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How can I connect two six volt stereo speakers to my car 12 volt supply. When I connect them in series across the 12v battery, only one speaker will work !

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  • ricketts_ton Jul 22, 2009

    The two stereo speakers have a builtin amplifier that normally operates from 6volts. I wish to connect the speakers to a 12volt supply. This connection is only for the amplifiers not for the speaker impedance !

  • ricketts_ton Jul 22, 2009

    My problem concerns the connection of the internal amplifier within each 6v speaker {not the speaker itself} the internal amplifier {s} within each speaker is 6 volts. I have a 12v supply from my car battery. When I connect the internal amplifiers in series, only one speaker will operate. My question is how can I connect the two speaker {amplifiers} to operate on the 12volt circuit.

  • ricketts_ton Jul 22, 2009

    The two speakers both have internal 6volt amplifiers. I am referring to the connection of these amplifiers within each speaker. I would like to know how to connect the 12volt circuit from my car battery, to enable the pair of 6volt amplifiers operate. The impedance of each speaker is entirely seperate from the amplifier circuit .

  • ricketts_ton Jul 22, 2009

    when I click "reply" and then "adda comment" then click "submit" the screen reverts back to solution number 2 ! Are you receiving my replies please .

  • ricketts_ton Jul 22, 2009

    I have two amplified speakers. Each speaker has a built in 6volt amplifier. I wish to connect the internal 6volt amplifiers of this pair of stereo speakers to a 12 volt supply. Can you supply a circuit diagram to enable the speakers to operate. The impedance of the actual speakers is not part of the circuit, I am only concerned with the supply to the amplifiers.

  • ricketts_ton Jul 22, 2009

    This is the best answer yet, but it still does not give me a proper answer! The link given for a dc to dc convertor is invalid ! If I connect each 6v amplifier in parrellel to the 12v battery this would give each amplifier the correct polarity, but of course too much voltage.
    Could someone recommend a resistor or transistor that I could wire in series with each amplifier to reduce the voltage going to each amp.

  • ricketts_ton Jul 22, 2009

    my problem is related to the amplifiers only built inside each speaker. The actual speaker is a completely seperate circuit. The speakers are designed to be connected to a portable CD player, and have 4 "C' CELL internal batteries. The batteries go flat very quickly, this is why I would like to use the facility to connect the speakers to an outside power supply. The speaker amplifier requires 6v. There are two speakers. I have a 12v supply from my car battery. If I connect the amplifiers in series ONE of them only will work OK. I think that if I connect them in parellel to the 12v battery this will give each amp the correct + and - but 12v instead of 6v. What I need to know is.....what {say} resistor can I put in series with each amplifier to reduce the voltage from 12v to 6v ?

  • ricketts_ton Jul 23, 2009

    Hi Heavymetal,
    Thanks for your reply which fits my request the best so far. Can you tell me just what to ask for at the electronics store. atahe transducer probably has a "value" ?


  • ricketts_ton Jul 23, 2009

    Now you know more about my problem, can you please give me your $4 solution.

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6 Answers

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Here is the item which you are required to purchase. Why you wan't to jumble your car with manual wire lying and resistence. You will have to get a soldering iron and a bread board to make your convertor yourself and its also not that easy that you will be able to make. You will require the circuit diagram of that converter first.
Below I've given you the item which you require to puchase for playing your spakers and more over alongwith just playing your speakers you can use it also as your phone charger playing your pocket CD player or whatever you wan't. Thats not too costly also.
12 Volts (10V-30V) in 1.5V, 3V, 4.5V, 6V, 7.5V, or 9V out Low Current DC/DC Converters 12 V to 1.5, 3, 4.5, 6, 7.5, or 9 V These inexpensive 24 watt DC-DC converters are useful for automotive applications

PST-DC292 How can I connect two - dc292_stamp.jpg

Posted on Jul 23, 2009

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  • Master
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Ok,I've read you posts. I'm not a complete audio expert but I have alot of electronics experience in the auto field in genral. So I think I understand what you're trying to accomplish. You want to connect them parralel so each would get 12v but you need to step it down to 6v. There's a few ways to do this, one research the resistors used on older dodge cars,known as the ballast resistor for the ignition coil. Some do step 12v to 6v but I forget which year or model. Any chrysler product will do,as long as it was designed to drop to 6v. The other way is to go to radio shack or equivelent & get a transducer or variable resistor to do the same thing. Hope this helps.

Posted on Jul 22, 2009

  • Pete MacSparran
    Pete MacSparran Jul 23, 2009

    No it would be a generic variable resistor. It should be marked for the 6v setting you need. Just turn the dial on it,should be a simple 2 wire connection,just splice it in for 2 speakers.

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  • Master
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If you are hooking two 6 volts up to one 12 volt, the power is splitted into the 2 speakers 6 volts in each. Otherwise you can replace the power supply as long as it has the same ohm rating as your speakers.

Posted on Jul 22, 2009

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  • Master
  • 336 Answers

Hi there,

You will need a step down down DC-DC (12V to 6V) converter for that. Unfortunately, it's very hard to find this in the market but if you have a good electronics foundation, you can build one. Here's one brand of the converter models. I hope it helps.

http://www.national.com/mpf/LM/LM338.htmlhttp://www.national.com/mpf/LM/LM338.html

Regards,
Jeep Brainy

Posted on Jul 22, 2009

  • jessy Jul 22, 2009

    Hi there,



    Apologies, looks like I've pasted the link twice, here is the correct one.



    http://www.national.com/mpf/LM/LM338.htm...



    Note that this regulator will only give you an output of 5amperes (6V) so check the current or power rating of your amplifiers. You may need one for each of the two amplifiers.



    Regarding a a resistor in series with your amplifier to reduce the voltage, I would not really recommend that since you don't know the supply line resistance of your amplifier. Also, you will be needing a very high wattage resistor to do that, take not that you battery is giving off 12 amperes so your resistor will really get hot and will die/blow in the long run.



    Regards,

    Jeep Brainy

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Speakers are never connected in series they are always connected in parallel, also speakers are rated in Ohms of impedance not volts

Posted on Jul 22, 2009

  • yadayada
    yadayada Jul 22, 2009

    SURE WOULD HAVE BEEN NICE IF YOU PROVIDED ALL THE INFO ABOUT THE SPEAKERS BEFORE I WASTED MY TIME AND YOURS ON THIS $4 PROBLEM.

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  • Master
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Hi Ricketts,

I strongly suggest you put a converter in between the unit and the power supply. this will even out the power and the ohms coming into the speakers. the reason why you only have one speaker working is that the speaker cannot sustain too much voltage into it.

http://www.powerstream.com/dc6-12.htm

hope this helps.

Regards,

voodoo

Posted on Jul 22, 2009

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