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Old 17th October 2008, 06:26 AM   #11
Rickets is offline Rickets  United States
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Default Stereo to Mono

I have joined this DIY because I was interested in the discussion going on about converting a stereo output into mono output.
I have a day care that has 4 rooms with one speaker in each room. One room gets the right channel on speaker "A", the other room gets the left channel on speaker "A", still yet, a third room gets the left on speaker "B", etc.
I want to put in a newer CD player/amp, but they only have a stereo speaker output terminal on the back for 1 set of stereo speakers. No pre outputs like on a component system.
I know just enough about Audio electronics to know that I don't have a spare can of smoke to recharge the amp if I just connected the outputs. I also know the Z must remain at 8 ohms. I read the previous posts that talk about low level dividers. Do you have any suggestions for a "speaker level" divider with 4 speaker switch system.
Regarding a HIGH level (or speaker level), will the circuit below work without the need for the can of smoke?
Or can you recommend a redesign of this for use with speaker out levels?

Speaker output -----+-----------\/\/\/\-----Disconnect Switch-------
AMP | R1 10K SPEAKER 1
--------------+------------------------------------------------------------
(shields) | |
| |
| +----------\/\/\/\------Disconnect Switch------- | | R2 10K SPEAKER 2
+------------------------------------------------------------
| |
| |
| +----------\/\/\/\------Disconnect Switch------- | | R3 10K SPEAKER 3
+------------------------------------------------------------
| |
| |
| +------------\/\/\/\----Disconnect Switch-------- | R4 10K SPEAKER 4
+-------------------------------------------------------------

I can build a robot, but I can't wire a speaker output!
I am also not smarter than a 5th grader either!!!

Thanks,
Rickets
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Old 17th December 2011, 05:38 PM   #12
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Neither of the links on the first page are accessible - when I click on them, the page simply says "403 Forbidden, you don't have permission to access (filename) on this server."

So far, this page is the ONLY lead I've found in being able to make a circuit that goes from stereo to summed, phased mono.
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Old 17th December 2011, 05:57 PM   #13
Twaksak is offline Twaksak  South Africa
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Dear MCRLAJ, what I would do is to put a mixer before the power amp. I don't know if this is what you are able to do but that would sort out all your problems. Then connect 2 speaker in series, the other two in series and then the 2x2 in parallel giving you 8 ohms speaker load.

Hope you will sort it out
Chris
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