Correct way to wire two 4ohm speakers to show 2ohms to amp.

Discussion in 'Home Theater Projects' started by Reginald Trent, May 17, 2003.

  1. Reginald Trent

    Reginald Trent Screenwriter

    Joined:
    Feb 18, 2000
    Messages:
    1,313
    Likes Received:
    0
    Can anyone help?
     
  2. Greg Monfort

    Greg Monfort Supporting Actor

    Joined:
    May 30, 2000
    Messages:
    884
    Likes Received:
    0
    Multiple resistances in parallel can be calculated with Rt = 1/(1/R1+1/R2, etc.,). Substituting 4ohms for R1 and R2 you get Rt = 2ohms, so wire them in parallel, i.e. jumper the two (+) together and the two (-) together.

    GM
     
  3. Reginald Trent

    Reginald Trent Screenwriter

    Joined:
    Feb 18, 2000
    Messages:
    1,313
    Likes Received:
    0
    Thanks Greg.
     
  4. Allen Ross

    Allen Ross Supporting Actor

    Joined:
    Sep 30, 2002
    Messages:
    819
    Likes Received:
    0
    i personally like to think of resistors in parallel as the product over the sum, so (R1*R2)/(R1+R2) works the same way except for 3 in parallel, but when does that ever happen? [​IMG]
     
  5. Greg Monfort

    Greg Monfort Supporting Actor

    Joined:
    May 30, 2000
    Messages:
    884
    Likes Received:
    0
    Pretty often for me back when I was freelance designing PA stacks and line arrays.

    GM
     
  6. Chris Tsutsui

    Chris Tsutsui Screenwriter

    Joined:
    Feb 1, 2002
    Messages:
    1,865
    Likes Received:
    0
    [​IMG]

    I guess the next question should be how to wire parallel.

    Do you connect one driver to the other, and then one of the drivers to the amp? Wouldn't this result in a marginal signal delay between drivers which may cause audiophile nightmares?

    Or do you connect both drivers to the amp. Or do you connect both wires together, and then connect the amp wire between the 2 wires connecting the drivers?

    I know there will probably not be a difference, but what if the length between the drivers was one mile... Then would there be a significant difference in parallel wiring? Just curious...
     
  7. Dan Wesnor

    Dan Wesnor Second Unit

    Joined:
    Apr 28, 1999
    Messages:
    389
    Likes Received:
    0
    The delay of a few extra feet of wire is much, much, much less than that of the manufacturing tolerances in typical drivers, caps, and coils. Don't worry about it.
     

Share This Page