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.

 

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?

 

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'.

 

Can you obtain two each 2 to 4 Ohm, 20W power resistors?

 

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?)

 

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?)

Yes, but capable of dissipating >20W

 

For example, I found this one:
http://www.gotron.be/en/componenten...5-2-2-ohm-1.html?___store=en&___from_store=nl

Are you saying I could apply the above scheme by making use of 2 of such resistors? Or are you thinking of another scheme?

 

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.

 

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.

 

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.

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?