Deang Posted April 12, 2005 Share Posted April 12, 2005 Anyone know what Fs is for that thing, or much power she takes at 4.5kHz without crapping out? Quote Link to comment Share on other sites More sharing options...
BEC Posted April 12, 2005 Share Posted April 12, 2005 About 5 watts above 3.5 khz providing you have the newer style diaphragms. Don't try any amount of power below 3.5 khz. I know that I turned a voice coil into a slinky at about one-half watt at around 3 khz. Bob Quote Link to comment Share on other sites More sharing options...
Deang Posted April 12, 2005 Author Share Posted April 12, 2005 "About 5 watts above 3.5 khz providing you have the newer style diaphragms." Do I? I need to be an octave above Fs, I need to know what that is. Quote Link to comment Share on other sites More sharing options...
BEC Posted April 12, 2005 Share Posted April 12, 2005 Yes, latest and greatest. By the way, the 5 watt thing is just a spec. Haven't tried that much power on one. Bob Quote Link to comment Share on other sites More sharing options...
BEC Posted April 12, 2005 Share Posted April 12, 2005 Haven't seen an Fs spec. LF cutoff is 2500 hz. Bob Quote Link to comment Share on other sites More sharing options...
Thumpelstiltskin Posted April 12, 2005 Share Posted April 12, 2005 Hey Bob, Are the diaphragms you put in my K-77s over the weekend the "newer style"? Rick. Quote Link to comment Share on other sites More sharing options...
BEC Posted April 12, 2005 Share Posted April 12, 2005 Yes, all I have ever sold have been the newer type. Bob Quote Link to comment Share on other sites More sharing options...
Deang Posted April 12, 2005 Author Share Posted April 12, 2005 ! Quote Link to comment Share on other sites More sharing options...
Deang Posted April 12, 2005 Author Share Posted April 12, 2005 ! Quote Link to comment Share on other sites More sharing options...
Deang Posted April 12, 2005 Author Share Posted April 12, 2005 ! Quote Link to comment Share on other sites More sharing options...
BS Button Posted April 12, 2005 Share Posted April 12, 2005 Dean, You've got an e-mail. There was a good EV T35 and one that was not so good. Which one was which? Quote Link to comment Share on other sites More sharing options...
Deang Posted April 12, 2005 Author Share Posted April 12, 2005 ! Quote Link to comment Share on other sites More sharing options...
Deang Posted April 12, 2005 Author Share Posted April 12, 2005 ! Quote Link to comment Share on other sites More sharing options...
John Warren Posted April 13, 2005 Share Posted April 13, 2005 Quote Link to comment Share on other sites More sharing options...
John Warren Posted April 13, 2005 Share Posted April 13, 2005 Above is the impedance plot for a T35. The large peak at 3kHz is Fs. An octave above is 6kHz. The 6kHz crossover used by Klipsch for 40+ years is the right place to be. Distortion in tweeters is lower the further the crossover is from Fs. An octave is a good place to be. The plotted frequency repsonse on the EV literature is fiction. Response above 15kHz is non-existent, the diaphragm hits a mass roll-off. That's why annular ring tweeters were developed. Quote Link to comment Share on other sites More sharing options...
Al Klappenberger Posted April 13, 2005 Share Posted April 13, 2005 Guys, Here's the correct plot of the complex impedance of the K77 tweeter. This includes the often ignored reactrive component. The lower plot scale says 0-1 V/V. That corresponds to 0-10 Ohms. Al K. Quote Link to comment Share on other sites More sharing options...
Deang Posted April 13, 2005 Author Share Posted April 13, 2005 Well, that settles that. Thanks John. What I'm trying to figure out is how PK got away with using this tweeter later when he went to the Type AA. The K-55-V with spring loaded terminals certainly doesn't do much above 4.7kHz. He didn't get the response he wanted with that driver until he got the version with the dual phasing plug. It works with the Type A, since with a first order, the tweeter is still emitting 68% of it's output a half octave below cutoff (4.5kHz). With the AA, it's 9db down at the same point. Quote Link to comment Share on other sites More sharing options...
Al Klappenberger Posted April 13, 2005 Share Posted April 13, 2005 Dean, Here's the first case study. The plot is of a T-35 (not marked K77) in black. The red plot is a K77 that has had it's diaphragm replaced. I got that one with my used center Belle. Al K. Quote Link to comment Share on other sites More sharing options...
Al Klappenberger Posted April 13, 2005 Share Posted April 13, 2005 Dean, Here's another case study. This is the plots of 4 different K77 and T-35 tweeters all done on the same plot, one over top the other. The vertical scale is not calibrated for absolute SPL. This plot was done using white noise. The other plot was using a swept warble tone. Al K. Quote Link to comment Share on other sites More sharing options...
Al Klappenberger Posted April 13, 2005 Share Posted April 13, 2005 Dean, Here's a comparison between a square-magnet K77M and a round-magnet K77 (AlNiCo). I THINK the red curve is the same tweeter as in the first case above that had it's diaphragm replaced. Notice now much hoter the "M" is. Al K. Quote Link to comment Share on other sites More sharing options...
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