bhendrix Posted March 22, 2017 Share Posted March 22, 2017 Does anyone have the network schematic for the JUB/75? (DE75 on 402) Thanks Quote Link to comment Share on other sites More sharing options...
rigma Posted May 17, 2017 Share Posted May 17, 2017 Bump Quote Link to comment Share on other sites More sharing options...
Paducah Home Theater Posted May 17, 2017 Share Posted May 17, 2017 Roy confirmed with me just yesterday that he does not have a passive jubilee schematic for the K-691 (DE-75) and it will take awhile to come up with one. Quote Link to comment Share on other sites More sharing options...
Schu Posted May 25, 2017 Share Posted May 25, 2017 How different is the 69 and 691? Quote Link to comment Share on other sites More sharing options...
jwc Posted May 25, 2017 Share Posted May 25, 2017 Hmm. I have an extra pair of DE-750....how different is that? Quote Link to comment Share on other sites More sharing options...
jwc Posted June 1, 2017 Share Posted June 1, 2017 Looks like there is a "difference" in the discontinued DE75 and the current DE750 DE75PTN.pdf DE750TN-8.pdf Quote Link to comment Share on other sites More sharing options...
mikebse2a3 Posted June 2, 2017 Share Posted June 2, 2017 You can definitely see the effect of the shorting copper cap of the DE750TN. Would have helped if they had listed the horn used with the DE750TN to know if that could also be a variable when comparing their test data. I'm also curious what if anything else is different between these drivers. miketn Quote Link to comment Share on other sites More sharing options...
Chris A Posted June 2, 2017 Share Posted June 2, 2017 After curving the K-691 driver recently, I can say that last octave is problematic. It is the difference in sound in that last octave that is the difference in the sound of that driver from say, a TAD TD-4002 or a Faital Pro HF20AT. If you look at the impedance plot differences, I believe that you will see that clearly. A recently run spectrogram of that driver on "new" K-402 (EQed flat) taken at 1 m and at nominally 94 dB: The overall EQ differences are most dependent on that last octave, and it is the source of most of the work in trying to EQ it flat, IMO. That 14.8 kHz "ringing" is a pretty big deal, and I don't believe that the damping ratio of the two B&C drivers (DE75, DE750) will be that much different, i.e., regardless of relative SPL on-axis at that frequency band, they will probably sound quite similar. Chris Quote Link to comment Share on other sites More sharing options...
mark1101 Posted June 2, 2017 Share Posted June 2, 2017 Haven't you said in the past the K69 also had a 14Khz ring? Different driver and manufacturer? Same issue? Quote Link to comment Share on other sites More sharing options...
Chris A Posted June 2, 2017 Share Posted June 2, 2017 I believe that I mentioned that the K-69-A also has a 14.8 kHz diaphragm breakup mode ("ringing"). That's a P.Audio driver (Thailand), not a B&C driver (Italy). I've never had a "K-69" driver in my hands to test at home. The Faital Pro HF20AT (titanium diaphragm 2" compression driver) doesn't seem to have that issue, at least not in my measurements. Chris Quote Link to comment Share on other sites More sharing options...
Paducah Home Theater Posted June 24, 2017 Share Posted June 24, 2017 On 6/1/2017 at 10:48 PM, mikebse2a3 said: You can definitely see the effect of the shorting copper cap of the DE750TN. Would have helped if they had listed the horn used with the DE750TN to know if that could also be a variable when comparing their test data. I'm also curious what if anything else is different between these drivers. miketn If I remember right, the surround on the DE-75 is actually mylar with a mostly titanium diaphragm, while the new DE-750 is 100% titanium, there is no mylar. Quote Link to comment Share on other sites More sharing options...
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