Whats the deal with the impedance on my paradigm titans??

Discussion in 'Archived Threads 2001-2004' started by Ryan T, Feb 26, 2002.

  1. Ryan T

    Ryan T Second Unit

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    Hi,

    I measured the impedance on my Paradigm Titans today and I'm concerned about the impedance. There supposed to be 8 Ohm speakers but the Digital Muiltimeter says there 3.9 to 4 ohms. Whats the deal? I always thought my H/K receiver runs a little hot. Now I'm worried that I might be over driving the Amp. Is there something wrong with my Titans? If anyone could help it would be appreciated.

    Ryan
     
  2. Patrick Sun

    Patrick Sun Moderator
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    Impedance is frequency dependent, plus what you are measuring is the Re ("DC resistance") of the total network at DC, not AC, which is where the nominal 8 ohm impedance rating of your speakers.
     
  3. Brian Fellmeth

    Brian Fellmeth Supporting Actor

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    Relax. What you measured was the DC resistance of the driver-crossover combo which is typically lower than the impedance load seen by the amp which is AC.
     
  4. Brian Fellmeth

    Brian Fellmeth Supporting Actor

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    oops, Patrick beat me to it.
     
  5. Ryan T

    Ryan T Second Unit

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    Phew, Thanks for the help. by the way is there some way to measure the AC impedance(If thats what it's called)? I'm still confused about the impedace with speakers. I have some car speakers and the are 4 ohms on my Multimeter. Since the Titans also say 4 Ohms can I run the car speakers with my reciever?

    Ryan
     
  6. Mark Krawiec

    Mark Krawiec Agent

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    the problem with ac impedance is that it varies as a function of frequency. it's not so much a single value as a graph.
    two speakers can have similar dc resistance yet have wildly different impedance vs frequency graphs and so the amp may have a difficult time with one, but not the other.
    there's not an easy way to tell without generating this graph. you end up needing a bit of testing equipment.
    or, conversely, you can use something like speakerworkshop to generate the curves.
     
  7. Steve Berger

    Steve Berger Supporting Actor

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    A quick look at Paradigm's website reveales the cause of your confusion on impedence. They are not 8 ohm speakers they are probably 6 ohm with a max wattage of 60 watts . I once traded emails with Cerwin-Vega for two weeks before they finally admitted that their "8 ohm compatible" speakers were in fact 6 ohm. Most amps need to have biasing set to 4 ohm when using these speaker impedences. While this doesn't mean instant death on an 8 ohm only amp, it does mean that extended use at high levels will overheat the amp and it could die. Also if you turn up a 100 watt amp to high levels you may damage the speakers. I had an old Pioneer 100 watt amp melt the voice coils on on some Advent "suitable for 20 to 100 watt amp" speakers. We opened them up and found the woofer marked 20 watts. I personally believe (pet peave) that anyone that doesn't list actual impedence and RMS wattage on their speaker to be deceiving you. BTW the simplest device to measure impedence fairly accurately is an LCR bridge.
     
  8. Ryan T

    Ryan T Second Unit

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    So the Titans are really 6 Ohm speaker. What would Paradigm have to gain from makeing there speakers 6 ohms not 8? Oh well I'm wanting to buy some new speakers anyway.

    Ryan
     

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