Frzninvt Posted August 7, 2006 Share Posted August 7, 2006 I replaced the driver AND the network to get the best of both worlds. I run the solder type dual phase plug K-55V's in my center and rears, but K-55M's in my mains with updated stock AK-3 networks. Quote Link to comment Share on other sites More sharing options...
tigerwoodKhorns Posted August 7, 2006 Share Posted August 7, 2006 Since so many have "fixed" the glitch of the K-55V by replacing it with a K-55M that also has a glitch, I don't think anyone can hear it. Bob Crites You kidding Bob? Everyone is going to hear it now that it has been documented. What I am taking away from these tests is that my JBL 2470's should be just fine in the K Horn with no loss in performance due to their "rolloff" at 400 hz because they are no worse than the K55's. Quote Link to comment Share on other sites More sharing options...
ZAKO Posted August 7, 2006 Share Posted August 7, 2006 BEC .....These are very good plots and without a anechoic chamber too. Excellent job Quote Link to comment Share on other sites More sharing options...
colterphoto1 Posted August 7, 2006 Share Posted August 7, 2006 Great, I bought replacement type AA/A's for my LS with K55M. Sounds like a mistake based on these results. Maybe I should swap out for any other 55 type? M Do I have the WRONG NETWORK then???? Quote Link to comment Share on other sites More sharing options...
PrestonTom Posted August 7, 2006 Share Posted August 7, 2006 Bob, Thanks for taking the time to do this and to share the results with us. -Tom Quote Link to comment Share on other sites More sharing options...
BEC Posted August 7, 2006 Author Share Posted August 7, 2006 Michael, In my opinion what you have will work good. Bob Quote Link to comment Share on other sites More sharing options...
colterphoto1 Posted August 7, 2006 Share Posted August 7, 2006 I feel like I should at least have the latest Klipsch designed network in there, is there an AL3 available or would there be a problem with the K55M then? Quote Link to comment Share on other sites More sharing options...
BEC Posted August 7, 2006 Author Share Posted August 7, 2006 The AL-3 would also be fine for them. Bob Quote Link to comment Share on other sites More sharing options...
Deang Posted August 7, 2006 Share Posted August 7, 2006 Michael -- you can create a bigger impact on the response with speaker placement than the differences in those drivers. And don't forget the effects of the room -- RTA the speakers without any applied EQ and the response is all over the place. A year ago I would have looked at those plots and thought about how different those drivers are -- now I look at them and see how close to the same they are. Bob is right -- it doesn't amount to squat difference, and you're fine with the networks you have. Nice work Bob. Quote Link to comment Share on other sites More sharing options...
Deang Posted August 7, 2006 Share Posted August 7, 2006 Since so many have "fixed" the glitch of the K-55V by replacing it with a K-55M that also has a glitch, I don't think anyone can hear it. Bob Crites You kidding Bob? Everyone is going to hear it now that it has been documented. What I am taking away from these tests is that my JBL 2470's should be just fine in the K Horn with no loss in performance due to their "rolloff" at 400 hz because they are no worse than the K55's. With the other parts of the network terminated with resistors, my RTA shows the 2470 as being almost 5dB down at 400Hz (on the Trachorn). When I add the bass bin back in, the response through the RTA looks the same at 400Hz as it did when I used K-55-V's. Quote Link to comment Share on other sites More sharing options...
Mr. Widget Posted August 8, 2006 Share Posted August 8, 2006 Bob, Thanks for taking the time to do this and to share the results with us. -Tom Yes, thanks for the hard work and sharing! I was hoping to get opinions from you as to whether or not my my K-55V drivers seemed to be up to snuff... I just rescaled your measurement of the single phase plug driver to make a direct comparison with mine and it seems that they do indeed pretty much agree with each other within what I would consider normal tolerances. Is there an overall preferred driver based on subjective listening? Do the newer horns exhibit a similar sound quality or have there been changes? Widget Quote Link to comment Share on other sites More sharing options...
colterphoto1 Posted August 8, 2006 Share Posted August 8, 2006 well I do have the YPAO on the Yammie, so that should have taken care of any audible spike if it were present at all. It sounds good to my ears. I need to get some of those unbunchable panties! M Quote Link to comment Share on other sites More sharing options...
