Tri-way impedance

sirogenous
sirogenous Posts: 57
edited October 2001 in Technical/Setup
If there is one 4 ohm speaker attached to each left and right channel of the amplifier, and one 4 or 8 ohm speaker wired inbetween the left and right channels of the amplifier (third speakers + pos. to amps. left channel + pos. and third speakers - neg. to amps. right channel - neg.) What would the resistance be for each channel.
Post edited by sirogenous on
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  • sgtgto
    sgtgto Posts: 310
    edited October 2001
    Hi:

    I used to have a Fisher amp that had a center channel wired that way. I bought it in 1966. I don't believe it would affect the resistance of either the right or left channel since you are not going across either channel. There would possibly be some signal loss. What you would get out of the middle would be a monaural mix of the right and left channel.

    What are you trying to do?


    Gary
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  • sirogenous
    sirogenous Posts: 57
    edited October 2001
    Hello Gary,
    First off, thank you for replying to my post. I don't believe that you understand the idea that I am trying to get across. However, I realize that my explaination may be somewhat confusing or at the very least is difficult to understand. So I'll make another attempt at it.
    For instance: I have a (2) channel amplifier with (1) 4 ohm speaker attached to the amplifiers left channel and (1) 4 ohm speaker attached to the amplifiers right channel. Now if I take another speaker, say (1) 8 ohm speaker. And I attach this 8 ohm speaker inbetween the left and right channels of the amplifier. The amplifier already has the (2) 4 ohm speakers attached to it. Now, I connect the 8 ohm speakers positive to the positive lead of the amplifiers left channel and the 8 ohm speakers negitive to the amplifiers right channel negitive lead. What would the resistance be on each channel of the amplifier.

    ( Remember, the amplifier still has the (2) 4 ohm speakers attached to both left and right channels) In otherwords, there are (3) speakers total, with both the 4 ohm left and right channels sharing the one 8 ohm speaker across them.
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  • sgtgto
    sgtgto Posts: 310
    edited October 2001
    Hi:

    Answers the same. I do understand what you want to do, and I don't believe the resistance would change for your left or right channel. You would have to connect another speaker, in series or parallel, across one of the channels to change the resistance.

    Be careful in doing this some amps wouldn't like it.


    Gary
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  • sirogenous
    sirogenous Posts: 57
    edited October 2001
    Hello Gary,
    I wasn't sure if you understood my question. However, it is becoming more clear that perhaps I am the one who doesn't understand. So, what is the load that the amplifier sees. Does it stay at 4 ohms per. channel. Or does the load change to that where the amplifier views the load as one single load instead of two 4 ohm loads. The reason why I am so curious about this type of setup is it is shown in the owners manual of my Sony car amplifier as a possible way of attaching speakers to it. However, it does not tell what what the impedence of the additional speaker should be. et. 4, 6 or 8 ohms nor does it say whether or not the additional speakers impedence even matters. It only shows the speaker being used with a low pass filter and high pass filters on the left and right speakers. Creating a subwoofer out of the 3rd speaker.
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  • RuSsMaN
    RuSsMaN Posts: 17,987
    edited October 2001
    ...its a Sony 3/2/1 channel amp. You are running 2 channels for the main left and right, third is bridged for a sub. Do it.

    I was thinking home amp, which would be a no-no....

    R
    Check your lips at the door woman. Shake your hips like battleships. Yeah, all the white girls trip when I sing at Sunday service.
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  • sirogenous
    sirogenous Posts: 57
    edited October 2001
    Exactly, that is if a two channel amp is considered to be a three channel amp if the left and right channel can be bridged. It should be safe to do since the amp is stable down to 1 and 2 ohm loads depending upon which "mode" the amplifier is in. ("High Voltage" mode for more dynamic headroom and "High Current" mode for use with very large and power hungery subwoofers) I don't know why it just didn't explain the entire setup by simply stating that I wanted to bridge the left and right channels with a single subwoofer. What would the impedence be? Once more though, I'm not sure if the question even applies set up such as this.
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