Planar Speaker Asylum

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RE: 1.6QR Inductor

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In Reply to: RE: 1.6QR Inductor posted by RickeyM on September 18, 2010 at 06:54:06

I don't understand.
The STOCK value for the inductor is 3.5mh at 0.4ohm DCR. It is also 16ga.
I'll look again at the referenced inductor.

Don't forget, better caps can get pretty BIG. Look at the dimensions of any caps on your short list for upgrade. You'll need to relocate the entire crossover.

I like the idea of doing the tweeter end first.
Too much is never enough

Follow Ups:

RE: 1.6QR Inductor - RickeyM 05:52:16 09/19/10 (1)
Never seen or measured the inductors in the MG1.6. If they do indeed have a DCR of 0.4-ohm, I'd leave 'em alone. Better off replacing the internal wiring/binding posts, and fuse holder if you're not going fuseless.

AS far as mounting crossover caps, in the tweaks section I've seen some interesting ideas. One of which was to mount a plexi panel over the x-o section and mount the caps externally to that.

FWIW, I bought some caps marketed as PIO's from a seller on eBay. The 10uF & 20uF sizes are pretty small compared to other caps of the same values. I use the 10uF size as output coupling caps on my CDP and they sound VERY good. I'm going to give these caps a try in the crossovers of my 2.5's later today and report back on the results.

AS pictureguy said, come up with a plan. There is a good amount of info on 1.6 x-over upgrades in the Tweaks section. Take a look.
- RE: 1.6QR Inductor - pictureguy 08:25:56 09/19/10 (0)
  Magnepan schematic says 0.4 ohms DCR. Just my personal opin, and since I'm not a qualified redesign guy, I'll stick as close to standard values as possible while trying to go UP the quality ladder.
  To that end, I'll abandon the iron inductor which uses 16ga. (?) wire and replace it with a longer bit of 13 or 14 in an air core. Design goal is to stay as close to 0.4 ohms as possible.
  Aircore won't fit in the panel, either. It is quite a bit larger than the standard part.
  
  IF....big IF, anyone is interested I'll send off my measurements and the 'secret' to the correct size. The unit I have designed, using online help calculators, is about 4" in diameter and an inch thick. It has equal number of layers to the coil as it does wires per layer. this means the coil is 'square' in cross section which is the theoretical 'perfect' coil...pretty much the minimum cross sectional area.
  
  From a strictly visual point, a nice handmade wooden box is the way for me to re package a crossover. It would appear that better caps also take up more space. The Clarity SA which I am targeting are pretty darn big. You could Never cram them in where the stocks parts went.
  
  2 stages to a project like this.
  First is mechanical. New frames / supports and a crossover box.
  Second is to redo the crossover and wiring.
  
  Fini
  
  Too much is never enough
RE: 1.6QR Inductor - pictureguy 09:14:57 09/18/10 (2)
Yep, the DCR is very low.
I'd still go to drawing board and calculate an aircore and keep messing with the numbers until I get something close to stock DCR.,
Too much is never enough
- RE: 1.6QR Inductor - Lynxo 11:42:49 09/18/10 (1)
  Thanks for all your great tips and suggestion. especially the lower resistance and to use a lower value inductor.
  
  I'll have to decide to keep it internal, find parts that fit or external and have the flexibility to use better part.
  - RE: 1.6QR Inductor - pictureguy 13:45:47 09/18/10 (0)
    ME? I'll go back to thread and see if I gave that impression.
    Somebody else recommended lower DCR and higher capacitance to maintain crossover frequency.
    
    I'm a big fan of trying to optimize the STOCK design before making big changes, not to say the other approach won't work. I would be beyond my confidence level making electronic changes without understanding them better>
    
    Too much is never enough

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