STL Posted August 15, 2012 Share Posted August 15, 2012 I have three complete K-57-K midrange horns (let's call them 11, 22, 33). Here are measurements from them: I also have two additional diaphragms (let's call them A and i). I placed them in the horn 1 and took the following measurements: I am hoping that someone can tell me (from these measurements) which diaphragms look good and which ones look bad/suspect? While the first three diaphragms look similar, they all sound different (in level and in tone). I have not listened to the two newest diaphragms (that's A and i) much yet. Quote Link to comment Share on other sites More sharing options...
STL Posted August 15, 2012 Author Share Posted August 15, 2012 This is somewhat of a follow-up to this old thread: http://forums.klipsch.com/forums/t/39263.aspx (for some reason my link option was greyed out) Quote Link to comment Share on other sites More sharing options...
Guest " " Posted August 15, 2012 Share Posted August 15, 2012 your config shows a low frequency limit of 5hkz and an upper limit of 20khz.....this is a mid driver so low limit should be 600hz and upper limit should be 5khz Quote Link to comment Share on other sites More sharing options...
STL Posted August 16, 2012 Author Share Posted August 16, 2012 The low on the graph is 5Hz not 5kHz -- so this low level sweep covers the operating range of the driver (which I was aware of). Quote Link to comment Share on other sites More sharing options...
mungkiman Posted August 16, 2012 Share Posted August 16, 2012 Did I miss the question? Quote Link to comment Share on other sites More sharing options...
Guest " " Posted August 16, 2012 Share Posted August 16, 2012 Did I miss the question? I think he wants to know why the old ones are higher in impedence than the new ones.....things like fractures in used coil leads and hardening of the diaphragm increases the numbers Quote Link to comment Share on other sites More sharing options...
STL Posted August 16, 2012 Author Share Posted August 16, 2012 Did I miss the question?Here is what I said:I am hoping that someone can tell me (from these measurements) which diaphragms look good and which ones look bad/suspect? While the first three diaphragms look similar, they all sound different (in level and in tone). I have not listened to the two newest diaphragms (that's A and i) much yet. I think I might have an explination for the difference (between 11/22/33 and 1A/1i). I know the A and i diaphragms have aluminum formers for the voicecoils, and I believe the 11, 22, and 33 ones are all kapton former units. That said, I found some notes from testing I did awhile back with a handheld B&K Precision 875 LCR meter (that tests at 1kHz I believe) that makes me wonder if one of the motors is actually bad! I saw Re values between 23 and 13 ohms and Le values between 1 and almost 2 mH (when each diaphragm is bolted into the very same K-52-K motor). All five of the voice coils measured about the same resistance wise, coming in at about 11 ohms, when measured NOT in a motor. I suspect it has something to do with where the coil sits when at rest in the gap, but would have expected there to be a tighter tolerance on this. I could tell a very distinct volume (and even tone) difference between the 23 and 13 ohm diaphragms -- and both of those are kapton former models! I also have three different K52K motors and they all seem to sound a bit different (with low volume testing with no filters) -- can this normal? Quote Link to comment Share on other sites More sharing options...
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