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Yes - the black box

74.79.45.250

MaggiesAndCats

In Reply to: RE: Am I missing something? posted by rrob on August 09, 2010 at 19:35:53

Well, that's one mystery solved - I think. What you are referring to is what the rest of us have been calling the external crossover boxes. That is what it is called in the MGIII manual also. They are metal with wood sides, correct? It has 1 set of inputs and 2 sets of outputs, 1 set for bass and 1 set for mid/tweeter. The instructions on top of the external crossover boxes do not match the MGIII manual, or the XO-1 manual. (Maybe they're left over from when they were used with the Tympanis?) The XO-1 being refered to is a black box that goes between your preamp and the power amps:

|-{treble power amp}-{speaker mid/hi}
{Pre}-{XO-1}-
|-{bass power amp}-{external crossover box}-{speaker bass}

The above diagram should show the ouputs from the XO-1 going to the power amps.

Anyhoo... I need to catch some shut eye (*yawn*) but I might be able to post the XO-1 manual tomorrow. I have 2 black box XO-1's gathering dust. If you need one you can have it for the cost of shipping.

Regards,

Steve

Follow Ups:

RE: Yes - the black box - rrob 20:16:55 08/09/10 (6)
I need to digest for awhile and also understand what the XO-1 does. I think the biggest problem I have is an amp with DC output. It's disappointing because I thought I was avoiding that. Regardless of which crossover I choose for bi-amping I will have to filter out the DC.

Thanks for the offer Steve. You're using Behringer. Andy is using an Elliot design and Neo has Marchand. I don't think any have provisions to filter out DC. I will have to do that as Neo suggested.

Thanks Neo, Davy and Andy for your responses. And again, sorry for the confusion.
- Amp with DC output - neolith 20:31:03 08/09/10 (5)
  Rrob, your amp may not have a DC offset but in undervoltage situations (turn on and turn off) a DC spike may be generated. This DC goes away when the amp stabilizes. You may not experience the DC spike when you warm up your amp with no load, shut down and reconnect and turn on again because the power supply caps haven't fully discharged.
  �
  
  I plan to procrastinate my demise for as long as possible. In the meantime, I practice by putting off all the little stuff.
  - RE: Amp with DC output - rrob 20:38:43 08/09/10 (4)
    Neo, does that mean disconnect speaker cables, power up the amp and allow to warm up, shut down amp, connect speaker cables, restart amp?
    
    How dangerous is connecting the speaker cables with the amp on?
    
    Randy
    - DO NOT DO IT! - neolith 18:46:38 08/10/10 (3)
      I guarantee that you will do it correctly 99 times and then accidently short the amp and watch it go up in smoke. ALWAYS make and break the connections with the amplifier off. A safer approach would be to remove the fuse, turn the amp on and let it settle down and then insert the fuse, but I really don't recommend that either.
      �
      
      I plan to procrastinate my demise for as long as possible. In the meantime, I practice by putting off all the little stuff.
      - RE: DO NOT DO IT! - rrob 18:51:31 08/10/10 (2)
        
        In Reply to: RE: DO NOT DO IT! posted by neolith on August 10, 2010 at 18:46:38
        
        Thanks Neo. I've seen it done in audio shops from time to time but always thought it was a bad idea.
        
        It depends if your amps are designed to be able to cope with a short ... or not! :-)) nt - andyr 03:22:20 08/11/10 (1)
        
        In Reply to: RE: DO NOT DO IT! posted by rrob on August 10, 2010 at 18:51:31
        
        .
        
        RE: It depends if your amps are designed to be able to cope with a short ... or not! :-)) nt - pictureguy 09:52:27 08/12/10 (0)
        
        In Reply to: RE: It depends if your amps are designed to be able to cope with a short ... or not! :-)) nt posted by andyr on August 11, 2010 at 03:22:20
        
        You could build a circuit with a time delay relay. When it sees power, it waits a few seconds before closing the contacts and connecting the speaker to the outputs.
        I have no idea how much $$$ a proper relay would be, but the DC turnon 'thump' is bad for the speaker, in the long run.
        Too much is never enough
You do have 2 of the external crossover boxes, right? One for each speaker? *nt* - MaggiesAndCats 20:03:50 08/09/10 (0)
NT

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