Help with Ohms equation

Discussion in 'Amps and Cabs' started by grantford, Jan 12, 2008.

  1. grantford

    grantford Member

    Messages:
    124
    Joined:
    Sep 6, 2006
    8ohms amp into 8ohms cab = perfect

    8ohms amp into 16ohms cab = ok

    8ohms amp into 16ohms hotplate into 8 ohms cab = ???

    heat and smoke? what will happen???

    THanks!
     
  2. rockon1

    rockon1 Member

    Messages:
    11,454
    Joined:
    Aug 12, 2005
    Location:
    Stamford CT
    Dont really know. I have read that an attenuator can be straining enough even when its matched properly. With a load mismatch it sounds like it would be dangerous. Bob
     
  3. xray

    xray Gold Supporting Member

    Messages:
    874
    Joined:
    Jan 6, 2002
    It should be fine. Lets say you are attenuated about half way to 8db or so. 50 % of your amps "sees" the 16 ohm load of the hotplate the other 50 % "sees" the correct 8 ohm load. Its never going to "see" more than 16 ohms and should be safe given that 16 ohms is safe to begin with.
     
  4. Ed DeGenaro

    Ed DeGenaro Supporting Member

    Messages:
    18,667
    Joined:
    Jan 3, 2002
    Location:
    Malibu
    8 into 16 into 8...fine
    8 into 8 into...fine
    8 into 4 into 8...not fine
     
  5. grantford

    grantford Member

    Messages:
    124
    Joined:
    Sep 6, 2006
    Thanks Ed (and others):AOK
     
  6. freaksho

    freaksho Member

    Messages:
    4,004
    Joined:
    May 4, 2007
    Location:
    The Capital
    fwiw, the THD Hotplate manual specifically states not to mismatch at all.
     
  7. trazan

    trazan Member

    Messages:
    807
    Joined:
    May 13, 2006
    Location:
    Norway
    Would any of these be preferred:

    4 into 8 into 4

    or

    8 into 8 into 4

    ?
     
  8. grantford

    grantford Member

    Messages:
    124
    Joined:
    Sep 6, 2006
    Yeah I saw that too. I do however trust Ed D. with his experience with THD.:BEER
     
  9. bluto0251

    bluto0251 Member

    Messages:
    191
    Joined:
    Aug 19, 2006
    Location:
    Santa Fe
    What about 4 into 8 into 8

    The 4 being a bandmaster reverb
     

Share This Page