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mikebse2a3 Posted April 21, 2013 Author Share Posted April 21, 2013 AES Paper AES-Jubilee-pdf.pdf Quote Link to comment Share on other sites More sharing options...
PrestonTom Posted April 21, 2013 Share Posted April 21, 2013 Mike, Thanks for getting together with Roy and making this fact sheet on the Jubilee bass bin. It is an important source of information and also has an archival value. I hope the thread does not become corrupted the way the fact sheet for the HF horn (K-402) did. Keep up the good work. -Tom Quote Link to comment Share on other sites More sharing options...
Daddy Dee Posted April 21, 2013 Share Posted April 21, 2013 Mike, thank you for getting this together. one thing i'm wondering about is the PEQ filter. obviously has a substantial impact on the low end extension. could you (or others) say more about the PEQ filter? not sure how this works. any thoughts appreciated. Quote Link to comment Share on other sites More sharing options...
mikebse2a3 Posted April 22, 2013 Author Share Posted April 22, 2013 Your welcome Tom and as I have said before Roy is the one who deserves the thanks for sharing all this with us. Quote Link to comment Share on other sites More sharing options...
mikebse2a3 Posted April 22, 2013 Author Share Posted April 22, 2013 Daddy Dee thanks for asking. The LF PEQ values for extending the Fc of the system are: PEQ Freq= 32Hz, Q= 12, Gain= +7db Basically Roy has implemented a modest electrical drive increase in this narrow frequency range because the Jubilee's Horn/Drivers design are very low in distortion in this region when corner loaded while also having a high spl output capability for the Jubilee LF system and again note especially this has been accomplished while still maintaining a very low distortion for the system. The PEQ filter can be implemented in either active crossover or passive crossover implementation of the Jubilee as long as one has an equalizer capable of the parameter settings given above. mike tn Quote Link to comment Share on other sites More sharing options...
bracurrie Posted April 22, 2013 Share Posted April 22, 2013 Thanks Mike for gathering and posting the Jubilee information. Did Roy develop some other PEQ tweaks for the LF? There have been threads that mention several more than just the 32Hz PEQ. Quote Link to comment Share on other sites More sharing options...
Daddy Dee Posted April 22, 2013 Share Posted April 22, 2013 Thanks Mike for saying more about that. i'm such a non tech type, but am sort of getting it. :-) makes sense. it's a cool thing that this can be done with the Jubilee Quote Link to comment Share on other sites More sharing options...
Chris A Posted April 22, 2013 Share Posted April 22, 2013 Did Roy develop some other PEQ tweaks for the LF? There have been threads that mention several more than just the 32Hz PEQ.Brad, I haven't seen anything more from Roy on this subject other than the PEQs used in conjunction with the 400-450 Hz Dx38 crossover settings in order to achieve a steeper effective crossover slope than 24 dB/octave (Linkwitz-Riley). Those extra PEQs listed around the crossover frequency are for that purpose, IIRC.The 32 Hz PEQ boost is something that I initially proposed from my experiences at home using a very similar PEQ boost filter...believe it or not. Roy patiently listened to my arguments then tested his preferred settings in the Hope chamber. It was there that he found that the increase in distortion was minimal. The other bass bin PEQs that I've listed in-room are also derived from my in-room test and measurement experiences. The latest settings that I posted last fall are ones that you already have access to, and are what I gravitated toward after getting my tapped horn subs built and setup in-room. I'm now about to embark on another Behringer DEQ2496 exercise using both the expander function and miketn's "Cello" EQ filter setup for the DEQ2496 to try to compensate for any poor recordings that I own, which includes mostly pop and rock recordings, but also a small number of jazz and classical recordings, too. I also intend to try out the Yamaha SP2060 (2-in, 6-Out) that has extra PEQ filters than the Dx38's capabilities. But that exercise will have to wait until this summer to try out. Chris Quote Link to comment Share on other sites More sharing options...
bracurrie Posted April 22, 2013 Share Posted April 22, 2013 AES PaperIn section 5.2 of the AES paper the horn length is cited at 3.378 m. Table 1 Flare Rate Analysis has a table of lengths that add up to 2.352 m. I am not an audio engineer, but would still like to understand what the horn length in section 5.2 refers to. And for the purposes of caclulating the delay what LF horn length do you use? The reference to rubber throat in the fact sheet threw me until I read the AES paper. Is that term used by speaker and/or horn designers? Quote Link to comment Share on other sites More sharing options...
Deang Posted April 22, 2013 Share Posted April 22, 2013 Thank you Roy. 400wpc. Is that enough for around here? Quote Link to comment Share on other sites More sharing options...
thebes Posted April 22, 2013 Share Posted April 22, 2013 Thanks for posting this Mike. A very well thought out series of questions. I think it once again proves that Roy Delgado is not only one heckuva an engineer, but his partnership with Mr. Klipsch on the development of the Jubilee was akin to that of Bell and Watson and their work on the telephone. Quote Link to comment Share on other sites More sharing options...
WMcD Posted April 22, 2013 Share Posted April 22, 2013 The 3.37 meters is the length of a horn of similar flare and throat IF it is designed to work in free space. It is just to show how much shorter the horn can be if designed for a corner. This requires a bit of a close reading, I'll admit. The figures for length in the table are cumulative length. It is saying, if we measure to B it is so much from A to B, and to point C we have so much from A to C, and if we go to D it is so much from A to D. The table calculation for flare is based on the cumulative distance from A to the point (B,C,D) and the area at A and the area at the respective points. The table does not appear to show the flare rate between B and C and C and D. It happens to show the flare rate from A to B because while the distance shown is cumulative, we've started from zero. At least that is my read. WMcD Quote Link to comment Share on other sites More sharing options...
WMcD Posted April 22, 2013 Share Posted April 22, 2013 The total length is the 1.4 meter figure and that would be a starting point to figure delay. WMcD Quote Link to comment Share on other sites More sharing options...
Moderators dtel Posted April 24, 2013 Moderators Share Posted April 24, 2013 Thanks Mikebse, and of course Roy D. [Y] Quote Link to comment Share on other sites More sharing options...
DrWho Posted December 7, 2013 Share Posted December 7, 2013 Interesting info about the splay... Quote Link to comment Share on other sites More sharing options...
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