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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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A visitor of my site sent me email with following:
“I take it you don't like the Rogero style (or Johan Dreyer) bass horns with wings, but you could add compression to a similar setup and make it work properly. I have made several design...
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Since the 8M is now no longer to be had anywhere, for love or money (delighted to be contradicted on this), would people care to suggest alternatives for precisely the use Romy puts it to: driving a round, 3-4 inch throat, upper bass horn? I know it ...
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For 140Hz, tractrix, with a 4 inch throat the Fane 8M shall be a good driver. They quite friquntly pop up at German eBay, and UK pro shops have them - at least it is use to be so. If you have one and if you like it then you will fish another one – th...
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I print almost all posts from this site. For last months I study them a lot. I completly suck in by Romy vision of sound reproduction. First I decied to build melquiades amplifier and give it a try with my ob setup. Next step is "horns" I found on eb...
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That's a very motivating thought. I'm in the middle of a 65Hz mid-bass horn; 15" driver into just under 8" throat, blah, blah... "this little mental deception" has me anxious to get back to work on it again. --As if-- everything wil...
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These are clearly JBL pots and back covers (which have been milled flat). The refinishing job is quite nice, but the origins are clear. Also, the phenolic diaphragm is clearly for the 2482/2485 (and looks like a JBL part), which has a slightly wider ...
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The throat diameter of 7" is what I first approximated as an acceptable size, with the 4" being an alternative (should some unwanted effects arise, I may then experiment with the 4" throat). I can't simply assume 7" will be correct (though that...
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It should be possible to find it hidden away in a technical universitys storage room if they have the AES papers. I could not find it on there website, probably they think it is obsolete.The distortion in a horn is generated by two mechanisms: 1. By ...
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[quote user="Romy the Cat"]Actually if that horn would not be bending atop, go for another couple feet vertically, consequentially has a smaller throat and of course has a strong back chamber then it would be a very good J-horn (presumably that the w...
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Herman, I am glad that you feel better about sound from your midbass horns. I do not know what damage digital amps incur but even your experience of hating the sound of those horns to falling in love with them just after changing the amp do suggests ...
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I have a couple of queries relating to the transition from the mouth of the S2 driver to a horn generally, and to a 400Hz or 250Hz horn specifically. The profile calculator that I use for tractrix horn (horncalc) does not take into account the de...
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Dresden, I'm confused-- What is the target low knee? Upper knee? What is the flare rate? Expansion profile? (or T factor -- Hypex, Exponential Tractix, etc). And you want to use one 12" driver? or two in parallel? Or some...
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first post, hi everybody!plan to build a midbass horn around the gpa 515-8ghp, throat 9,9", mouth 24" x 39,37".945something sq inches.(excuse the strange numbers, metric units in europe)crossed at 500, s2 alu diaphr.(is it normal for the metals to ha...
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I never was fan of the Oris 150. They meant be used with Lowther type of drivers, that never worked properly. The Oris 150’s upper bass is not really the bass that might be obtained form the Oris’ mouth. Should this Oris has twice smaller throat and ...
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Thank, Manolis, it did address some concerns. I think I even know what you did with the MF driver. You were able to get 50Hz out of this looks like horn? This is impressive. The boundaries-loaded horns sometimes allow doing away with the horn siz...
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slowmotion,I think the ultimate length of the upperbass horn is 3”- 4” throat. With longer horn it would be very complicated to time-align it as the horn will mask out the MF driver. The ultimate driver for upperbass should be a compression dri...
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[quote user="skushino"] • total horn length (incl. back chamber) shall not exceed 1,00m • the horn shall have conical approximation of a hyperbolic flare contur with m=0.6 • the horn shall have a 5/16 mouth size of a free space horn •&...
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I have written in past about my lack of love to the BMS drivers. The crazy, as far as I concerned “annoyingly wiling” angeloitacare brought this subject to this forum while he was galloping across Web, “picking from graves” about his new dB-Design’s ...
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Thanks Romy. First the amps will be finished and then the Upperbass horns. I may even get the second DSET ready to go upstairs this weekend assuming everything goes well and nothing goes wrong. Will be nice to hear what I have at the moment in ste...
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jezzie i used this formular for throatsize:St=2PIxFSxQesXVas/ci, m very close, my horn is just 2" shorter.it would not be a big problem to make it longer, but in my small room every inch counts.on the other side, if somebody with experience tells me....
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Today I realized that light windows in my horns are before the throat plugs and I can ease to setup the light in the horns. I bough very nice 7W defused light, cold running light sources and mounted them to the light windows of the horns. I can’t say...
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Temporarily seal off the throats from where the driver will mount, stand the horn vertically on its throat and simply fill the cells with paint. Once full, drain the excess back into the paint bucket, by piercing the seal.Alternatively, use a long, t...
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I would not be surprised to learn that the impression of depth from multi-cells is the result of their creating a bit of what has been referred to on this site as the x-factor; a sort of cross-feed/expander effect (see discussion of...
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Ok, I loaded the S3 driver into the new multicells, use my extra of bas sections as a pedestal for multicell, connected 2 extra bass channels to ULF amp and the multicells to full range amps with no crossovers. Yes, I got a VERY good width and th...
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Hi rowuk.Shark skin decreases the formation of vortexes in fluid flows over surfaces and thereby reduces drag.Shark skin resembles fine sand paper and has actually been used as such.Of cource there is a difference between a stady flow around a shark ...
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Romy, thank you very much for very detailed explanation of your horn theory.Let me present some doubts about it. From physics basics when we have more than one springs (suspension, throat resistance, back chamber) we can consider it as one spring. Th...
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Hello Romy, thank you for the answers. Your horns have a round mouth, but their profile is not spherical. That is the profile of the Avantgarde Horns you formely had - apparentyl you have anayzed them intensively, could you elaborate what problems yo...
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This is funny and depressing at the same time. Two readers of my site sent me unhappy emails informing me that my latest posts” “A typical upperbass horn mistake.” was juts my foolishness. Whatever they said boils down to following:
1) They do...
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I was rushing when I made the last post. Wanted to share a little more about my thought process and how I arrived at doing another large-scale masochistic audio project. Making a bass horn is a huge risk - the results can vary from exceeding expect...
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Hi Kodomo-You have made an ambitious undertaking. Congratulations to a brave decision.Can you please elaborate a little on your TAD implementation. I have used one on each side ,in 3 cuft sealed cabinets, first order from 60 to 150Hz, blending gent...
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