From: phil_a@tpg.com.au   
      
   "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.  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.   
      
   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.   
      
   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 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   
      
      
      
   ....  Phil   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)