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RE: RF choke tweak for MMG series crossover

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In Reply to: RE: RF choke tweak for MMG series crossover posted by RickeyM on July 27, 2010 at 05:33:17

I know a few here have pulled the resistor out of their PG crossover, or substituted it with a lower valve. I'm not ready to make that decision yet, until the room treatments are done.

And that you can have both resistor and choke in the same circuit, although not sure if they should be wired in parallel or series, or if that matters either. Guess I'll find out when I get there. Thanks

Follow Ups:

Wire the choke in series with the resistor. - Al Sekela 15:30:06 07/27/10 (2)
It will shunt the resistor in the audio band if you wire it in parallel. The choke's DC resistance is almost zero.
- RE: Wire the choke in series with the resistor. - johnvb 16:53:39 07/27/10 (1)
  Thanks Al. If I decide to go the full sandbox route, is it OK to bury these with the rest?
  - Yes, that would be the better approach. - Al Sekela 15:47:39 07/28/10 (0)
    Acoustic vibration of the choke would generate audio-band noise. The amp should reject it, but there is always the gap between theory and reality.
RE: RF choke tweak for MMG series crossover - neolith 06:07:37 07/27/10 (4)
The choke needs to be in series with the tweeter (as does the attenuator resistor). The easiest thing to do is to insert the choke between one of the input terminals and the wire(s) that are currently attached there now. Because this is a series xo, it doesn't matter if you attach the choke to the positive or negative input terminal.
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I plan to procrastinate my demise for as long as possible. In the meantime, I practice by putting off all the little stuff.
- RE: RF choke tweak for MMG series crossover - johnvb 06:21:52 07/27/10 (3)
  I plan on slapping it on the breadboard, which in turn will be inside an external box (this is the temp. version).
  - RE: RF choke tweak for MMG series crossover - Showme 08:29:29 07/27/10 (2)
    I don't see your Duelund 1.5ohm. PG had without it at one point, then added it. What lower value have others used.
    
    Edits: 07/27/10
    - RE: RF choke tweak for MMG series crossover - johnvb 08:39:10 07/27/10 (1)
      It's on the very left hand bottom corner, kinda blends in with the pegboard.
      - oops! /nt - Showme 10:19:35 07/27/10 (0)
        
        In Reply to: RE: RF choke tweak for MMG series crossover posted by johnvb on July 27, 2010 at 08:39:10
        
        .
RE: RF choke tweak for MMG series crossover - RickeyM 06:07:28 07/27/10 (2)
Removing or changing the value of that resistor will change the crossover point of the tweeter. It's not a huge change, but it will alter it slightly. You are free to experiment on your own. You may find that you like a slight alteration in your set-up. This goes for the choke too, see which way YOU like it.
- RE: RF choke tweak for MMG series crossover - johnvb 06:57:52 07/27/10 (1)
  One more Rick. I noticed on some pics you posted that when you had your MMGs, you had the pole pieces back. Was this with the series x-over, and did you start out with them reversed?
  
  I set my frames up so that I can easily go either way, at least until I sock em.
  - RE: RF choke tweak for MMG series crossover - RickeyM 11:47:34 07/27/10 (0)
    If the pole pieces were "back", I don't think I was using the series x-over. There may be a pic out there where I simply reversed the speakers and temp hooked up the series x-o's. I honestly don't remember.
    Once I made the wood frames, the pole pieces were in front and the series x-over was in use.

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