Tweakers' Asylum

RE: Use Resistor to change speaker from 8 ohm to 4 ohm?

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Palustris

In Reply to: RE: Use Resistor to change speaker from 8 ohm to 4 ohm? posted by Joe Backer on July 16, 2022 at 08:03:59

Each of us has their own way of doing things and this is something I would never do.
Speakers are not a constant load. Their impedance changes relative to frequency. You don't mention the speaker, but there is a good chance the impedance does dip down to 4r at certain frequencies.

Edits: 07/16/22

Follow Ups:

RE: Use Resistor to change speaker from 8 ohm to 4 ohm? - Tre' 15:57:54 07/17/22 (4)
.
Have Fun and Enjoy the Music
"Still Working the Problem"
- RE: Use Resistor to change speaker from 8 ohm to 4 ohm? - Palustris 08:09:21 07/18/22 (1)
  That appears to be a very easy speaker to drive. I would simply hook them up and enjoy them!
  - Me Too. nt - Tre' 16:10:47 07/18/22 (0)
    .
    Have Fun and Enjoy the Music
    "Still Working the Problem"
- RE: Use Resistor to change speaker from 8 ohm to 4 ohm? - pictureguy 17:30:53 07/17/22 (1)
  Any particular reason?
  
  I think you'll need a resistor the same resitance as speaker impedance.....In this case, 8 ohms.
  
  You'll also need a power rating similar to the speakers actual usage....and a fudge factor.
  
  The power will be distributed about 50:50 between speaker and resistor.......which ultimately I suspect will run pretty HOT...
  Too much is never enough
  - RE: Use Resistor to change speaker from 8 ohm to 4 ohm? - Tre' 07:26:59 07/18/22 (0)
    The data sheet says the speaker is 15 ohms.
    
    To get a 4 ohm load from a 15 ohm speaker the parallel resistor needs to be 5.5 ohms. The resistor will suck up most of the power.
    
    That doesn't sound like anything I would do.
    
    Tre'
    
    Have Fun and Enjoy the Music
    "Still Working the Problem"

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