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Crossover Voodoo

Discussion in 'Amps [BG]' started by acmebass, Nov 5, 2013.


  1. acmebass

    acmebass

    Joined:
    Mar 22, 2013
    Location:
    Englewood, CO
    Disclosures:
    Owner/Designer, Acme Sound/Acme Low B
    Hey- I've got one for you speaker buffs.

    I posted some pictures of one of my crossovers on my FB page, and got a few comments.

    Check the comment I got from a guy:

    "I would add some connectors and signal buffers to isolate the crossover and reduce current pulled from the driver."

    To which I replied:

    "Interesting observation, Sergei. I'd love to see a link to whatever it is you're talking about!

    Isolate the crossover from what?

    What is "current pulled from the driver?" How do you "pull" current?"


    Obviously, I never heard anything like this in my life. So check out his response:

    "Current pulled from the supply is the current carried throught the transmission line to the load. Load is the crossover. If you pull more current than the supply can provide you will "clamp" the output.l, thus change your signal. Buffer is the device that allows you use external supply (not the signal source) to drive your speaker - basically have a mini analog amp on you board and it will increase the performance."

    Yeah, I know, it's the internet! "Increase the performance."

    Wow! That sounds great, if it seems to echo the ad for Viagra that I heard.

    Anybody have any idea what this dude's trying to say?

    Thought it might be good for a laugh.

    Andy
     
  2. B-string

    B-string Gold Supporting Member

    Joined:
    Nov 21, 2008
    Location:
    Lake Havasu City, Az USA
    It's all held moot by a $13,000 power cord, $18,000 speaker lead and a tinfoil hat!
    I could use the drugs he is using to escape some reality of my own ;).
     
  3. acmebass

    acmebass

    Joined:
    Mar 22, 2013
    Location:
    Englewood, CO
    Disclosures:
    Owner/Designer, Acme Sound/Acme Low B
    Love it!

    A
     
  4. Marial

    Marial They make pills for that, right? Gold Supporting Member

    Joined:
    Apr 8, 2011
    Location:
    Emerald City
    Sounds like some perpendicular crosstalk for sure.
     
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  6. BurningSkies

    BurningSkies CRAZY BALDHEAD Supporting Member

    Joined:
    Feb 20, 2005
    Location:
    Seweracuse, NY
    I've had a few people suggest that there can be noticeable 'insertion loss' from having a crossover in your cabs. I had always heard that the loss of power was entirely negligible if at all. Is this what he's getting at? Buffering the crossover so that there is no 'loss of power' due to the crossover circuit?

    I admittedly don't know a ton of heavy duty electronics info, but its always sounded like voodoo to me.
     
  7. acmebass

    acmebass

    Joined:
    Mar 22, 2013
    Location:
    Englewood, CO
    Disclosures:
    Owner/Designer, Acme Sound/Acme Low B
    Don't ask me what he's talking about. I haven't the foggiest.

    That said, any resistive component has an energy loss associated with it.

    Andy
     
  8. BurningSkies

    BurningSkies CRAZY BALDHEAD Supporting Member

    Joined:
    Feb 20, 2005
    Location:
    Seweracuse, NY
    Yes, but some people seem very concerned about the amount of loss. That's the only thing that I can think he's trying to get at. Still...hrrrm. Is he an English as a 4th language speaker?
     
  9. acmebass

    acmebass

    Joined:
    Mar 22, 2013
    Location:
    Englewood, CO
    Disclosures:
    Owner/Designer, Acme Sound/Acme Low B
  10. BurningSkies

    BurningSkies CRAZY BALDHEAD Supporting Member

    Joined:
    Feb 20, 2005
    Location:
    Seweracuse, NY
  11. B-string

    B-string Gold Supporting Member

    Joined:
    Nov 21, 2008
    Location:
    Lake Havasu City, Az USA
    O M G..........someone sub nitrous oxide for his oxygen tank? Maybe he works for BOSE?
    Quote " read about power supply design. Current limiting and impedance matching..." for a passive audio crossover? I laughed so hard I think I wet myself.

    [Note for internet: Engage brain before putting mouth or hands in gear]
     
  12. acmebass

    acmebass

    Joined:
    Mar 22, 2013
    Location:
    Englewood, CO
    Disclosures:
    Owner/Designer, Acme Sound/Acme Low B
    I know. I keep asking myself, is he crazy, or a genius? Maybe both?

    Haha.

    A
     
  13. Woodstockz

    Woodstockz

    Joined:
    Sep 23, 2011
    Location:
    San Diego, Ca
    Some of those geniuses are completely out of touch with the real world.
     
  14. B-string

    B-string Gold Supporting Member

    Joined:
    Nov 21, 2008
    Location:
    Lake Havasu City, Az USA
    Obviously more DC than AC. :)
     
  15. Zooberwerx

    Zooberwerx Gold Supporting Member

    Joined:
    Dec 21, 2002
    Location:
    Virginia Beach, VA
    Don't know much about electronics but I do know how the ED meds work. I do have a question, though:

    The Cialis commercial shows a couple in matching bathtubs holding hands. Romantic, right? Well, how come when I place an old toilet in my front yard as a planter, the civic league gets all bent out of shape?!? Porecelain is porcelain in my book.

    Back to you, Andy!

    Riis
     
  16. B-string

    B-string Gold Supporting Member

    Joined:
    Nov 21, 2008
    Location:
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    Not to mention who needs that stuff to sit naked in SEPARATE bath tubs??????
     
  17. acmebass

    acmebass

    Joined:
    Mar 22, 2013
    Location:
    Englewood, CO
    Disclosures:
    Owner/Designer, Acme Sound/Acme Low B
    You guys are silly. But I suppose it's appropriate, under the circumstances!

    A
     
  18. Blankandson

    Blankandson

    Joined:
    Oct 20, 2010
    Location:
    Branson, Missouri
    Doubt if his drug of choice is Viagra or Calais. Current price at Wal-Mart pharmacy in the Nashville area is $33 a drop! Maybe more like 12 cans of Monster drink before lunch.
     
  19. Zooberwerx

    Zooberwerx Gold Supporting Member

    Joined:
    Dec 21, 2002
    Location:
    Virginia Beach, VA
    Yeah, it's pricey. My wife gives me one every night. Keeps me from rolling out of bed.

    Riis
     
  20. Steve Dallman

    Steve Dallman

    Joined:
    Mar 5, 2006
    Location:
    East Central Wisconsin
    I think I smell a commodity commonly found where bulls congregate.
     
  21. B-string

    B-string Gold Supporting Member

    Joined:
    Nov 21, 2008
    Location:
    Lake Havasu City, Az USA
    Did you just sneeze? :)
     

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