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   rec.audio.tubes      Tube-based amplifiers... that go to 11      52,877 messages   

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   Message 51,976 of 52,877   
   Phil Allison to All   
   Re: Professional Radio Engineer   
   23 Dec 12 19:08:11   
   
   From: phil_a@tpg.com.au   
      
   "flipper =  FUCKWIT  PIG  "   
      
      
   >, "Phil Allison"   
   >   
   >>"flipper"   
   >>   
   >>> Well, I suppose we just wouldn't mention that to be a transmission   
   >>> line at audio frequencies the cable would have to be miles long.   
   >>   
   >>   
   >>** Not this stupid red herring again  !!!   
   >>   
   >>I though only fuckwit radio hams misunderstood the topic of transmission   
   >>lines so badly.   
   >>   
   >>The theory of  "electrically short"  transmission lines says they act like   
   >>pure capacitors if unterminated and like inductors if shorted.   
   >   
   > I know about "electrically short" transmission lines but sending audio   
   > over a few meters of cable is not just "electrically short," it's   
   > ridiculously short and renders any notion of 'characteristic   
   > impedance' irrelevant.   
      
      
   ** But I just proved that stupid idea wrong  -  YOU  IGNORANT FUCK  HEAD   
   !!!!   
      
      
   >   
   >> As with   
   >>longer transmission lines, when terminated by a resistance equal to the   
   >>line's characteristic impedance  - there is almost no upper limit to the   
   >>frequency range.   
      
      ( snip putrid, fuckwit SHIT )   
      
   >>Ordinary twin speaker cables are transmission lines, but with a   
   >>characteristic impedance of around 100 ohms - so when terminated by an 8   
   >>or   
   >>4 ohm resistor show high frequency roll off above the audio band due to   
   >>series inductance. Specially made cables ( woven conductor or strip lines)   
   >>with a characteristic impedance of 8 ohms show no such roll of.   
   >   
       ( snip more fuckwit  SHIT )   
      
      
   >>Mostly this roll off hardly matters, but a few cases exist where the   
   >>speaker's impedance falls to a low value ( 1 or 2 ohms) at or near the top   
   >>of the audio band   
   >   
   > Which rules out any notion of supposedly 'impedance matching' ...   
      
      
   **  Your fuckwit idea pal, not mine  -  ASSHOLE !!!   
      
      
   >> and then it can matter quite a bit. The original QUAD ESL   
   >>is one example and even the AR11 has a huge dip in the impedance at 5 to 6   
   >>kHz   
   >   
   > The unfortunate speaker cable finds itself stuck between the   
   > amplifier, a low-output impedance voltage source, and the loudspeaker,   
   > whose impedance and phase are all over the place. As such, the actual   
   > impedance with which the speaker cable works is effectively zero,   
      
      
   ** WRONG !!!   
      
    It has series inductance, quite a bit if it is more than 5 metres long.   
      
      
   > because it is electrically short ....   
      
   ** Go choke to death of your Xmas turkey   
      
       -  you vile pile of worthless scum.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)   

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