From: phil_a@tpg.com.au   
      
   "patrick-turner"   
   Phil mentioned...   
   >   
   > ** The AR9 was first sold in 1978 and used two 12 inch woofers, same ones   
   > used in the AR11 released in 1977.   
   ** AR constantly refer to the above woofers as being 12 inch.   
   But they are closer to 11 inch, in reality.   
   I remember now there was something odd about the woofers in a friend's   
   AR11s.   
   The impedance curve of the AR11 was so wild I drew it out and kept a copy -   
   here is a listing:   
      
   DC       =    4.2 ohms   
   10Hz    =    5 ohms   
   32Hz    =  30 ohms   
   100Hz  =    4 ohms   
   500Hz  =   10 ohms   
   1kHz     =   4 ohms   
   2kHz     =   2.5 ohms   
   5kHz     =   2 ohms   
   10kHz   =   2 ohms   
   12kHz   =   2 ohms   
   20kHz   =   3 ohms   
   50kHz   =   8 ohms   
      
   BTW:   
   The low figures above 2kHz are because the 4ohm dome mid and 4ohm dome   
   tweeter are operating in parallel.   
   The owner was originally using twin wire he got from Tandy / Radio Shack (   
   14x0.14 stuff ) -  so each run was about 1.5 ohms resistance, plus about 2.5   
   ohms of inductance at 15kHz.   
   So I made him up some leads using "Tocord" ( aka Mogami cable)  with near   
   zero inductance and about 0.2 ohms resistance.   
   His mouth dropped open when he heard the difference.   
   ..  Phil   
      
   Before completely re-forming the pair of AR9 I was given to fix, I did   
   manage to get one working as it may have worked when new by swapping out   
   working mid/HF drivers so that enough working drivers were in the same box.   
   I found the acoustic response response using the middle position of mid-HF   
   level switches was anything but flat and extremely poor by my standards. I   
   don't recall any HF dips to 2 ohms as you state exists above 2kHz,   
      
      
   ** Please, read my post more carefully - it's the  *AR1 *  that has absurdly   
   low impedance above 2 kHz.   
      
   > IMHO, it is very easy to make a better pair of speakers than the AR9.   
      
      
   ** The various AR speakers I have seen and tested were riddled with unholy   
   compromises and evil Yankee dodges  - plus built as cheaply as possible.   
      
   Their Aussie built models were even worse, with plastic veneer  -  yuck.   
      
   But still better than Bose by a mile.   
      
      
      
   ...  Phil   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)