Hi, Paul Thurst wrote a posting in his blog a while back on this very issue:
http://www.engineeringradio.us/blog/2012/05/summing-to-mono/ Sums up the issue well and offers an inexpensive circuit you can wire up. > > > Combining Left and Right channels to produce Mono has been a hoary old > problem since the beginning of Stereo. Just paralleling the outputs > causes electrical problems as Cowboy has identified, some or all of > which are frequency and phase dependent. > > Running left and right into a mixer should work but that relies on the > integrity of the original stereo,and there are a number of classic > 'channels out of phase' releases which once identified can be dealt > with. They didn't stop when CD's came along! If you are sourcing > material on mp3 from who knows where, you are relying on a transcription > process you have no control over. > > I seem to remember some clever 3 resistor arrays that matched the output > impedance and fed a single channel. Bit of insertion loss but enough > isolation to avert the electrical problems. > > Robert > > On 04/02/14 10:14, Cowboy wrote: > > On Monday 03 February 2014 04:01:05 pm Rick wrote: > > > >> Is it correct to say you're advising strictly on the traditional analog > >> physical output realm? > >> > > Yes. > > If it's virtual, there's no danger of over current blowing up parts. > > ( although depending on how they combine the channels, there may > > still be distortion, or there may not. ) > > > > > >> I have to say, I'm intrigued by Jim's virtual approach using Jack! > >> > > I am too. > > If you do a straight L+R and there are no phase problems in the > > original material, it should be fine ! It should mimic what one ear would > > hear. > > > > It's when there are phase differences that real parts become unhappy. > > If it's a straight L+R in the virtual world, there could still be phase > > distortions, but it's an intriguing concept. > > > > > > _______________________________________________ > Rivendell-dev mailing list > [email protected] > http://caspian.paravelsystems.com/mailman/listinfo/rivendell-dev _______________________________________________ Rivendell-dev mailing list [email protected] http://caspian.paravelsystems.com/mailman/listinfo/rivendell-dev
