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Old 10th May 2008, 12:33 PM   #1
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Default about to build my first set of harveys

knocked up a quick cad model of the (almost) finished design. its still a harvey deep down, the only thing i've changed is a few aesthetic bits.........

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a quick question, on the design diagram on the data sheet, one of the critical dimensions is a bit hazy, at the rear of the driver, near the back panel, it says that it needs to have a 2 6.4mm passages. but the drawing shows 7.1........... its only .7 of a mm but i beleive this is a pretty critical distance.......
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Old 10th May 2008, 12:36 PM   #2
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sorry, the data sheet in question

http://homepage.mac.com/tlinespeaker...ey-1v1-map.pdf
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Old 10th May 2008, 03:11 PM   #3
gychang is offline gychang  United States
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Default Re: about to build my first set of harveys

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Originally posted by seventynine


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just imaginative, great project. Please many pictures as u build.

gychang
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Old 10th May 2008, 03:57 PM   #4
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1/4in = 6.350mm. Round 'er up to 6.4mm. I designed it using Imperial as I've never liked metric. The 7.1mm will be a typo.
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Old 10th May 2008, 04:22 PM   #5
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Brilliant.. just the kind of artistik licence we love to see. Do make sure you get sufficient bracing in the back bits and legd to keep them from ringing (that back hump is probably large enuff to stuff 1 or 2 sealed SDX7 into for some stealth bass.

dave
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Old 10th May 2008, 04:26 PM   #6
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Default Re: about to build my first set of harveys

Quote:
[i]Originally posted by seventynine a quick question, on the design diagram on the data sheet, one of the critical dimensions is a bit hazy, at the rear of the driver, near the back panel, it says that it needs to have a 2 6.4mm passages. but the drawing shows 7.1........... its only .7 of a mm but i beleive this is a pretty critical distance.......
The 1/4" (6.4 mm) is correct. I't looks like i mucked the drawing up a bit.

dave
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Old 10th May 2008, 04:53 PM   #7
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I have my Harvey build up and connected again. Will be interested
in your progress.

One thing of note was a modding thread about making a streamlined extension on the Fostex to smooth the back wave. That looked like it would have application on your design.

Best of luck with it. I'm interested in everything Harvey. And there's a Harvey builders thread. Please consider updating to it.

Harvey Builder's Thread
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Old 10th May 2008, 04:55 PM   #8
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i've changed a bit of it this morning, the 'hump' will be filled with something, probably glass fibre or something to make it a bit harder. and the base is big enough for 50kg of sand to sit nicely in there so they don't fall over but more importantly give a nice solid base to damp any resonance etc.

thanks for the info in the dimension change, i used that one anyway, as it seemed the most logical
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Old 10th May 2008, 04:57 PM   #9
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i'll read through that now, thanks. i should be able to get cracking next week once i've got my exams out the way, i'll be using Fostex FE126's BTW
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Old 20th December 2013, 09:58 PM   #10
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so 5 years later i finally built SOMETHING, obviously things moved on since then, and since i had the Fostex sat under my bed i figured i'd better do something

seemed to make sense to do the FH Mk3's after an evenings reading, but with a slight twist

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tesselated them onto a sheet of 4x8 and had them cut

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the slight twist was that i wanted a bit more weight to them, so decided to put an extra pocket in the bottom to accomodate half a bag of sand...

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figured i'd biwire some CAT5e for the wiring, after spending ages looking at binding posts and not finding anything that took my fancy for the price range i decided to leave them out

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bit of wadding

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and in goes the sand

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and a bit of vinyl -

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5 years later we have some speakers :lol:

blown away with the sound those little drivers can make

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