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Stupid question about impedence?????????

Discussion in 'Home Cinema Speakers' started by matblack, Aug 5, 2003.

  1. matblack

    matblack
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    Hi Guys

    Need some help because I am really struggling to get my head around the impedenece of my speakers and if they will work together properly.

    I have a new Marantz SR4200 and the following speakers

    Kef Q30 fronts 6ohms
    Kef 70S rears 6ohms
    Kef Q95C centre 4ohms

    (all figures lifted from the Kef site)

    What I really need to know is can I just cable these up to the Marantz, set up the speaker sizes in the menu and let rip or have I made a fundamental error getting speakers which don't have matched impedences?

    The Marantz 'says' it outputs 70W @ 8ohms but it seemed to handle the Q30's OK when I tested i just with them, I hope that bodes well!

    Any advice gratefully recieved

    Matt
     
  2. Mylo

    Mylo
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    I have the same amp. 6 ohm is compatable. Not sure if it was on the amp or in the manual, but is does say 6 ohm is ok.:)
     
  3. matblack

    matblack
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    Thanks Mylo

    Thats the fronts and rears taken care of, anyone know about the 4ohm centre?

    Matt
     
  4. stranger

    stranger
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    speakers ohms ratings are nominal, your amp shouldn't have any problems.
     
  5. matblack

    matblack
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    Thanks Stranger

    I've heard a lot of talk about ohms, some say is matters some say don't worry about it. Most people say its ok to go to 4 ohms with a decent amp but not with a cheap one, so I was getting very confussed.

    I think when the centre comes I will just nail it all together and see what happens!
     
  6. stranger

    stranger
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    you're right to check and it certainly isn't a stupid question-ohms ratings are one of the most confusing figures in a/v.
    in your case Marantz like Denon give conservative power ratings for their amps-a cheap Sherwood or the like would probably struggle.
     
  7. matblack

    matblack
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    Cool

    The majority of the speakers are 6 ohm which isn't too far out and just the centre is 4 ohms, so hopefully the amp shouldn't be under too much stress! Last thing I need in my front room in this weather is a new radiator!!!!

    Matt
     
  8. matblack

    matblack
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    Sorry to be a pain

    Will I need to adjust the balance to the centre speaker to compensate for the different impedence, will the difference mean that the sound is quieter if it is driven at the same level as the other speakers or is that down to something completely different?

    Can you tell I'm new to this? :)

    Matt
     
  9. Reiner

    Reiner
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    The impedance alone does not say how loud the speaker will be, but the lower the more load to the amp.
    The sensitivity (measured in dB) will basically define, how load a speaker goes at a given input signal. The higher the number the better.
    In any case you should balance the volume levels of all channels and by that you can compensate for any differences.
     

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