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Ohms?

Discussion in 'Amps and Cabs [BG]' started by Obsolex, Apr 2, 2003.


  1. Obsolex

    Obsolex Guest

    Nov 17, 2002
    Ok i know the meaning of ohms, 4ohms, 8ohms, ect... But what are they, like, is a 400 watt amp at 8 ohms, louder than an 800 watt amp at 4ohms? thanks, _-soto-_
     
  2. Turock

    Turock Supporting Member

    Apr 30, 2000
    Melnibone
    No.
     
  3. Obsolex

    Obsolex Guest

    Nov 17, 2002
    thanks, well that helps, lolz, _-soto-_
     
  4. Lockout

    Lockout

    Dec 24, 2002
    Illinois
    Yeah, Turock is right... a watt is a watt no matter what, basically.
     
  5. Obsolex

    Obsolex Guest

    Nov 17, 2002
    WHAT IS AN OHM! lolz, _-soto-_
     
  6. As the sun sets

    As the sun sets Guest

    Dec 10, 2002
    N. Easton, MA
    Yes, a watt is a watt.

    The higher the Ohm number, the more impedence the cab has. Meaning.. If you have an 800-watt amp, it will be louder if you run it into a 4-ohm cab rather than an 8-ohm. The 4-ohm cab has a lower impedence, meaning it lets the amp run more power into it. The 8-ohm has a higher impedence (hence the higher number), so it lets less power into it, meaning it's not as loud. Having two 8-ohm cabs is ideal in most cases because the impedence equals out to 4 Ohms. Anything lower than 4 Ohms can be kind of dangerous. 2 Ohms can work, but it's risky in my opinion. Again, a watt is a watt. It all depends on the impedence.
     
  7. Obsolex

    Obsolex Guest

    Nov 17, 2002
    thanks man, _-soto-_
     
  8. As the sun sets

    As the sun sets Guest

    Dec 10, 2002
    N. Easton, MA
    No problem. Hope that cleared some things up for you. Basically, impedence = resistance. Higher impedence/resistance = less volume.
     
  9. Petebass

    Petebass

    Dec 22, 2002
    QLD Australia
    Not really. Less Watts for sure, but the actual volume drop is barely noticable.

    Try this run a bass amp through a single 8 ohm cab. Then run it through the same cab but in a 4 ohm version. The volume benefit is barely noticable, you have however created more headroom in the amp.

    In reality most people go from 8 ohms to 4 by adding a second cab. The volume increase here is largely due to having twice as many speakers pushing air.

    The smallest volume jump the human ear can hear is 3db. To get an extra 3db, you have to double your watts. To Double your volume (10db), you need to multiply the watts by 10. Db is a logarithmic scale.