Free Shipping on All Orders 1-866-764-1801

Vist our Online Store
+ Reply to Thread
Results 1 to 5 of 5
  1. #1

    Member Sales Rating: (2)

    Join Date
    Oct 2005
    Location
    College Park, MD
    Posts
    843

    Default To put your speaker ohm rating in perspective....

    I made several home made speakers the last week with varying coils of wire (Some very short) and some long... the most basic was about 20 coils of 36 gauge wire around a soda cap. I plugged that into my Outlaw RR2150 and held it over a very large magnet. It worked. what is the resistance of the coil? like 0.01 Ohms. Over the magnet? Like 0.1 ohms. Did it work? Yes. Did the wire melt the tape around it? Sure, 36 gauge wire gets very hot very quickly.

    More importantly -- the amp was fine. Resistance of your speakers vary a ton. As long as your sound is OK that means the current draw isn't being maxed out and your amp will be fine, even if you plug in a coat hanger. Just take it easy on the volume till you have tried things with broad dynamics.
    My Iron Man training/charity blog.

    HT:
    32" Sharp LCD. H/K dpr 1001 to Outlaw Audio 7900 to Polk LSi + Paradigm Studio center. Hsu DualDrive ULS-15. PS3/Wii. Outlaw 7900.

  2. #2

    Member Sales Rating: (2)

    Join Date
    Jun 2004
    Location
    New England
    Posts
    8,320

    Default

    You made a choke (coil); the inductance/AC impedance will be more of a factor than its DC resistance in terms of the way it loads an amplifier output.
    all the best,
    mrh

  3. #3

    Member Sales Rating: (2)

    Join Date
    Oct 2005
    Location
    College Park, MD
    Posts
    843

    Default

    for sure, but the point is not to get so worked up about the nominal rating on your speaker.
    My Iron Man training/charity blog.

    HT:
    32" Sharp LCD. H/K dpr 1001 to Outlaw Audio 7900 to Polk LSi + Paradigm Studio center. Hsu DualDrive ULS-15. PS3/Wii. Outlaw 7900.

  4. #4

    Member Sales Rating: (3)

    Join Date
    Oct 2004
    Location
    Mid-Michigan
    Posts
    3,579

    Default

    The thing is though is you are measuring resistance. The impedance is what you need to be looking for. The resistance of a speaker is usually lower than the impedance. The DC resistance means nothing to the AC signal that is coming in.
    Speakers:SDA2a, sub:Atlantic Technologies 172 PBM
    Pre:B&K PRO-10MC(2ch)
    Amps:Parasound HCA 1000a
    SourcesOppo DV-970HD, Xbox360, Kenwood KT-5300
    Cables:Philips/RCA/Monster

    Life's short, Listen to SDA's
    Life is short live Sui Juris
    Where did SOPA go?

  5. #5

    Member Sales Rating: (0)

    Join Date
    Mar 2009
    Location
    Inside the Matrix
    Posts
    694

    Default

    While I personally oft use speaker impedance as an analog to wire resistance (impedance) for practical day to day stuff, as dudeinaroom states, AC currents complicates it a great bit. Within speakers, the specific frequency being reproduced by the speaker will vary its impedance quite a bit.

    For example, some frequencies will drive a nominal 8 ohm speaker down to under four ohms. For other speakers, less. If, by chance, the ohm rating in any speaker is reduced to 0 ohms, you have a dead end short and the required current to be delivered goes to infinity.

    Many bad things happen to power delivery equipment when there are dead shorts. Be it your amp or the local power station. At a minimum, fuses or breakers blow as they are all rated upon current delivery capability. If they do not work to expectation, then something else within the overall circuit becomes the "fuse...." I do not want said fuse in the circuit to be a circuit within my amp.
    Last edited by Hillbilly61; 04-11-2010 at 03:50 PM.

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

     

Similar Threads

  1. Speaker power rating
    By ls7z06 in forum Speakers
    Replies: 10
    Last Post: 09-29-2009, 11:27 AM
  2. Speaker Rating & Bi-Amping - a question
    By Gadabout in forum 2 Channel Audio
    Replies: 1
    Last Post: 01-04-2009, 02:18 AM
  3. Some perspective...
    By Jstas in forum The Clubhouse
    Replies: 6
    Last Post: 07-12-2008, 02:19 AM
  4. Question about Wattage/Speaker rating
    By gordonf238 in forum Electronics
    Replies: 16
    Last Post: 06-16-2005, 03:23 PM
  5. Speaker wattage rating. Advice Please.
    By pcgorilla in forum Speakers
    Replies: 32
    Last Post: 04-22-2003, 07:45 PM

Posting Permissions

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