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Old 13th January 2009, 07:52 AM   #1
prezden is offline prezden  Canada
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Default First project complete

Hi All
Well I've completed the first part of my new Mac based stereo. Thanks to Dave at Planet10 for providing the drivers and the wonderful box design. Thanks also for everyone else who responded to my dumb questions. Next will be a pair of new front channel using some 3" Aurora's and ApexJr tweeters.

Cheers- Preston
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Old 13th January 2009, 09:33 AM   #2
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Details??
Details?
I never saw the initial query so what driver what type of box / tuning / dimensions etc;etc;etc
Nice work BTW. I love the colour. Which way does the vent fire into the room or towards the wall?

Regards
Ted
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Old 13th January 2009, 10:12 AM   #3
prezden is offline prezden  Canada
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Hey Ted- here's the details
The box is based on a planet10 design. The drivers are a pair of Eastech 7" in push push configuration with a front firing 3" flared tube port. It's built of 3/4" mdf. finished with 9 coats of paint and satin varnish. There are a pair of low pass filters using .15mh inductor and 4.7 cap. I'm not sure of the exact tuning. The dimensions are 24x 6.5x 14"

Cheers- Preston
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Old 13th January 2009, 10:51 AM   #4
sreten is online now sreten  United Kingdom
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Hi,

Two low pass subwoofer filters with 0.15mH and 4.7(uF?) ???
That does not sound right at all. (~ 2KHz L/R assuming 8R).

/sreten.
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Old 13th January 2009, 11:40 AM   #5
prezden is offline prezden  Canada
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Hi sreten
The filters are made of components I had at hand. I started a thread about filters:
Loudspeakers >need help with low pass filter
The filters are very much still under development. I don't really know anything about these things. What you you suggest for components? I found an online calculator the specified 10.6mh and 663uf.

Cheers- Preston
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Old 14th January 2009, 06:00 PM   #6
badman is online now badman  United States
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Are you running these with separate amplifiers than the main speakers?

If so, then check out the Harrison Labs line level products as you can get them to achieve the filter functions without giant caps and coils http://www.hlabs.com/

You pick a crossover frequency then get the fmods or other product to match it. It's not perfect, but a lot better than the filter you have now which is totally useless. The calculated values you posted would be much better but proper crossover design requires measurements, or at the very least, a more complex simulation and understanding of crossover issues.
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Old 14th January 2009, 07:31 PM   #7
prezden is offline prezden  Canada
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Thanks badman- These look like they might do the trick.
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Old 15th January 2009, 02:05 AM   #8
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line level is real cheap to DIY:
http://www.t-linespeakers.org/tech/f...ssiveHLxo.html
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Old 15th January 2009, 10:16 PM   #9
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Really nice colors on that speakers.
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Old 15th January 2009, 11:14 PM   #10
prezden is offline prezden  Canada
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thanks shadow
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