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Old 7th March 2002, 09:25 PM   #11
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Default Aluminum

Gallo (www.roundsound.com) made the Nucleus units (not to be confused with the new small cheap stuff).

1. Generation: Fiberglass -- inexpensive, proably not all that effective.
2. Generation: Thin, "worked" Aluminum -- anodized. Work hardening of the metal + consider that Aluminum Oxide is a ceramic was supposed to move resonances beyond 20KHz. It worked quite well.
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Old 7th March 2002, 11:12 PM   #12
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The Gallo stuff looks neat. I read the reviews and started looking around for spheres.I found hard hats.Light,rigid,but kind of a tight fit for 6x9s. 2 layers of MDF at the opening could give me about 7" of depth,which is close to what some of the commercial enclosures have.The opening is not flat,but I'm sure that can be accomodated.If I had MDF on hand I'd be starting now.I know nothing about proper enclosure sizing,and I don't know if car speakers have published T-S parameters,which I think is where one starts,if one has a clue.For myself,I'm a beginner,but I'm willing to take a shot.
J
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Old 7th March 2002, 11:34 PM   #13
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Avoid fiberglass ... unless you are very experienced at using it and have the appropriate materials and can take necessary precautions to protect yourself ... lots of professionals who wear respirators while they work often still end up with serious health problems from it. You would actually be better off looking into Carbon Fiber.
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Old 8th March 2002, 02:27 AM   #14
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the health problems accociated with fibreglass are not from the fibreglass itself, but the resins that hold the fibreglass together and these same resins are used in carbon fibre, so Using carbon fibre will not prevent any health risk.
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Old 8th March 2002, 05:15 PM   #15
CHRIS8 is offline CHRIS8  United States
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"Chris and Dave-any chance of getting sketches of your design ideas? I can't quite picture what you mean. "

Here is an example(:this would work great with your leftover sonutube also, plus sonotube is much easier to work with).

(Note: baffle is 1" in this image, pipe wall thickness is exaggerated)

Click the image to open in full size.

http://64.33.91.28/images/6x9.gif

-Chris
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Old 8th March 2002, 05:29 PM   #16
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Thanks,Chris.That's easy to follow.I took a couple of hours off this morning and tried my brilliant hard hat idea. Excitedly hooked everything up and guess what-it sounds like two speakers in plastic cans.Maybe I should be on diyAudiodoofus.Oh,well.I do have some MDF.Next chance I get,I'll try your idea,Chris.It looks simple.Do you recommend sound-deadening material,or batting inside?
John
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Old 8th March 2002, 05:39 PM   #17
CHRIS8 is offline CHRIS8  United States
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"Do you recommend sound-deadening material,or batting inside? "

Well, probably a little acoustic foam on the walls, and just polyfill, fiberglass or dacron filler.

Regardless, the speaker is likely going to have a little bit 'honky' bass, as almost all car speakers(door, dash) are optimized for infinite baffle use. Just increase internal volume to the maximum that you can allow.

-Chris
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Old 8th March 2002, 08:16 PM   #18
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Are you trying to keep it simply and quick to build, or do you have plenty of time to throw at it?

How about light ply, like around 1/4 to 3/8" and brace the daylights out of it. I'm thinking internal brace structure resembling the arches and lattices of bridge supports. Of course it wouldn't be the quick way out.

The half tube idea mentioned above is clever.
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Old 8th March 2002, 09:47 PM   #19
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I don't have a lot of spare time these days.My original goal was to put together a higher-quality CD/radio than I could buy, that would be rugged enough to take to work.I'm a carpenter,and make lots of dust on the job.I put the head unit and power supply in a 24" long toolbox.I wanted to mount speakers in the box,too,but when I auditioned some I really wasn't satisfied with smaller than 6x9.I'd like something that I can transport in one trip-I feel kind of silly coming into someone's house with armloads of audio equipment.You get the picture.So I want the enclosures to be as compact as possible,but I sense that they need to be a certain volume to sound OK.So here I am.I might try Chris's idea,or I might just break down and buy ready-made enclosures until I can free up some time.
John
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Old 8th March 2002, 10:06 PM   #20
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Quote:
Originally posted by jbrom
I might try Chris's idea,or I might just break down and buy ready-made enclosures until I can free up some time.
I like Chris' idea too. For transport they could have latches on the side and snap together face-to-face with a carry handle somewhere.

You could ameriolate the size somewhat by making the cabinet aperiodic. My algorithm for such a thing is:
1/build a sealed cabinet as large as you figure you can get away with (assuming here that it is still smaller than an ideal sealed box).
2/ at the farthest convienent point from the driver, drill a number of holes (1"/1.25") with an equivalent area to the driver's Sd.
3/ behind this tightly place solid acoustic foam (i actually get away with salvaged open-cel packing foam -- despite that this is "officially" not at all the same as acoustic foam). Alternatively, put a rebate of about a 1/2" on top of the holes and compress fiberglass insulation into this rebate over the holes (1.5" compressed to 1/2' seems about right) and hold it in place with a mesh (ie the plastic stuff used from keeping crap out of your gutters)
4/ fill the box with poly fluff, acousta-stuff or whatever to make the box as large as you can.

dave
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