Planar Speaker Asylum

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Planar Speaker Asylum

You've already done the best thing you could do, IMO, by actively biamping. :)

45.36.115.230

In Reply to: RE: 3.6R crossover mods posted by watts on December 27, 2022 at 14:11:48

But you've done a nice job with the M/T crossovers. I've biamped my 3.6Rs to beneficial effect, but probably won't take the plunge you have with the internals. I've already had the socks off once, and don't want to go through that again!

Mark in NC
"The thought that life could be better is woven indelibly into our hearts and our brains" -Paul Simon

Follow Ups:

RE: You've already done the best thing you could do, IMO, by actively biamping. :) - watts 11:25:15 12/28/22 (0)
My fingers are still hurting from pulling out the infinite number of staples. I got smarter with the second panel though: I was actually able to pull out the tweeter wire from its slot underneath the sock and put in the replacement with all the staples under the tweeter array in place, and only needing to pull up the sock on the bottom portion, which is much easier.
RE: You've already done the best thing you could do, IMO, by actively biamping. :) - Roger Gustavsson 00:17:43 12/28/22 (5)
It looks great. Are the values of the components similar to the original ones? Maybe, different slopes could have been tested.
A second look made me wonder. The coils in series with the midrange look tiny to me. What DCR do they have? Of the original coils, I think only the one with the iron core is kind of "cheap". The other coils are probably okey.

Edits: 12/28/22
- RE: You've already done the best thing you could do, IMO, by actively biamping. :) - watts 11:39:17 12/28/22 (4)
  Identical, yes. Here is the stock network to compare. Actually, I didn't notice this until now but the 0.1 uf bypass filter is not on my oem network. I had just a 15 and 2 uf cap in parallel.
  
  The coils are .27, .47 and .82 mH, same as factory (not sure if .47 vs .45 makes any difference). I assume the OEM ones I removed are the same values as the picture, but no way to know as they don't have the values labeled on them. I hear ya, the .27 and .45 OEM ones are air core, but for $26 CDN why not change them out. And I agree, the .45 in the top left looks rather small, but the wire is a thinner gauge, so it has more coils.
  - RE: You've already done the best thing you could do, IMO, by actively biamping. :) - Roger Gustavsson 00:57:15 12/29/22 (3)
    The 0.82 and 0.27 mH need to have a low reistance (DCR) in order to not modify the frequency response. The 0.47 mH is less critical.
    
    Magnepan seems to have chosen the third order low pass on the mid in order to reduce a peak higher up in the mid. The high pass on the ribbon tweeter is set rather low and streeses the ribbon a bit more than in some other models with the ribbon.
    - RE: You've already done the best thing you could do, IMO, by actively biamping. :) - watts 05:12:08 12/29/22 (2)
      youre knowledge of crossovers is better than mine. I don't know anything about checking the resistance of inductors; I assumed just getting the correct Henry value was sufficient?
      So here is the specs of the inductors I put in:
      0.43 ohms for .82 mH
      0.22 ohms for .27mH
      This is what Jeff at Sonic Craft suggested I get, I assume he knows what he is doing. Let me know if the values are fine, I do see they have lower resistance inductors available, but the prices get crazy for really low resistance .82 inductors.
      I have no issues redoing some things if I don't like what I hear, gives me something to do before golf season starts :)
      https://www.solen.ca/en/products/solen-perfect-lay-air-core- (Open in New Window)
      Edits: 12/29/22 12/29/22 12/29/22 12/29/22
      - RE: You've already done the best thing you could do, IMO, by actively biamping. :) - Roger Gustavsson 06:12:13 12/29/22 (1)
        
        In Reply to: RE: You've already done the best thing you could do, IMO, by actively biamping. :) posted by watts on December 29, 2022 at 05:12:08
        
        I was just a bit surprised that your aircore coils looked so small compared to the ones Magnepan installed. That could mean yours are having a higher resistance. The series resistance reduce the output of the midrange. If you liked the tonal balance of the original crossover and now use coils with higher resistances, it may sound a bit different.
        
        As Magnepan used an ironcored coil for the 0.82 mH-coil, I guess it has a low resistance, probably lower than your Solen coil. It is true tht aircored coils get expensive if you go for low resistance. That is also the reason to why Magnepan uses them frequently.
        
        If you like the sound of your 3.6 the way they are now - do nothing.
        
        RE: You've already done the best thing you could do, IMO, by actively biamping. :) - ketchup 19:41:01 01/13/23 (0)
        
        In Reply to: RE: You've already done the best thing you could do, IMO, by actively biamping. :) posted by Roger Gustavsson on December 29, 2022 at 06:12:13
        
        If you wanted to closely match DCR values, is it as easy as measuring the factory coil resistance with a multimeter and buying new coils close to the measured resistance?

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