Planar Speaker Asylum

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Planar Speaker Asylum

Mmmm, we seem to be at cross purposes :-(( ...

157.128.218.206

In Reply to: RE: As neo has stated, you *can't* passively biamp stock IIIas ... posted by rrob on August 09, 2010 at 17:55:07

So perhaps you could either draw a diagram, or explain how you are using your 2 amps.

Steve seems to think you are using an XO-1? (But I can't see where you mentioned this crucial fact?)

If you aren't and all you have behind each Maggie panel is the little external XO box which has wooden sides and a schematic engraved on the ss top ... then, as this only has 1 pair of input terminals, how are you connecting up the 2 amps?

Regards,

Andy

Follow Ups:

RE: Mmmm, we seem to be at cross purposes :-(( ... - rrob 19:53:19 08/09/10 (1)
I need another beer. It has wooden sides and ss top. Is this the crossover? It must be. I read the XO-1 operation on this box I have and the reference to "this box".............anyways. I must have just the crossover. sheeesh sorry for all the confusion but I am confused.
- No problem ... - andyr 20:07:34 08/09/10 (0)
  Yes, it sounds like you have the stock external IIIa XO boxes (which have wooden sides and a folded-over ss top with a schematic engraved on it).
  
  It should have only 2 speaker-wire connectors on the input? If so, just use this with one of your amps.
  
  Wires from the Bass '+' & '-' output terminals go to the Bass connectors on the aluminium back-plate; wires from the Mid/Tweeter '+' & '-' output terminals go to the Mid/Tweeter connectors on the back-plate.
  
  Regards,
  
  Andy
Seems there is no XO-1 in the setup - MaggiesAndCats 19:37:43 08/09/10 (3)
I believe rrob said in another part of this thread that he is going directly from the Threshold amp to the mid/tweeter section. The bass signal - all frequencies actually - are being fed to the mid/high section. Perhaps that is why the fuse on the mid section is blowing, although I would have expected the tweeter fuse to go also.

Steve
- RE: Seems there is no XO-1 in the setup - Davy 20:08:34 08/09/10 (2)
  Yes of course, this has been said several times by people in this thread, - and it could well be the main reason why the fuses are blowing. When you run these speakers as intended from one amplifier into the external crossover, the branch leaving the external crossover that runs to the internal crossover (the part that goes onto the mid and tweeter) is first filtered by the external crossover of low frequencies, which protects the mid/tweeter, - its obviously bad to feed that section a full range signal. I am not technical at all so can't explain why its bad but its qutie obvious to me that feeding that section a full range signal is a bad idea.
  I think if you ran the speakers properly, - as intended, with either one of your amps ONLY then the fuses would not blow. You need to stop running the speakers with two amps like this right now!!
  Of course too with active operation the branch going to the mid/treble section is also filtered of low frequencies by the active crossover, giving the same protection (as the external crossover does in passive configuration)I would have thought.
  I think you referred to the passive external crossover box of the IIIa (the metal box with wooden sides) as the XO-1. Obviously the XO-1 is very different, - its a much smaller black box.
  This is the MGIIIa speaker level external passive crossover box
  http://pic3.audiogon.com/i/c/f/1274753615.jpg
  and this is the line level XO1 passive crossover used for biamping these speakers
  http://pic3.audiogon.com/i/c/f/1278030066.jpg
  
  Cheers,
  Colin
  
  Edits: 08/09/10
  - Perhaps you're referring to the OP? - MaggiesAndCats 07:31:47 08/10/10 (1)
    "Yes of course, this has been said several times by people in this thread"
    
    Check the time of the messages.
    
    "I think you referred to the passive external crossover box of the IIIa (the metal box with wooden sides) as the XO-1. Obviously the XO-1 is very different, - its a much smaller black box."
    
    Nope, not me. THIS TIME I knew what I was talking about! :)
    
    Steve
    - RE: Perhaps you're referring to the OP? - Davy 07:52:09 08/10/10 (0)
      Hi Steve,
      Sorry for the confusion the message I posted appeared after yours, I was not referring to what you said!,-
      When I said: -
      
      "I think you referred to the passive external crossover box of the IIIa (the metal box with wooden sides) as the XO-1. Obviously the XO-1 is very different, - its a much smaller black box."
      
      I am indeed referring to the OP!
      Cheers,
      Colin

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