XPost: uk.rec.audio   
   From: E1ron@hotmail.com   
      
   On 06/09/2010 20:48, Ian Bell wrote:   
   > 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.   
      
   Can't guess how to wire them to give the desired attenuation.   
      
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   Eiron.   
      
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