Could somebody check this XO Please? - diyAudio
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Old 18th December 2014, 04:28 PM   #1
ODougbo is offline ODougbo  United States
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Default Could somebody check this XO Please?

This was a pre-made board and something seems fishy here. Could somebody check this please?

In particular the woofer circuit path:

IN bottom right, through the large coil, then terminated to the .22 smaller coil - then out

The speaker project is a 2-way - 832592 (8ohm) & MDT20

Other info: white coil is 16gauge sidewinder - smaller black .22 16gauge sidewinder
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File Type: jpg XO check.jpg (92.1 KB, 229 views)

Last edited by ODougbo; 18th December 2014 at 04:41 PM.
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Old 18th December 2014, 04:49 PM   #2
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Without knowing the schematic and the woofer (832592?) it is pretty difficult to tell anything about your XO......
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Old 18th December 2014, 06:15 PM   #3
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Pass. Need to know the drivers + their impedances & frequency response as mounted on the baffle. Without that, it's just flailing in the dark.
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Old 18th December 2014, 06:32 PM   #4
Lojzek is online now Lojzek  Croatia
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Quote:
Originally Posted by ODougbo View Post

IN bottom right, through the large coil, then
terminated to the .22 smaller coil - then out
It appears your LP filter is a 3rd order electrical with a C in series with R.
Caps 10uF +12uF look to be in parallel with RC. I could very well be wrong
about it.

L1=0,85 mH
R=8 ohm, C=22uF
L2=0,22 mH

Last edited by Lojzek; 18th December 2014 at 06:41 PM.
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Old 18th December 2014, 09:24 PM   #5
ODougbo is offline ODougbo  United States
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OHHH Third Order - was comparing it to a 2nd. Never would have guessed that!
No schematic, it would be nice to have one, was going to try to sketch one up.

Attached PDF for the WR130; never knew why they stopped making it, affordable, easy to work with....

Thank you.
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File Type: pdf 297-622.pdf (37.1 KB, 36 views)
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Old 18th December 2014, 10:10 PM   #6
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Assume this is the tweeter?

Morel MDT-20 1-1/8" Soft Dome Tweeter
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Old 18th December 2014, 10:29 PM   #7
ODougbo is offline ODougbo  United States
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Yes that is the tweeter.
The story is my friend upgraded their system and returned the speakers/boxes to me and now have a second chance to rebuild them.
Leaning to a 10 liter, rectangle box.
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Old 20th December 2014, 01:43 PM   #8
Dissi is offline Dissi  Switzerland
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I'm not sure at all if the attached schematic is correct, but it looks like a 2 kHz crossover without any baffle step correction. No bass and too much mids and heights?
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File Type: jpg CrossoverWR130MDT20.jpg (58.9 KB, 159 views)
File Type: jpg SimulationWR130MDT20.jpg (120.3 KB, 148 views)
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Old 21st December 2014, 11:39 AM   #9
ODougbo is offline ODougbo  United States
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Thank you Dissi!

The 22uf (10uf & 12uf) is curious, why didn't they use two of the same 22uf caps.
Three caps to ground that seems like a heavy load for a woofer that is known for a smooth response.
Tweeter circuit - it's a L-pad I think; there's a hidden 2.5ohm resistor behind the coil.

The bass may be lacking, it was screaming at me when I disconnected it, but that was only for a few seconds and this was now a Salvage Operation.

So yesterday went for it, ran the whole box through the saw and cut off the front baffle and started over. This time with felt lining, close tolerance driver recesses, moved the port and rounded over all the edges.
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File Type: jpg DSCN3465.JPG (222.4 KB, 128 views)
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Old 21st December 2014, 03:24 PM   #10
ODougbo is offline ODougbo  United States
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Finished it up and listened - oh boy it's awful.
Really thin, cold, predominate mid-range.

Even checked the tweeter in case it was not working - but fine (not blown).
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