BEC Posted August 26, 2006 Author Share Posted August 26, 2006 Just adding another test trace to the group. This is a K-55V 1 piece phase plug model tested twice with the only difference in the test set-up being the added P-trap used in the test with the red trace. Bob Crites Quote Link to comment Share on other sites More sharing options...
pauln Posted August 27, 2006 Share Posted August 27, 2006 What about the K-55X, or is it the same as one of those? Quote Link to comment Share on other sites More sharing options...
Deang Posted August 27, 2006 Share Posted August 27, 2006 It's the same as the K-55-V with the single phase plug. Quote Link to comment Share on other sites More sharing options...
JohnA Posted August 28, 2006 Share Posted August 28, 2006 Mr. Widget, The speaker is spec'd at +/- 5 db in your vintage, so I'd say your's are just as they should be. In general, horns are not as smooth as some direct radiators when tested, but usually sound more alive and real. Quote Link to comment Share on other sites More sharing options...
greg928gts Posted August 30, 2006 Share Posted August 30, 2006 . . . . . But, the particular one I tested at least gives up a couple of dB in output compared to the K-55V single piece phase plug and the K-55M. And this is bad why? I'd take this driver for being smooth and just a tad set back in the mix. Of course with SET I'm getting all the great midrange I could want. I would also bet that it would be very difficult to pick out the difference in sound between any of these. How does one tell a K-55 with a two piece phase plug vs. a one piece? Greg Quote Link to comment Share on other sites More sharing options...
BEC Posted August 30, 2006 Author Share Posted August 30, 2006 . . . . . But, the particular one I tested at least gives up a couple of dB in output compared to the K-55V single piece phase plug and the K-55M. And this is bad why? I'd take this driver for being smooth and just a tad set back in the mix. Of course with SET I'm getting all the great midrange I could want. I would also bet that it would be very difficult to pick out the difference in sound between any of these. How does one tell a K-55 with a two piece phase plug vs. a one piece? Greg Oh, I don't think it is bad. Just seems they gave up a bit of output to get a smoother frequency response. There are almost always trade-offs. I agree that all of them test so close that picking out a difference between any of the K-55s would be tough. The two piece phase plug K-55Vs were all built in the early 80s and have solder terminals on them instead of push type terminals. Bob Crites Quote Link to comment Share on other sites More sharing options...
Mr. Widget Posted August 31, 2006 Share Posted August 31, 2006 Mr. Widget, The speaker is spec'd at +/- 5 db in your vintage, so I'd say your's are just as they should be. In general, horns are not as smooth as some direct radiators when tested, but usually sound more alive and real. Thanks John. That is what I assumed, but I was hoping for confirmation from those with much more Klipsch knowledge than I have. The horns and drivers that I have came out of Radio City Music Hall in NYC years ago and I would assume they saw some pretty hard use at times. It's nice to know they have stood up to it well. Widget Quote Link to comment Share on other sites More sharing options...
JohnA Posted September 6, 2006 Share Posted September 6, 2006 Oh, I don't think it is bad. Just seems they gave up a bit of output to get a smoother frequency response. There are almost always trade-offs. I agree that all of them test so close that picking out a difference between any of the K-55s would be tough. The two piece phase plug K-55Vs were all built in the early 80s and have solder terminals on them instead of push type terminals. Bob Crites I don't think the 2-piece phase plugs give up any output. I think you are seeing a normal variation in driver to driver output. I *think* I remember reading that moving the phase plug closed to the diaphragm gets more output and more highs at the expense of lows (the diaphragm hits the plug) and that's part of what Mr. Paul did. Maybe that dB or 2 is the evidence that AlNiCo magnets sometimes need to be recharged. Quote Link to comment Share on other sites More sharing options...
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