The impedance of speakers and impedance of receiver

Discussion in 'General Electronics Chat' started by WardL, Jul 28, 2015.

  1. WardL

    Thread Starter New Member

    Jul 28, 2015
    4
    0
    Anyone knows if this scheme (http://www.intelix.com/media/tech_notes/152_Athena_how_to_wire_stereo_to_mono.pdf) would when applied directly on speaker cables?
    Because speakers itself have their impedance, and receiver expects a given impedance, so I assume I cannot just play around with some extra resistors?

    Situation is as follows: I have a single speaker cable (that I cannot replace with a double speaker, unfortunately) running from my receiver to another room. I am wondering if I would be able to send sort of a 'stereo mix' of both L/R channels on that single speaker cable?
    Any help appreciated.
    Additional information: speakers have impedance of 4Ohm.
     
  2. MikeML

    AAC Fanatic!

    Oct 2, 2009
    5,450
    1,066
    When listening to the mono speaker in the other room, are you also trying to preserve stereo in the first room? Or is it one-at-a time?
     
  3. WardL

    Thread Starter New Member

    Jul 28, 2015
    4
    0
    Well, my receiver (Marantz SR7009) supports multiple zone's.
    I want to use zone 1 for my living room (were I have stereo (an theoretically surround) speakers connected),
    and zone 2 for the other room (were I can only connect one speaker).
    So as I think the 2 zone's are actually 2 separate output channels in my receiver, I think you can consider it as 'one-at-a-time'.
     
  4. MikeML

    AAC Fanatic!

    Oct 2, 2009
    5,450
    1,066
    Can you obtain two each 2 to 4 Ohm, 20W power resistors?
     
  5. WardL

    Thread Starter New Member

    Jul 28, 2015
    4
    0
    I guess I could, I suppose I can find them in an electronics shop nearby, or otherwise, there is always the internet ;-)
    (to be clear you mean 2 resistors, with resistance between 2 and 4 ohm?)
     
  6. MikeML

    AAC Fanatic!

    Oct 2, 2009
    5,450
    1,066
    Yes, but capable of dissipating >20W
     
  7. WardL

    Thread Starter New Member

    Jul 28, 2015
    4
    0
  8. MikeML

    AAC Fanatic!

    Oct 2, 2009
    5,450
    1,066
    I looked at the receiver specs, and cannot tell how the speaker output terminals are driven inside the box. If the outputs are "bridged" (driven push-pull, like a car stereo), then my idea of bridging the two main channels will not work.
     
  9. KJ6EAD

    Senior Member

    Apr 30, 2011
    1,425
    363
    It's probably easier to use a separate monophonic amplifier for the single speaker and sum the two channels on it's input from the line level source, not the speaker outputs of the receiver.
     
  10. crutschow

    Expert

    Mar 14, 2008
    12,981
    3,221
    If the op checked between the two sets of outputs with an ohmmeter and found two with continuity, would that not indicate that the outputs are not bridged?
     
Loading...