From: detritus@ix.netcom.com   
      
   Phil Allison wrote:   
      
   > "John L Stewort"   
   > >   
   > > 'Phil Allison   
   >   
   > >> >   
   > >> > When loudsppeakers are connected in series, each unit becomes the   
   > >> source impedance for the other(s).-   
   > >>   
   > >> ** Long as the speakers are near identical  -  this has NO effect.   
   > >>   
   > >> The signal voltage divides equally across each speaker at all   
   > >> frequencies.   
   > >>   
   > >> -   
   > >> >  Not recommended at all, under any circumstance!-   
   > >>   
   > >>   
   > >> ** Bollocks.   
   > >>   
   > >> The Bose 802 has eight identical 1ohm drivers in series.   
   > >>   
   > >> -   
   > >> > Four similar in series/parallel should be OK. Connect the mid points   
   > >> > together as well.-   
   > >>   
   > >>   
   > >> ** You just contradicted yourself.   
   > >>   
   >   
   >     ** FUCKHEAD  !!   
   >   
   > > > That is why I recommended the fire extinguisher.   
   >   
   > ** Certainly  -  go shove the hose up your arse and push the lever.   
   >   
   >    Might just get some of the SHIT out of you.   
   >   
   > > Good for the Bose & its 8R speakers. Who cares?   
   >   
   > ** What a fucking bullshitter.   
   >   
   > The Bose 801 uses 1ohm speakers, eight of them, all in series and all   
   > perfectly DAMPED.   
   >   
   > You stupid, fucking septic twat.   
   >   
   > ....   Phil   
      
   ...   
      
   Back in the day, the 800 series came abour due to   
   people using 901s for live vocals.  The 901s had   
   nine speakers, 8 in the back side and one in the   
   front.  Musicians turned them around and pointed   
   the 8 at the audience, but the single (now) rear-   
   facing driver caused problems with feedback.   
   Bose brought out the 800 series for live sound   
   reinforcement use, and they did away with the   
   problematic ninth driver...but since you must have   
   a number of drivers that has a square root in   
   order for the impedance of the cabinet to equal   
   the impedance of a single driver, they replaced   
   the missing driver with a 50-watt resistor to keep   
   the box at 8 ohms. (I seem to remember it wasn't   
   an 8-ohm resistor, though...11 ohms? Something   
   like that...)  This fix turned one ninth of the applied   
   power into heat, making the already power-hungry   
   boxes even more so. Eventually the cabs evolved   
   into the injection-molded box variety with the 1-ohm   
   drivers in series; these drivers have plastic frames,   
   and whenever a box gets knocked over (they're usually   
   up on sticks) the magnets rip free of the plastic baskets,   
   necessitating replacement of some or all of them.   
   The series wiring scheme means that if any of the drivers   
   packs up by going open, the box will go silent - not a   
   good thing in a live situation, if you ask me. I realy don't   
   see why they didn't just go to 16-ohm drivers; two series-   
   parallel networks of four drivers each (at 16 ohms per network)   
   placed in parallel would arrive at the desired 8-ohm impedance.   
      
   Back in the day - early 70s - my band had the first Bose system   
   in Colorado, consisting of 8 Bose 800 boxes (four on a side)   
   driven by two Altec 9440A power amps - 1,600 watts, and   
   those boxes needed every bit of it.  By the standards of the   
   day, it was a kickass rig.  It replaced a pair of Altec A7-500   
   cabinets driven by a pair of Dynaco MK III amps (built from   
   kits and modded for higher output by yours truly) but we kept   
   the old rig as backup; out of doors, the Altecs provided   
   superior coverage, and in that case we used the Bose   
   rig for foldback - best monitors I've ever heard, bar none.   
      
   Lord Valve   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)