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Stereo to Mono

Discussion in 'Electronic Basics' started by [email protected], Dec 15, 2007.

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  1. Guest

    Hello, I am in search of some help.

    I know the basics about sound and such, but none of the really
    technical stuff. I am looking to do something that seems almost
    impossible to me to do properly without messing anything up.

    I need to take two stereo line level signals, and turn them into two
    mono line level signals (or if that isn't possible one mono line level
    signal would work). I can buy or build anything, just need to know
    exactly what and how.

    This is why I need it:

    We have a very complex setup for our audio video system. We have 2
    seperat AV Recievers and over 18 pieces of equipment. We have over 15
    speakers in 8 rooms (7 in our main room, 2 in 2 others, and 1 in the
    rest).

    With our old reciever and our new reciever we can get signals to
    everything, and with the old reciever's bypass mode, it sounds right
    everywhere except in two rooms that each have a single speaker. We
    are feeding them from the Zone 2 preout's of the new reciever. This
    reciever does not have the option to make this output mono. We have a
    seperate stereo amplifier that powers each speaker.

    They need to be mono so that each room gets the full signal and not
    just one channel of a stereo signal.

    Any suggestions, tips, etc?

    Thanks in advance for any help you can give.
     
  2. Bob Masta

    Bob Masta Guest

    You can add 2 stereo signals together to get one
    mono signal, which you can then feed to two or more
    mono channels.

    You may be able to get away with a simple 'Y' connector
    to combine the stereo signals, but that depends upon
    their being a certain amount of output resistance in each
    stereo driver. Think of the case when one of the channels
    is momentarily at zero and the other is at peak: The channel
    at zero behaves like a ground connection, so if you just
    connect the two stereo outputs directly, the channel at
    peak is effectively shorted to ground. The only thing that
    limits its current is the output resistance of each channel.

    So, to play it safe, put equal-valued resistors in each output;
    anything from about 1k to 10k should be fine. Connect
    the free ends of the resistors together and use that point to feed
    your mono channel inputs. Connect all the shields together
    directly.

    Best regards,


    Bob Masta

    DAQARTA v3.50
    Data AcQuisition And Real-Time Analysis
    www.daqarta.com
    Scope, Spectrum, Spectrogram, FREE Signal Generator
    Science with your sound card!
     
  3. Guest

    This sounds good and like something that I can do, but I am not sure
    that I understand exactly how to make the cables and such. Is it
    possible for you to make or point me to a diagram of some sort of what
    it should be? thanks!
     
  4. Jitt

    Jitt Guest

    >,
    says...
    I dont remember the exact url, but if you google "esp
    westhost" you ought to find the site
     
  5. Guest

    I found this site. It looks like it might be right.

    http://sound.westhost.com/p-list.htm

    Do you happen to know what it was called? I cannot seem to quickly
    find it. Sorry to bother you again.
     
  6. Bob Masta

    Bob Masta Guest

    View in mono-spaced font:

    Right In --------- 2k--------.
    |
    Left In ----------2k--------o-------- Mono Out


    Right Gnd ----o----------------------- Mono Gnd
    |
    Left Gnd ----'

    As noted, the 2k resistors can be anything
    from 1k to 10k or so.

    Best regards,


    Bob Masta

    DAQARTA v3.50
    Data AcQuisition And Real-Time Analysis
    www.daqarta.com
    Scope, Spectrum, Spectrogram, FREE Signal Generator
    Science with your sound card!
     
  7. Guest

    Does it matter that in this small adapter the signal won't be shielded?
     
  8. Bob Masta

    Bob Masta Guest

    If you build this into a metal box, you can connect all the shields
    to the box. But you may be able to get by just fine without the box
    if your electrical environment is not too noisy.

    Best regards,



    Bob Masta

    DAQARTA v3.50
    Data AcQuisition And Real-Time Analysis
    www.daqarta.com
    Scope, Spectrum, Spectrogram, FREE Signal Generator
    Science with your sound card!
     
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