Cabinet impedance question

Discussion in 'Amps and Cabs [BG]' started by soaf, Jan 1, 2015.

  1. soaf


    Jul 27, 2013
    I am converting a Sunn model 2 PA enclosure to a 2x10 bass cab and want to add a Peavey triflex tweeter (8-ohms, 1.5 kHz-15kHz Hz). I am looking at an Eminence high pass filter which is 8-ohms. My two tens are 8 ohms each, making the cab currently 4 ohms without the tweeter or high pass filter. When I add the 8-ohm tweeter with the 8-ohm high pass filter, will it alter the impedance of my cab? What will the total impedance be? Thanks.
    Last edited: Jan 1, 2015
  2. BassmanPaul

    BassmanPaul Inactive

    For the love of all that's holy the word is impedance!!! Adding a tweeter with its filter does not change the total impedance of the enclosure.
    B-string likes this.
  3. Well, the hope for 2015 didn't last long.......

    Paul has your answers above ^
  4. Because I think it might be helpful to someone who doesn't necessarily comb through posts every day, if you didn't know, the histrionics in the initial response was over your use of the word "ohmage." There are a number of active posters who oppose its use…it bugs them. Although "ohmage" is a word that can be used to express ohmic value (i.e., where saying "the impedance is 8 ohms" is the same as saying "the ohmage is 8"), many of these ohmage deniers say that it's not even a real word. Several of them have lamented that, due to falling intellectual standards and general decline in society, they fear the word ohmage may appear in future dictionaries as further bastardization of language (which is a rather curious thing, because it's currently in dictionaries and has been for some time…but that's neither here nor there).

    I suppose an ohmage purist might say that, even though impedance is the concept of resistance as applied to AC, and they are both expressed in ohms, that ohmage only applies to electrical resistance. I haven't seen anyone argue that point though.

    Either way, probably best to conform and stop using the word ohmage.
  5. If you use the wrong ohmage crossover, your crossover frequency will be all wrong.
  6. The frequemage will be wrong.
    DiabolusInMusic likes this.
  7. BassmanPaul

    BassmanPaul Inactive

    Not histrionics just a desire to educate our fellow bassists. The fact that "ohmage" is now in dictionaries makes no matter so is selfie. Neither is the correct word to describe the impedance of a loudspeaker.
  8. When I saw the title to this thread I knew it would deliver. OP, you want a crossover not a high-pass filter.
  9. Exclaiming "For the love of all that's holy," in this case, is histrionics.
    bolophonic likes this.
  10. BassmanPaul

    BassmanPaul Inactive

    What ever you say Dr Paper! :D
  11. I think I still have a welt on the back of my hand for using the "word" 'aint'. It is in the dictionary now, I use it as a joke and to feel the tingle in my hand.
  12. soaf


    Jul 27, 2013
    No... I definitely want a high pass filter, not a crossover. I want the speakers to remain full-range.
  13. soaf


    Jul 27, 2013
    So what impedance high pass filter should I be using?
  14. El Spearo

    El Spearo

    Jun 12, 2012
    Wellington, NZ
    B-string likes this.
  15. The impedance of the tweeter horn is the determination. Filters will be listed for crossover frequency at _ _ ohms (the impedance of the driver).
  16. seamonkey


    Aug 6, 2004
  17. Zooberwerx

    Zooberwerx Gold Supporting Member

    Dec 21, 2002
    Virginia Beach, VA
    I thought histrionics were the guts of an amphlifier. You know: solid status vs tubular.

    BassmanPaul likes this.
  18. dincz


    Sep 25, 2010
    Czech Republic
    Please let it be so! I have a dual-"ohmage" cab - Nominal impedance 8 ohms, DC resistance 6 ohms (and inchage of 15"). Why the resistance to getting it right? It just impedes understanding?

    PS. If asked for MY inchage, should I say 68, 32 or 6?
    Last edited: Jan 2, 2015
  19. I can't understand why someone would purposefully exclude that which is unholy from love.
  20. After the OP has edited his subject and post content, what purpose does it serve to go on and on about it, continuing with all of the mocking and not so witty quips about things like "inchage"?

    Ohmage is a word that, for whatever reason, isn't commonly used, so it can sound a bit silly to someone who is ignorant of the fact that it is a word. That ignorance can lead them to make uninformed and completely incorrect statements like this one:

    "No, there is no such word but yes, it probably will appear in future dictionaries. Language seems to evolve according to the whims of those who misuse it.

    "Ohmage" instead of impedance is a bit like calling the distance from head to toe "inchage" rather than height."

    Wrong, wrong and wrong…

    There is such a word. If it continues to appear in dictionaries it will not be because of debasing of language; it will be because it's simply not removed from future revisions of dictionaries.

    Inchage is a word, like ohmage, that never gained common use (apparently even less than ohmage). As expressions of distance/length, footage, yardage, and mileage have common usefulness, while inchage does not. Like ohmage, because you're ignorant of it, it sounds silly to you, so you choose to mock it.

    When someone (also out of ignorance) intuits that the word they're searching for (following the logic of voltage, amperage, and wattage) is "ohmage," they actually are stumbling on to a real word and, effectively, the right word. The problem here is that it's the wrong word in that it's not the conventional word.

    IMO, the "desire to educate fellow bassists" could be fulfilled without all of the ridicule and angst. What is it that raises someone using the word ohmage to that level?
    Last edited: Jan 2, 2015
    Winoman likes this.