM   #25
kirbyt is offline kirbyt  Canada
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Why 18in x 40in baffle? Is it the optimum size or would a larger baffle be better in this set up?
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Old 24th November 2008, 11:18 PM   #26
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Default Best size?

The best size for an open baffle is very much a taste thing. As the baffle gets larger, you get to lower the crossover frequency and keep the Lowther running the mid-bass.

Bigger baffles tend to close in the soundstage slightly. This effect is room dependent, larger rooms are not as affected as much as smaller rooms.

The Tone Tubby was chosen because it could easily crossover at the 200 hz. level, and I liked the more open soundstage in a smaller room. As they say, YMMV.
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