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4Ω vs. 2Ω

Discussion in 'Audio & Video' started by Casey05Taco, Sep 30, 2008.

  1. Sep 30, 2008 at 9:57 AM
    #1
    Casey05Taco

    Casey05Taco [OP] Well-Known Member

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    What exactly is the difference between Ω's?
     
  2. Sep 30, 2008 at 10:07 AM
    #2
    HerNameIsLucy

    HerNameIsLucy I miss Lucy. :-(

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    LOL after Mr. Marv spanked me in another thread I'll wait for his answer on this one along with ya!
     
  3. Sep 30, 2008 at 10:26 AM
    #3
    ANDYTACOMA

    ANDYTACOMA NOMAD

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    Ω=ohm
    ohm's measure resistance

    The mathematical equation that describes this relationship is:

    I = V/R

    where I is the current in amperes, V is the potential difference in volts,and R is a circuit parameter called the resistance (measured in ohms, also equivalent to volts per ampere).
     
  4. Sep 30, 2008 at 10:51 AM
    #4
    Chickenmunga

    Chickenmunga Nuggety

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    I think the OP is asking in reference to the speakers rather than "what is an ohm".

    I will take a quick stab at a generalized explanation to save Marv's fingers. This is my understanding, tear me apart if necessary:

    The ohm load of a speaker is important due to the resistance relationship between the amp and the speaker. A speaker with a lower ohm resistance will draw/can utilize more wattage from an amp.

    For instance, if I have an amp that is 1000 watts stable at 1 ohm, then I can wire up a sub with a 1ohm resistance and grab all that. If my sub has more resistance, say 2 ohm, then I would theoretically only be able to use 500 watts.

    This gets us into voice coils. All you really need to know is that it gives you more than one set of speaker terminals to clip on to. By wiring the speaker in parallel or series, you can change the resistance of the sub to better match the relationship to your amp. Speaking in terms of wattage, for a large amp and a small sub, it may be beneficial to increase the ohm resistance of the sub.

    Also note that the lower the resistance, the harder it is for the amp. That doesn't mean it's unsafe, it's just harder to achieve (read: a 1 ohm stable amp will cost more than an amp that's only 4 ohm stable).



    Back in the day I would go down the the stereo shop and the salesman would swoon over dual voice coils. They got real mad when I went with a cheaper 4ohm single. I've always kind of wondered if there's any benefit to that whole voice coil deal - if I have two single coil 4 ohm subs , is that the same deal as one dual coil sub at 2 ohms?
     
  5. Sep 30, 2008 at 10:53 AM
    #5
    Mr Marv

    Mr Marv 1-831-383-0308 Vendor

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    LOL myself on that one! :D

    That's the complicated answer direct from the book ;) and the hopefully easy to understand answer is generally speaking the lower the impedance the more power that speaker will pull from most amps (as long as the amp is stable at that impedance). You will typically see in amp specs that they will show power ratings at a certain loads ie 400 watts at 4 ohms or 800 watts at 2 ohms etc. Different voice coil configurations allow you to easier match speakers to amps so you can get the optimal performance from them.
     
  6. Sep 30, 2008 at 10:56 AM
    #6
    Mr Marv

    Mr Marv 1-831-383-0308 Vendor

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    You type faster than I do and nice job! I once got into a little debate with the manager at CC over the benefit of dual voice coils. His explanation was that they "sound better" if you wire one coil to each channel of a 2 channel amp in stereo! :eek: BTW, the actual major benefit of dual voice coils is to allow you more wiring options. :)
     
  7. Sep 30, 2008 at 11:01 AM
    #7
    Chickenmunga

    Chickenmunga Nuggety

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    Oh while we are talking about it, what's the deal with 6 ohm subs? I've never heard of an amp wanting 6 or 3 ohms..
     
  8. Sep 30, 2008 at 11:15 AM
    #8
    montgomery_30824

    montgomery_30824 Well-Known Member

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    so u can wire 3 of them in parallel to get a 2 ohm load. i have a jl box with 3 12 ohm 10's in it for a 4 ohm load.
     
  9. Sep 30, 2008 at 11:21 AM
    #9
    Mr Marv

    Mr Marv 1-831-383-0308 Vendor

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    There you have it! :)
     
  10. Sep 30, 2008 at 12:25 PM
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    Chickenmunga

    Chickenmunga Nuggety

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    3 subs be crazy talk, no wonder I didn't think about it. ;)

    Then again, someone tried selling me two 18"s for my Accord :rolleyes:
     
  11. Sep 30, 2008 at 1:00 PM
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    ANDYTACOMA

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    I guess i ass-u-me-d that the OP could understand some basic division but.. who knows thanks for dumb'n it down for us simple folk!
     
  12. Sep 30, 2008 at 1:49 PM
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    HerNameIsLucy

    HerNameIsLucy I miss Lucy. :-(

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    Now that wasn't needed. Marv knows his stuff and he's able to put it in non-tech speak. That's a good thing!
     
  13. Sep 30, 2008 at 7:55 PM
    #13
    atsaubrey

    atsaubrey Dealer/Sales Rep for Sundown Audio.

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    Keep in mind the lower your final impendence the more current draw of the amp, the hotter it will run, more stress on the amps so possiibly shorter life, and everytime you halve the impedence you also halve the dampening factor as well. Simple explanation of dampening factor: control over the speaker. Some of the "budget" amps I have seen and heard just sound "sloppy" at lower impedences because they "lose control" of the speaker. More power from lower impedences is seldom desirable from my experience especially when it causes things like more current draw than your capable of providing. my $.02
     
  14. Oct 1, 2008 at 5:01 AM
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    ANDYTACOMA

    ANDYTACOMA NOMAD

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    I apologize if what i said was offensive. I meant nothing demeaning by my statement, I was simply responding to this
    "That's the complicated answer direct from the book"
    Because as far as I'm concerned that is NOT a complicated answer, I was assuming that people would hopefully be able to read and complete simple arithmetic.:eek:
     
  15. Oct 1, 2008 at 6:56 AM
    #15
    lsocoee

    lsocoee My hair is all natural Moderator

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    nobody should take anything personal from Andy. He's an engineer. ;)

    Speaking of which, what's the difference between and introverted and extroverted engineer?




    The extroverted engineer looks at your shoes.
     
  16. Oct 1, 2008 at 7:18 AM
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    ANDYTACOMA

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    Oh my god it's a Sociologist

    uhh-ohh I've been discovered:eek:
    i would say im an "introverted" type
    ok i played along how about you?
     
  17. Oct 1, 2008 at 7:24 AM
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    montgomery_30824

    montgomery_30824 Well-Known Member

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    how did you get the ohm symbol on here? cant find that key on my keyboard anywhere?
     
  18. Oct 1, 2008 at 7:40 AM
    #18
    lsocoee

    lsocoee My hair is all natural Moderator

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    same way I can type this ♫

    Go to start, programs, accessories, system tools, character map and copy and paste away
     
  19. Oct 1, 2008 at 7:41 AM
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    montgomery_30824

    montgomery_30824 Well-Known Member

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    hey! no fair i dont have those keys!lol
     
  20. Oct 1, 2008 at 8:44 AM
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    Chickenmunga

    Chickenmunga Nuggety

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    Or you could do it the engineer's way and type ALT + 234 :)
     
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