S11 OB - Revisiting Desktop OB design using Seas 8" and Tang Band Full-Range - Page 2 - diyAudio
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Old 21st January 2010, 06:16 PM   #11
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Default Seas replacement

Very nice setup!

The Seas L21RNXP is no longer available. Any suggestions for an alternate driver?
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Old 7th February 2010, 06:45 PM   #12
Jaime is offline Jaime  Uruguay
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Eminnence LEGEND BP102
10" 92 dB xmax 10mm
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Old 11th February 2010, 02:19 PM   #13
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SEAS L22RNXP is the replacement of L21. Basically look for woofers with good response and distortion as usual, but with OB you want low Fs and high xMax.

I acquired another pair of L21 previously so I will see how an MTM would do.
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Old 20th May 2012, 04:58 PM   #14
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Hi gainphile,

maybe you remember my question about the W3 in your blog? Since then I made a pair of prototypes that play around half an hour now (so they are far from being "wobbled in").
As my miniDSP hasn't arrived yet, I play music over foobar's crossover plugin which works quite well. The amplifier is a modified Yamaha DSP-E1000 that isn't "DSP" anymore (a little modification I did). It is a capable and yet affordable amplifier.
I didn't ask you about the measures of the baffle you used but I think I came pretty close with some simulations in "Edge".
I wanted to thank you for the inspiration. Without your blog I wouldn't have tried an open baffle. It sounds real good now...and I hope it will be even better with the miniDSP and some measuring .
The current look of my desktop open baffle prototypes is attached.

Many thanks
Sven
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File Type: jpg DOB_02.jpg (490.4 KB, 621 views)
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Old 21st May 2012, 05:55 AM   #15
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Looks great! ... I'm planning to redo the baffles on my desktop OB with proper wood actually. Will document and let you know the settings.

Do you not hear any issues with the right speakers so close to the wall? They need some space to breathe.
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Old 21st May 2012, 10:05 AM   #16
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Actually I have limited space on my desk. I'm planning to move the printer to a different location as it takes about half of the available space on the desk. Without it, proper positioning should be possible.
That doesn't fully answer your question, right? Okay, I'm hearing some small issues that need to be addressed . But I have to measure the speakers before I change something.
They really sound quite good as they are. I guess that is what you can call a "promising concept" .
As soon as I have the whole system working (PC-miniDSP-Amp-Speaker) I'll start with the optimization. I'll keep you updated.
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Old 21st May 2012, 11:40 AM   #17
jambul is offline jambul  Belgium
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dear gainphile,
Nice & cleans et up. Do you have an idea how to use the fostex fe206 on them?
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Old 21st May 2012, 12:17 PM   #18
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Should be similar. Except that the Fostek would have higher sensitivity so you'd need to adjust accordingly.

In any case the xo should be kept between 900hz to 1.5khz to maintain best dispersion given by the 8".

But check out this ebay find. Can you imagine mating this with Seas W22 !!


Aucharm 4 inch Fullrange Speaker
eBay Australia: Buy new & used fashion, electronics & home d?r

Click the image to open in full size.
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Old 30th May 2012, 05:08 PM   #19
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Finally...

after some weird results I got more or less acceptable ones .
The attached picture shows the frequency response at hearing position with both speakers playing. I added a plot with an applied nearfield response (below 200 Hz).
It is not perfect yet but I keep trying. In fact it sounds better than before as I did wire the TB and the SEAS false on right channel . Now it is correct and it makes me .

Greets Sven
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File Type: jpg dob 120530.jpg (219.9 KB, 459 views)
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Old 14th July 2012, 04:26 PM   #20
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I'm now 'migrating' from ASP to DSP. Hope to post settings soon and compare notes.

I observed the audibility of Seas metal cone breakup. At the previous xo of 1.5khz they are audible, even with notches. At 1khz they are not audible whatsoever, even with no notch.

Click the image to open in full size.


I took the opportunity to reinforce the baffle using rear 3.5cm ribs. It makes them far more rigid.

Click the image to open in full size.
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Last edited by gainphile; 14th July 2012 at 04:29 PM.
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