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Multi-Way Conventional loudspeakers with crossovers

W20RC38 / Morel CAT 298 [or MDT 28]
W20RC38 / Morel CAT 298 [or MDT 28]
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Old 26th March 2020, 04:56 PM   #11
ODougbo is offline ODougbo  United States
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Join Date: Aug 2011
Location: Maryland USA
Talking Just another 2-way

Well was side tracked a bit but assembled/tested the xo from the last post.
I think its fine and on the 1st attempt (lol after many, many other dud speaker projects)

Thinking the morels I have laying around are mismatched, but the xo was wrong anyway.
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File Type: png SF SB test xo.png (91.0 KB, 30 views)
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Old 26th March 2020, 05:15 PM   #12
system7 is offline system7  United Kingdom
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Join Date: Aug 2008
Location: Portsmouth UK
IIRC, Morel tweeters need some unsoldering to sort out any dried-up ferrofluid. Which just turns to sticky sludge after many years. Killing the output.

But I would be checking them for that if ancient.

I'm having a good time with my current effort:

Click the image to open in full size.

Click the image to open in full size.

I ditched the 0.47uF/22R tank notch. They are a dubious fix IMO.

I don't see much wrong with the bass filter for your flutes with the LCR notch.

What transforms the speakers is a grille cloth, IMO.

May my problem be diffraction?-morel-ma-bathrobe-im000890-jpg

The ancients used to use some cloth with a bit of spongey foam added. Maybe they knew something. The return of the smooth!
Best Regards from Steve in Portsmouth, UK.
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Old 28th March 2020, 09:10 AM   #13
ODougbo is offline ODougbo  United States
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Join Date: Aug 2011
Location: Maryland USA
Thanks for the morel tips and your design, never would have thought to do a complete over-haul, unsoldering and then cleaning. I'll have to make a board with cutouts and attach a few for testing, to check for a matching pair.

I remember back buying all these morels, most sounded clear as a whistle, whereas a small percentage had a secondary tone/buzz. Never did figure that out.

[Replacement VC's are available for $27]

W20RC38/8 and SB29RDC Budget Build
Another marathon day yesterday, complete overhaul of the gray-primer mdf boxes: replaced the tweeters, added bracing, retrofitted the xo's and tested.
The 8" woofer is musical and has wonderful bass (with the PE P-core baffle step coil). Used a 6.8ohm resistor for the tweeter.

Both speakers here:

W20RC38 8 3~28.png

Checking out the CDs - nice!

Last edited by ODougbo; 28th March 2020 at 09:15 AM.
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