Closed Thread
Results 1 to 7 of 7

Reload Thread: What does Re: mean in ohm ratings? Please read

  1. #1
    ckunke002's Avatar
    ckunke002 is offline Senior VIP Member



    Join Date
    Oct 2011
    Location
    Clackamas, OR
    Posts
    491
    Post Thanks / Like
    Mentioned
    20 Post(s)

    What does Re: mean in ohm ratings? Please read

    I've noticed this in a few different places, and I'm on sundown's website right now.

    On the SA-12 subs, the specs look like this.

    D2 Model :
    Re: 4.57 ohms

    D4 Model :
    Re: 7.07 ohms

    This doesn't make any logical sense. I thought Ohms were only 1 whole number.. like 2 or 4 and such. Other website say that the D2 is 2 ohm dual coils and the d4 is 4 ohm, so why does the website say 4.57 and 7.07?







  2. #2
    ahole-ic's Avatar
    ahole-ic is offline Banned



    Join Date
    Jan 2010
    Location
    Ivory Tower
    Posts
    2,936
    Post Thanks / Like
    Mentioned
    0 Post(s)

    Re: What does Re: mean in ohm ratings? Please read

    Quote Originally Posted by ckunke002 View Post
    I've noticed this in a few different places, and I'm on sundown's website right now.

    On the SA-12 subs, the specs look like this.

    D2 Model :
    Re: 4.57 ohms

    D4 Model :
    Re: 7.07 ohms

    This doesn't make any logical sense. I thought Ohms were only 1 whole number.. like 2 or 4 and such. Other website say that the D2 is 2 ohm dual coils and the d4 is 4 ohm, so why does the website say 4.57 and 7.07?
    LOL. No. That is the resistance of the coil at rest in the gap. You are concerned with the impedence while at rest in the gap. Resistance and impedence do not have to be whole numbers. In fact if you were to accurately measure impedence (you can't. You don't have the proper tools to do so) you would see your coils are not dead on.




  3. #3
    kushy_dreams's Avatar
    kushy_dreams is offline The resident hippie



    Join Date
    Sep 2009
    Location
    twenty past four
    Posts
    4,091
    Post Thanks / Like
    Mentioned
    25 Post(s)

    Re: What does Re: mean in ohm ratings? Please read

    ITs because the subs have dual voice coils and they are usually wired in series for thiele small parameters. Divide those #s in half to get the reading for each coil.

    Voice coils almost never are a whole number. They will be a little more or a little less than what their nominal rating is, as you see above.



    13 Dodge Dart Rallye 1.4T


    http://mobileaudioforum.com/forum/forum.php<

    BOYCOTT SKAR AUDIO! SHADY BUSINESS PRACTICES SHOULD NEVER BE ENCOURAGED!

  4. #4
    ckunke002's Avatar
    ckunke002 is offline Senior VIP Member

    Threadstarter


    Join Date
    Oct 2011
    Location
    Clackamas, OR
    Posts
    491
    Post Thanks / Like
    Mentioned
    20 Post(s)

    Re: What does Re: mean in ohm ratings? Please read

    Quote Originally Posted by www.eCrack.net View Post
    LOL. No. That is the resistance of the coil at rest in the gap. You are concerned with the impedence while at rest in the gap. Resistance and impedence do not have to be whole numbers. In fact if you were to accurately measure impedence (you can't. You don't have the proper tools to do so) you would see your coils are not dead on.
    Ok.. so if I were to buy one of these and hook it up as a normal dual voice coil 2 or 4 ohm (depending on d2 or d4) everything would be fine?

    And why do they even give that info but not the normal impedance? I've also noticed this on many of these companies websites




  5. #5
    ahole-ic's Avatar
    ahole-ic is offline Banned



    Join Date
    Jan 2010
    Location
    Ivory Tower
    Posts
    2,936
    Post Thanks / Like
    Mentioned
    0 Post(s)

    Re: What does Re: mean in ohm ratings? Please read

    Quote Originally Posted by ckunke002 View Post
    Ok.. so if I were to buy one of these and hook it up as a normal dual voice coil 2 or 4 ohm (depending on d2 or d4) everything would be fine?

    And why do they even give that info but not the normal impedance? I've also noticed this on many of these companies websites
    The nominal is given when they say dual 2 or dual 4. You don't need to be any more precise than that. They give this out so when retards hook up their dmm's and read the coils and throw a fit they can refer them back to the specs.... since all of the "car audio experts" have no idea that there is a difference between impedence and resistance.




  6. #6
    Falcons's Avatar
    Falcons is offline that **** i dont like



    Join Date
    Jan 2011
    Location
    Albion, New York, United States
    Posts
    5,216
    Post Thanks / Like
    Mentioned
    19 Post(s)

    Re: What does Re: mean in ohm ratings? Please read

    in general i wouldnt even worry about this. unless if you want to know car audio inside and out, and know all of the science and math about it, then just look at the rms, the coil impedance, and your golden.



    Things to look forward to:
    (2) 10" or 12" imperium audio designs subs
    set of PHD MF 6.5" comps
    Completely seal off and deaden my doors
    aquire a 2k amp
    aquire a 2 channel amp for front stage

  7. #7
    ckunke002's Avatar
    ckunke002 is offline Senior VIP Member

    Threadstarter


    Join Date
    Oct 2011
    Location
    Clackamas, OR
    Posts
    491
    Post Thanks / Like
    Mentioned
    20 Post(s)

    Re: What does Re: mean in ohm ratings? Please read

    Quote Originally Posted by www.eCrack.net View Post
    The nominal is given when they say dual 2 or dual 4. You don't need to be any more precise than that. They give this out so when retards hook up their dmm's and read the coils and throw a fit they can refer them back to the specs.... since all of the "car audio experts" have no idea that there is a difference between impedence and resistance.
    Quote Originally Posted by falcons03079313 View Post
    in general i wouldnt even worry about this. unless if you want to know car audio inside and out, and know all of the science and math about it, then just look at the rms, the coil impedance, and your golden.
    Perfect.. thanks yall




Closed Thread

Similar Threads

  1. JL 300/2 "Low ohm" light: What does this mean?
    By FSUNole17 in forum Amplifiers
    Replies: 10
    Last Post: 06-09-2009, 01:31 PM
  2. what does this mean? please reply
    By pioneer_21 in forum Subwoofers
    Replies: 13
    Last Post: 12-09-2002, 11:26 PM
  3. Capacitors can "arc"? What does this mean?
    By 31337hxr in forum General Discussion
    Replies: 5
    Last Post: 05-03-2002, 08:08 PM
  4. Fuse requirement: 30A x 2...what does this mean?
    By 31337hxr in forum Amplifiers
    Replies: 1
    Last Post: 04-27-2002, 02:07 AM
  5. What does SPL mean?
    By C-Dawg in forum Amplifiers
    Replies: 1
    Last Post: 03-31-2002, 06:18 PM

Posting Permissions

  • You may not post new threads
  • You may post replies
  • You may post attachments
  • You may edit your posts

1e2 Forum