USNRET Posted May 20, 2009 Share Posted May 20, 2009 OK, my curiousity has bitten. I know HT center channel and I know that my old McIntosh C-28 pre-amp had a summed center out. The owners manual for a KHorn says that if you wish to use a center channel contact tech support on how to connect it. How DO you connect a center channel in this configuration? Quote Link to comment Share on other sites More sharing options...
Chris A Posted May 20, 2009 Share Posted May 20, 2009 From a 1958 JAES article by P.W. Klipsch (see enclosure). Klipsch 2-to-3 channel circuit 2 (1958 JAES paper).pdf Quote Link to comment Share on other sites More sharing options...
Chris A Posted May 20, 2009 Share Posted May 20, 2009 If you don't have output taps, here is another circuit (see enclosure). Same article as above. Chris Klipsch 2-to-3 channel circuit (1958 JAES paper).pdf Quote Link to comment Share on other sites More sharing options...
colterphoto1 Posted May 20, 2009 Share Posted May 20, 2009 and here's what it looks like (PWK's personal unit from the Klipsch Museum) Quote Link to comment Share on other sites More sharing options...
USNRET Posted May 20, 2009 Author Share Posted May 20, 2009 and here's what it looks like (PWK's personal unit from the Klipsch Museum) Anyone care to elaborate on what this switch does? A; A/B; B, pot? And more appropriate, if I were to get the desire to try this, what would the design look like today? Remote switching, remote volume, list of parts...or how many brewskis would it take for someone to make me a nifty contraption? Quote Link to comment Share on other sites More sharing options...
Istari Posted May 20, 2009 Share Posted May 20, 2009 Wow!, Paul's own unit!, Sweet! I notice that it is wired for the Diff or Sum, that would be an interesting switch to have! I do have the Three Channel setup myself. 2 Walnut Klipschorns and a Walnut Belle, all being driven by a Fisher 500C that has the built in Center Channel output.This particular unit appears to give you the option of having the summed outputs of the left and right channel (A+ or the difference between the left and right channel (A- being sent to the Center speaker. There would be differences in the signal being reporduced by the Belle depending on which position the bottom switch is set on. Quote Link to comment Share on other sites More sharing options...
USNRET Posted May 20, 2009 Author Share Posted May 20, 2009 I am toying with the idea of pluggin in a Belle between two Khorns just to check it out. Using Peach and MC2125 Quote Link to comment Share on other sites More sharing options...
Arkytype Posted May 21, 2009 Share Posted May 21, 2009 Here's the paper PWK wrote describing how to derive a center channel from a left and right signal. The circuit shown is only appropriate for amplifiers having output transformers. Lee PWK IRE paper.pdf Quote Link to comment Share on other sites More sharing options...
USNRET Posted May 21, 2009 Author Share Posted May 21, 2009 Thanks, good reading mat'l it's slow today. Quote Link to comment Share on other sites More sharing options...
Arkytype Posted May 21, 2009 Share Posted May 21, 2009 Here's a Dope From Hope which shows two more useful circuits for deriving a center channel. If you think the use of a center channel is relatively new, William B. Snow of Bell Labs was issued patent number 2,137,032 on November 15, 1938 for Sound Reproducing System. This patent is is noteworthy on several counts. Snow discusses the use of signal delay and volume level to spatially localize a sound source. Helmut Haas didn't "discover" this until 1946. Snow also advocates the use of three or more loudspeakers spaced across the soundstage. If you have the complete Dope From Hope set, read the Symposium on Auditory Perspective written in 1933. It took another two decades before "stereo" became a household word. Lee Snow Patent.pdf Quote Link to comment Share on other sites More sharing options...
Arkytype Posted May 21, 2009 Share Posted May 21, 2009 OK, looks like you can't post more than one .pdf at a time. Here's the DFH article. Lee Dope From Hope.pdf Quote Link to comment Share on other sites More sharing options...
USNRET Posted May 21, 2009 Author Share Posted May 21, 2009 Thanks Lee, heck even I can understand the DFH article. Now on to research what I need to build fig 2 with. Quote Link to comment Share on other sites More sharing options...
Coytee Posted May 21, 2009 Share Posted May 21, 2009 You might contact Mark (Deneen). I speculate he's out of them but he built several mixer boxes at one time. I don't think he built too many and if your luck is as mine, he's probably sold them all but it wouldn't hurt to inquire. Quote Link to comment Share on other sites More sharing options...
Arkytype Posted May 21, 2009 Share Posted May 21, 2009 Here's yet another DFH showing how to derive a center channel. If you have a Class D amplifier such as based upon the Tripath chipset, you cannot connect the "grounds" or minus terminals together. Lee Vol. 2 #13.pdf Quote Link to comment Share on other sites More sharing options...
USNRET Posted May 21, 2009 Author Share Posted May 21, 2009 If workable I would use a McIntosh MC2125 for the L&R and then need to figure out the 'center' amp. VRDs or some Baldwins may be in my near future. or the future amps as l/r and the Mc as the center. Quote Link to comment Share on other sites More sharing options...
USNRET Posted May 21, 2009 Author Share Posted May 21, 2009 You might contact Mark (Deneen). I speculate he's out of them but he built several mixer boxes at one time. I don't think he built too many and if your luck is as mine, he's probably sold them all but it wouldn't hurt to inquire. I have two left. How cool is that. Mark, I had sent you email earlier regarding these. I'll have to check the email bucket when I get home. Quote Link to comment Share on other sites More sharing options...
Video Guy Posted May 21, 2009 Share Posted May 21, 2009 You might contact Mark (Deneen). I speculate he's out of them but he built several mixer boxes at one time. I don't think he built too many and if your luck is as mine, he's probably sold them all but it wouldn't hurt to inquire. I have two left. I'm interested in one of these if you have any left, I sent you an email. Quote Link to comment Share on other sites More sharing options...
Coytee Posted May 21, 2009 Share Posted May 21, 2009 Looks like they will be sold out here. You can send my commission in either form of fruit....Blueberry or Peach... all I ask is you please remove any leaves and stems! [] Quote Link to comment Share on other sites More sharing options...
USNRET Posted May 21, 2009 Author Share Posted May 21, 2009 please remove any leaves and stems! what was that line? No stems or seeds that you don't need... Quote Link to comment Share on other sites More sharing options...
USNRET Posted May 22, 2009 Author Share Posted May 22, 2009 OK, now that we are working toward the center channel, let's go here: Am I correct in assuming that I could use Mark's mixer to feed a powered subwoofer instead of the center? Both sub and center? And Mark does your mixer send a sum of the L&R or a differential? the weather needs to clear up so we can fly some fighter jets.....i'm sitting here thinking of ways to spend more Quote Link to comment Share on other sites More sharing options...
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