My Fostex 103's with open Baffle - diyAudio
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Old 28th March 2014, 11:56 PM   #1
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Default My Fostex 103's with open Baffle

Found the problem I was hearing and couldn't get rid of, "Never front mount your driver". Flipped the baffle around and rear mounted it, all better now.

Video here:
https://www.youtube.com/watch?v=rpWo...ature=youtu.be
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File Type: jpg ThickBaffle.jpg (130.6 KB, 451 views)

Last edited by cradeldorf; 29th March 2014 at 08:09 AM.
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Old 29th March 2014, 07:46 AM   #2
Philfr is offline Philfr  France
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Hi,
Nice speakers..
I try this way, but in my case it don't works.
Using a W5 1611 TB Speaker on open baffle (12 inches widht), I make near field mesurement :

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Phil.
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Old 29th March 2014, 07:58 AM   #3
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I guess I don't understand why you think it doesn't work good? could you explain more as to why you don't like it? (are you going by what your measurement says? or what your ears say?) When I had mine front mounted there was a non natural sound to them. that's why I went to rear mounting and now they sound uncolored. I would think having your driver that close to the edge they would be canceling out quite early? not to mention the baffle step must be pretty steep having your driver that close to the edge.

Last edited by cradeldorf; 29th March 2014 at 08:11 AM.
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Old 29th March 2014, 07:59 PM   #4
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Hard to tell definitely from the video but I've heard several small open baffle Fostex drivers which are driven too hard and into distortion. You would be so much better off with a large woofer to cover the lowest bass region and then use a crossover to the full range driver ala Martin J. King ideas from several years ago. Real bass with a relaxed and more accurate overall sound.

Quarter Wavelength Loudspeaker Design

Addition: For cradeldorf: BTW open baffle speakers radiate into 4 pi space so they don't need baffle step correction. Mounting the driver too close to the edge of the baffle will shorten the path length from front to back in an open back design. That raises the short-circuit frequency for the open back speaker which means that the 6 dB per octave roll off is negatively impacted.

Last edited by Jim Griffin; 29th March 2014 at 08:11 PM. Reason: addition
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Old 30th March 2014, 03:17 AM   #5
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Thanks Jim, I actually have a 12" dayton sub going too. You probably can't see it in the video. And I agree with all that you have said.
Okay, today I added some 4" carpet strips to the edge of my baffles front and back and removed all crossover parts. This is where they are as of tonight.

Here's a video of them in action.

https://www.youtube.com/watch?v=fNRn...ature=youtu.be
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File Type: jpg BaffleWithEdgeCarpet2.jpg (154.4 KB, 357 views)

Last edited by cradeldorf; 30th March 2014 at 03:21 AM.
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Old 31st March 2014, 02:06 AM   #6
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Thanks to Jim, At 3:30 am I decided to stuff the Alphas back into the baffles and give them another chance. I ended up with the martin king original HP filter (24uf cap 4mh coil) The trick was to reverse the polarity of them. On the LF side I went with a 1st order with a 1.5mh coil. It's better sounding than it was. I'm also still running the sub for the floor shake, gotta have it for movies.

Video here:
https://www.youtube.com/watch?v=LqOu...ature=youtu.be
Attached Images
File Type: jpg OBwithAlpha.jpg (129.7 KB, 105 views)
File Type: jpg OBwithAlphaSetup.jpg (105.5 KB, 126 views)

Last edited by cradeldorf; 31st March 2014 at 02:11 AM.
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Old 31st March 2014, 02:19 AM   #7
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Sounds better to me. More bass and a good balance with the Fostex. Excellent progress.
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Old 31st March 2014, 02:20 AM   #8
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Quote:
Originally Posted by Jim Griffin View Post
Sounds better to me. More bass and a good balance with the Fostex. Excellent progress.
Thanks Jim on both counts. I actually built Martins OB's about a year ago so I had all the parts.

Last edited by cradeldorf; 31st March 2014 at 02:22 AM.
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Old 6th April 2014, 06:07 AM   #9
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Just an update, been playing around with some carpet on the baffles. They look God ugly but boy do they sound nice. Sorry I can't convey the total experience but I'll give ya what my camera is capable of recording.

Video Here:
https://www.youtube.com/watch?v=Bzd2...ature=youtu.be
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File Type: jpg OBwithAlphaAndCarpet.jpg (120.9 KB, 109 views)
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Old 6th April 2014, 01:59 PM   #10
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Here's a little Sunday Morning Jazz Brunch. Much better.

https://www.youtube.com/watch?v=nWmb...ature=youtu.be
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