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whats the difference between 4 and 8 ohms?

Discussion in 'Amps and Cabs [BG]' started by iamthemusicman, Mar 5, 2003.

  1. if i had like a 500 watt head and i put the same head on to cabinets 1 was a 4 ohm and 1 was an 8 ohm cab. since it would run like 500 into into the 4 and like 250 into the 8 would the 4 ohm cab get louder? thanks
  2. geshel


    Oct 2, 2001
  3. BillyB_from_LZ

    BillyB_from_LZ Supporting Member

    Sep 7, 2000
    If the amp was rated 500 watts into 2.67 ohms (the resulting impedance from a parallel connection of 4 and 8 ohms), the 4 ohm cab would get about 335 watts and the 8 ohm cabinet would get the rest (about 165).

    Their relative loudnesses is based on their efficiencies...if the 4 ohm cab was an Acme and the 8 ohm cab was something else, the 8 ohm cabinet might actually be louder. If the cabinets were identical other than impedance, the 4 ohm cabinet would technically be slightly louder, but not much.