178b48c5   
   XPost: uk.rec.audio   
   From: ruffrecords@yahoo.com   
      
   Andre Jute wrote:   
   > Time to return to tech-talk.   
   >   
   > In a modest-sized room (by horn standards anyway) I want to rig up a   
   > singleton of my modded semi-Fidelio bicor horns for Lowther PM6A. I   
   > thought I'd do the monoing in a specially made 1 metre cable between   
   > the CD player and the power amp.   
   >   
   > The QUAD CD expects to see at least 10K impedance on its outputs.   
   > Output of the CD player is 2Vrms and about 0.5Vrms of that is required   
   > to drive the amp to enough power to handle the horns, so high value   
   > resistors can be used in the monomaker if there is any advantage to be   
   > gained.   
   >   
   > However, the sound is NOT intended to be reprocessed as stereo   
   > downstream (home installation, not studio); if I want stereo again,   
   > i'll just plug in a stereo cable.   
   >   
   > The pot on the integrated amp is probably (the board won't be here   
   > until Tuesday and i can't read the spec on the piccie) 50K Alps but I   
   > can replace it with a DACT of which I have a good selection of values.   
   >   
   > So what value resistors would you use for monoing?   
   >   
   > How many? Only two, or three?   
   >   
   > With your choice of values, what can I expect to lose from the monoing   
   > in bandwidth as distinct from gain?   
   >   
   > Andre Jute   
   > Visit Jute on Amps at   
   >   http://www.audio-talk.co.uk/fiultra/   
   > "wonderfully well written and reasoned information for the tube audio   
   > constructor"   
   > John Broskie TubeCAD&  GlassWare   
   > "an unbelievably comprehensive web site containing vital gems of   
   > wisdom"   
   > Stuart Perry Hi-Fi News&  Record Review   
   #   
      
   I would use 3 resistors, all 10K. I think you can guess how to wire them. The   
   important thing is to   
   place them at the amp end.   
      
   Cheers   
      
   Ian   
      
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