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Old 30th September 2012, 06:35 PM   #11
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Auricap XO... price is high.
Plus I need to combine 2 caps to get value required.
But why is this so important to put expensive capacitor on tweeter ... ?
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Old 30th September 2012, 06:44 PM   #12
xjr100 is offline xjr100  Europe
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Quote:
Originally Posted by voxxonline View Post
Auricap XO... price is high.
Plus I need to combine 2 caps to get value required.
But why is this so important to put expensive capacitor on tweeter ... ?
C2 is standart value - 5.6uF, no need to combine. This one I recommend to use good one.

Other caps you must combine - C5: 1.5+1.5 in parallel, C4: standart value 15uF, C3: 10uF 2pcs sequientially. Could be not such expensive.
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Old 30th September 2012, 06:55 PM   #13
system7 is offline system7  United Kingdom
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voxxonline, I don't want to worry you, because I might have misunderstood this, but is this a reputable design?

I just looked at those notches. The one on the bass makes sense. It is a 4.8kHz one to deal with a cone resonance on the SEAS ER18NX:
http://www.seas.no/index.php?option=...111&Itemid=133

But I can't make sense of either of the tweeter notches for the SEAS H1499-06 27TBCD/GB-DXT:
H1499-06 27TBCD/GB-DXT

These operate at 1.6kHz and about 6kHz. That makes no sense for a tweeter with a Fs of 900Hz and no obvious nasties. Check it yourself:
Alan Yates' Laboratory - VK2ZAY's Engineering Calculators - LCR Resonance
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Old 30th September 2012, 07:24 PM   #14
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I am building er18dxt ported two way speaker.
Cannot comment design qualities, I m just following guidelines
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Old 30th September 2012, 07:58 PM   #15
system7 is offline system7  United Kingdom
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Well, it's an odd design for sure.
The Seas ER18DXT ported two way

He seems to have a bee in his bonnet about a smooth power curve, enough to throw away most established ideas about equalising the tweeter Fs resonance on a low order design.

IMO, a third order filter achieves much the same thing as this tweeter filter even if properly executed, but hey.

http://www.seas.no/index.php?option=...274&Itemid=248
Attached Images
File Type: jpg Mark's_ER18DXT_Electrical.JPG (63.0 KB, 137 views)
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Old 30th September 2012, 08:04 PM   #16
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Confused dot com. I still can cancel my part from europe audio, but I did extensive research on what to build, and this one was highly favoured...
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Old 30th September 2012, 08:23 PM   #17
system7 is offline system7  United Kingdom
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Well, I don't know what you're going to do, my friend.

IMO, it's a rubbish design. He's just thrown a couple of random notches at the tweeter to get the frequency response flat. Really C4 should be around 50uF to hit 900Hz.

The bass, I like:
Sample projects

But I could be wrong. And I expect you could fit the SEAS Idunn tweeter filter anyway.
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Old 30th September 2012, 08:33 PM   #18
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Will see what to do tomorrow.
But its weird. This design is mentioned even by Zaph as a better alternative to his SR 71...

If I ll find more facts about fault in this design, will switch to my back up Troels design... or maybe something else.
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Old 30th September 2012, 08:45 PM   #19
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Not sure, but I think Markk explains something about it here...
Need ideas for 6.5 or 7 inch mid/bass in a 2 way system.
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Old 30th September 2012, 08:51 PM   #20
xjr100 is offline xjr100  Europe
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Quote:
Originally Posted by voxxonline View Post
... or maybe something else.
There is one prooven design which repeated many times, it uses same CA18ERX, but different tweeter from Seas - 27TDC . Crossover schematics is more simple, without notches (2 coils, 2 caps and 2 resistors only).

Will try to find a link, do not remenber where I saved it.

Added:
Here is the link to project: Optima SE
schematics from there:
Click the image to open in full size.
Cabinet:
Click the image to open in full size.
you can play with form of it - just keep clear internal volume ~15l (take in account, that crossover parts used there are quite big) and port tuning for 45Hz and front panel width.
Here is discussion on russian DIY forum about this construction: Optima SE
You can see some pictures there
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Last edited by xjr100; 30th September 2012 at 09:11 PM. Reason: added links
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