moray james Posted April 7, 2015 Share Posted April 7, 2015 I am wondering if any of the Hornresponse and other computer simulation design programs users might be able to help. The original driver that this horn was designed for was the University 315w which no longer is built and for which there are no T/S values. Would it be possible to work from the horn profile and establish driver parameters? Fs would bee between 45 -50 Hz or so. I have also attached drawings for one of the horns versions both are very similar. Thanks for any help. This horn is said to equal or better the Khorn and it is a simple build more importantly it has a very wide bandwidth and is suitable for two way use with a horn. Best regards Moray James. University Classic Flare Analysis_Classic.pdf Quote Link to comment Share on other sites More sharing options...
djk Posted April 7, 2015 Share Posted April 7, 2015 http://www.geocities.ws/loudspeakerguru/CorrectedUniversityClassic.gif http://www.geocities.ws/loudspeakerguru/UniversityClassic.jpg 1 Quote Link to comment Share on other sites More sharing options...
moray james Posted April 7, 2015 Author Share Posted April 7, 2015 Dennis: thank you very much for posting. Do you remember the assortment of drivers which worked well in these? There was a range heavier cones worked better for low extension lighter cones for more extended response. It would be great to establish a list of modern and available drivers which will work well in these horns. Any remembrances and comments would be most welcome.There seems to be a fair bit of interest so far. Best regards Moray James. Quote Link to comment Share on other sites More sharing options...
moray james Posted April 7, 2015 Author Share Posted April 7, 2015 DJK: can you comment on the corrected drawings? what was the story behind that? Given the cavity volume would this be a good candidate for a plenum drive system? Best regards Moray James. Quote Link to comment Share on other sites More sharing options...
Marvel Posted April 7, 2015 Share Posted April 7, 2015 I believe those are off of Jeff Robinsons' pages. He had/has info on a few different horn systems. Bruce Quote Link to comment Share on other sites More sharing options...
WMcD Posted April 7, 2015 Share Posted April 7, 2015 TS parameters http://zobsky.blogspot.com/2008/10/theil-and-small-parameters-for.html WMcD Quote Link to comment Share on other sites More sharing options...
moray james Posted April 8, 2015 Author Share Posted April 8, 2015 (edited) thank you William that is very helpful. Best regards Moray James. Edited April 8, 2015 by moray james Quote Link to comment Share on other sites More sharing options...
grindstone Posted April 8, 2015 Share Posted April 8, 2015 from an old SB Avg series Avg parall 60.25 60.25 Fs 6.11 1.525 Re 18.55 7.565 BL 0.195 0.295 Qes 3.4 5.3 Qms 0.245 0.245 Cms 250 250 Vas (L) 0.26 Lvc (mH) 0.17 0.17 Rm Quote Link to comment Share on other sites More sharing options...
djk Posted April 8, 2015 Share Posted April 8, 2015 Neither of the T/S numbers presented could possibly be correct. Quote Link to comment Share on other sites More sharing options...
moray james Posted April 8, 2015 Author Share Posted April 8, 2015 Neither of the T/S numbers presented could possibly be correct. Could you please provide a working set of values or some serviceable drivers so we can correct errors in the thread? Quote Link to comment Share on other sites More sharing options...
Edgar Posted April 8, 2015 Share Posted April 8, 2015 (edited) Here you go. Response graphs in the lower tier correspond to input parameters in the upper tier. EDIT: See post #23 for revised graphs. Edited April 9, 2015 by Edgar Quote Link to comment Share on other sites More sharing options...
Edgar Posted April 8, 2015 Share Posted April 8, 2015 You know, the Classic has an internal volume of 442 liters. In the same volume you could put 3 Eminence Sigma Pro-18A-2 woofers in a vented box, or 5 in a sealed box, and get similar 100+ dB performance with a much easier build. Just food for thought. Quote Link to comment Share on other sites More sharing options...
moray james Posted April 8, 2015 Author Share Posted April 8, 2015 thanks Edgar: these sims were done for the Classic. This is fantastic. The Altec 515 sure looks nice. Big step forward for this thread data to provide insight into new available drivers for the University Classic and the University Dean. Quote Link to comment Share on other sites More sharing options...
Edgar Posted April 8, 2015 Share Posted April 8, 2015 thanks Edgar: these sims were done for the Classic. This is fantastic. The Altec 515 sure looks nice. Big step forward for this thread data to provide insight into new available drivers for the University Classic and the University Dean. You're welcome. I'm not certain that the Altec/GPA 515 will fit -- it's a 16" driver, and the woofer enclosure is only 16.375" wide. Quote Link to comment Share on other sites More sharing options...
John Warren Posted April 8, 2015 Share Posted April 8, 2015 (edited) The C15W does have a high Fs near 60Hz. The surround is molded paper, it's not an accordion pleat. It has virtually no "flex". That said, it doesn't do the horn justice. When Qman built his Classics he stuffed them with K33Es. He was pleased. https://community.klipsch.com/index.php?/topic/12278-q-mans-university-classic/ Edited April 8, 2015 by John Warren Quote Link to comment Share on other sites More sharing options...
djk Posted April 8, 2015 Share Posted April 8, 2015 "Could you please provide a working set of values or some serviceable drivers so we can correct errors in the thread?" I don't have them. My comment was that the math didn't add up, and that neither of those posted could possibly be correct. I'll do some more searching and see if I can find something that looks correct. Quote Link to comment Share on other sites More sharing options...
WMcD Posted April 9, 2015 Share Posted April 9, 2015 http://www.ebay.com/itm/2x-University-Sound-C15W-Woofer-50-Watts-/181709553437?pt=LH_DefaultDomain_0&hash=item2a4ebbbf1d Interesting. WMcD Quote Link to comment Share on other sites More sharing options...
xrk971 Posted April 9, 2015 Share Posted April 9, 2015 Hi, First post here - Moray James asked me over in diyAudio to take a look at the University Classic and reverse engineer the driver parameters. I have built the Akabak model with all the turns and expansions and contractions - this horn is super efficient, with a decent driver it can make 130dB+ at xmax but problem is the tuning frequency is a modest 75Hz. I find it rather tolerant of different drivers and certain modestly priced modern pro audio drivers can really make it rock. I will post results tomorrow. There is a very simple mod that will take this down to 60Hz without too much loss of sensitivity. Cheers, X 2 Quote Link to comment Share on other sites More sharing options...
djk Posted April 9, 2015 Share Posted April 9, 2015 90% of the performance of any horn loudspeaker is the horn itself, not the driver. The higher the mass corner, the higher it will go. In general, high mass corner drivers have low x-max. Pick the driver with a mass corner a half-octave lower of where you want to cross it at (for better maximum bass output). Quote Link to comment Share on other sites More sharing options...
The Dude Posted April 9, 2015 Share Posted April 9, 2015 First post here Welcome, and thanks for the info. Quote Link to comment Share on other sites More sharing options...
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