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Old 11th July 2003, 07:55 PM   #41
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Quote:
Originally posted by 7V
So, EC8010, I gather that there's aluminium on the inside and outside with foam in the wall. Is that right?

Also, what do you use for drive-units and how does it sound?

By the way, how near London and which direction?
Yes, you have that right. The cabinet is denser than you. You will be pleased to learn that it was designed for a Jordan JX92 (you probably guessed that from the volume). 7N7 has made his, but my projects run at a geological pace, so I haven't made mine yet. I thought 7N7s sounded good enough for me to commit money to the idea.
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Old 11th July 2003, 07:58 PM   #42
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Quote:
Originally posted by faustian bargin
wouldn't it be pretty close to pi*(a+b)?
Sadly, no. I thought this would be an easy problem. In fact, I assumed that we had covered it when we did "conic sections" at school, so I was very surprised to find that it's actually quite a hard maths problem.
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Old 11th July 2003, 08:12 PM   #43
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Default way OT now...

holy guacamole

you are right

i just googled, and here is a page that talks about elliptical circumference.



/andrew - is glad to be using CAD instead of a drafting board.
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Old 11th July 2003, 08:15 PM   #44
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Hi EC8010, I bet they look very cool

I just thought I would share my experences of this style of construction as i tried it when I was building the bottom end boxes for my current system.

My boxes use the same sort of curved back, only with a solid wood front. I used bendy MDF for the curved walls, and then filled them with expanding builders foam as you did.

However, I was unsatisfied with the sound of the boxes, and when I dismantled them for a rebuild, I found voids in the fill, some as big as 40 or 50mm across, and areas where the foam had barely expanded and was very solid. From this experience I hypothesise that you have to be very careful when filling to both avoid any trapped air, and get an even distribution of the foam to avoid the consistency problems I had.
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Old 11th July 2003, 08:15 PM   #45
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Default Re: Re: Re: Here's the full griff...

Quote:
Originally posted by EC8010
Just try finding the perimeter, though...
there is a readout for that too...

dave
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Old 11th July 2003, 08:18 PM   #46
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Default Re: Re: Re: Re: Here's the full griff...

Quote:
Originally posted by planet10
there is a readout for that too...
Did it agree with my values?
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Old 11th July 2003, 08:21 PM   #47
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Quote:
Originally posted by pinkmouse
From this experience I hypothesise that you have to be very careful when filling to both avoid any trapped air, and get an even distribution of the foam to avoid the consistency problems I had.
Sadly, you are right on the money there. That's exactly what 7N7 complained about on his first attempt at filling. I wondered if it was a chemical reaction between the aluminium and the foam, but if you had the same problem with MDF that seems unlikely.
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Old 11th July 2003, 08:23 PM   #48
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Default Re: way OT now...

Quote:
Originally posted by faustian bargin
Holy guacamole!
Absolutely.
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Old 11th July 2003, 10:50 PM   #49
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7N7 would like to contribute, but tells me that he is currently experiencing unexpected computer protocol/management problems vis-a-vis the forum...
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Old 11th July 2003, 11:05 PM   #50
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Default Harman Kardon Soundsticks

I think this is some kind of acrylic.

:)ensen.
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