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Thread: resistance

  1. #1
    Forum Regular
    Join Date
    Dec 2002


    suppoase a driver is 8 ohms
    two of such drivers are are conected in parallel
    its give an 4 ohm load at the freqs they will play
    what if add a resistor of 4 ohms to this connection, the net resistance now will be 8

    now electrical gain will be 0db
    and acoustical gain will be 3 db rite??

    does it make sense
    does it make it easier for amp to drive the speakers

    second question
    if two drivers r connected is series is it possible to add a seperate LPF to one of them like say if there are two mids i want to stop one of them at relatively low freq than other
    if they r parallel than i can add diff values of cpacitors and inductors
    but if they r in series theres one xover so can i stop one earlier

    third question
    if two mid range drivers are connected in parallel, say 8 ohms which gives u 4 ohm
    now when one driver is called off earlier than other then resistance on rest of midrange freqs will be back to 8 ohms rite ??

    fourth question
    as mentioned in above when one driver stops working the resistance will be doubled and the amp will produce half power and there will be only one driver working at high frqs so net result will be -6db in that region, -3db electrical, -3db acoustical gain???

    these r few of my silly questions

  2. #2
    DIY Dude poneal's Avatar
    Join Date
    Sep 2003
    TX, USA
    Resistance is futile. :-)

  3. #3
    Forum Regular
    Join Date
    Dec 2002
    yes but doesnt it has a gr8 effect on the amp output ? ohms law?

  4. #4
    The Collector
    Join Date
    Sep 2003
    Springfield, MA
    when you half the impedence you get double the power (approximately) which inturn gives you a 3db increase. If you double the impedence you half the power (approximately) which will give you a 3db reduction.

    to answer question three first if you cross one over higher than the other the amp will still see the load through the whole spectrum at 4 ohms. frequency isn't a factor in impedence.

    ok second question in series you can use one crossover in the begining of the series to set the higher frequency then after that you can add another smaller crossover to lower the second in the series.

    first question if you have two 8ohm drivers in parallel you have 4 ohms, if you put a 4 ohm load resistor in series it will bring it back to 8ohms. if it is connected in parallel then you will have a 3.33 ohm load.

    fourth question frequency has no effect on the load. no matter what the driver is a load if it is playing those frequencies or not. the VC still has resistance. if one driver dies in a series connection then you lose everything, but if one coil goes open in a parallel connection then the load will be that of the one driver that is still functioning.

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