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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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[quote user="op.9"] I agree, there is probably very little to learn luthiers that is directly applicable. However, I've always been interested in the similarities between good speaker cones and thin lacquerd spruce. Sort of a crispy pingy sound even ...
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If you ask me the compression drivers is like the jbl 2420/2470 design only with an other back chamber. And the low freq driver really makes me think of an old alnico driver of jbl 2220A http://www.lansingheritage.org/images/jbl/specs/pro-comp/2420/p...
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From what I gather the JBL 2169 driver is an 8" cone speaker with a sealed back chamber. If this is so it was designed for a specific horn. It shall be used in that horn or a very similar one. The back chamber should be tuned/designed for the horn ...
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[quote user="anthony"]
http://goodsoundclub.com/Forums/ShowPost.aspx?PageIndex=1&postID=6011#6011The back chamber is very important...about half of the drivers energy goes back there so it needs to be strong if you don't want it to reson...
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Marcus, I have no idea why Jorge assosiated your resonance with your back chamber volume – they are absolutely not related. Why suddenly you start to talk/think about the back chambers is beyond me. Also, I have no idea what the HornResp does at my ...
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I also disagree. You circumvent the whole theory if compression drivers. The whole point in a compression driver is that anything in back chamber is irrelevant. Haralanov, all that you need to do is to make your own experiments, the practical exper...
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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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The Other End of the Single End: Modern Horns Done With Flare An Interview With Dr. Bruce Edgarby Dave Glackin, printed in POSITIVE FEEDBACK. 1996
Dave Glackin interviewed Dr. Bruce Edgar in his home, prior to the 1996 WCES. A follow-up on the speak...
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Jessie, I have moved your post to your 45Hz horns thread but then decided to keep it here as some of my comments would be about entire system not only about your midbass horn. Anyhow, there is nothing there to laugh and it is pleasant to see that som...
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I agree, there is probably very little to learn luthiers that is directly applicable. However, I've always been interested in the similarities between good speaker cones and thin lacquerd spruce. Sort of a crispy pingy sound even with just a gentle t...
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This there is the last in the “THE PROBLEMS WITH HORNS” cycle. The previous threads might be found at:
Problems with horns: tweeters.Problems with horns: mid-range horns.Problems with horns: mid-range drivers.
This would be probably the most contro...
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Yes, zako, the subject of ventilation and insulation is well-consider. The cathedral roof made well – it has the top ridge raised and vented. In addition I have powerful attic fan running on the other side of house. The heat insulation is another sub...
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[quote user="unicon"]Roman, first of all I feel good about your bass horn that's what i have always bin dreaming and if i get the space for it wont even waste a minute I think you already know it or using it ...You mentioned using a foam in back ch...
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[quote user="js"]Thanks for the reply. I'm using a Jabo KH-55 horn for hf/upper mid, so I think I'll have to experiment with different size chambers. Beyma quote the volume displaced by the driver as 5.5 litres, so I'll start by trying a 9 litre (g...
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Interesting idea. I do not know a lot about pluming and I do not know if 17 PSI is enough. The 17 PSI might be high for continue pressure but what driver does are impulses and I might only presume that in a long run the driver would push the pl...
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I'm a new reader of your website and one subject which interests me a lot is that of upper bass horns.As you have noted time and again (with which I agree almost completely, after reading a lot of 'research' [many claiming to defy the laws of physics...
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Herman, horn dimensions does not described by size of driver but only size of throat. It will be absolutely nothing changed in the horn dimensions if you go from between 10" and 12" driver. Sure you would need a bit larger back side of the horn to ac...
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As I understand they are 110-125Hz horns, they look fine to me. The thickness of mouth I would say a bit too thin but it is trade off as the give horn has no horizontal edge which is better acoustically even though loose slightly visually. There is o...
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I spent some time with my back chamber, trying to drive the driver resonance heighted. I built a sealed sarcophagus as a back chamber (if somebody are interested I can post a picture) approximately 1.5 gallons but it moved Fs for 700Hz. Then I began...
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I did a lot of those experiments a few years back, stuffing the back chamber of S2 driver with all imaginable things. During that time I did not use a dedicated lower MF channels and was concerned only about the S2 top end. I did not detect any diffe...
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Yes, it turned out to be the emails from GOTO importer. I am not completely understood if the horn at the picture above is an official GOTO product. The Ming Su said that the horn was build locally by Jeffrey Jackson with the support of GOTO but then...
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Ming,
I was thinking about this SG146LD4 driver again. They say: 106 dB/ 20 - 500 Hz, 19,000. Well, let look at this a little bit further as I feel that might be very interesting driver.
I admit I never heard about this driver. All that I know abo...
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Wow, Jessie, thanks for the detail deals of your idea. I have spent last evening to contemplate many possible design configurations and I desired to discard all my former ides of metal fine-tuning, even my machinist in on standby expecting my ord...
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Somebody from AA was asking about electromagnet. The subject pup up here from time to time but this time Bruce Edgar uploaded an interesting comment. Bruce is not a typical AA Moron and if he says “inaccurate things” then it is not due to ignoran...
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I was listening recently my Carl Schuricht’s Bruckner and I again noted what I am been noting for a while. I feel like my Midbass horns begin to sound a bit saggy. It is not too but and the degree of change is very minor. It is not even auditable...
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I just love the way this Carfrae looks!I have been tempted to make something similar, but turn it into a front loaded horn (of course), say turn the driver around and add a back chamber on the back of it. Make a nice volume tuning device. And then...
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I had the same problem with my 6 foot, bass horns , which were built from 3/4 inch high density fiberboard. On doing some measurements back then, it turned out that they were vibrating for a few milliseconds after a pulse, giving a decent rise time b...
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[quote user="anthony"]It is a compression driver with an 8" cone. If you want authority at 300Hz you will need diaphragm area. The Fane Studio 8M that Romy and plenty of others use for 100Hz up to 1kHz is an 8" cone driver on a 4" throat with a clo...
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The frequency where your room turns into a pressure chamber changes the way that we perceive bass. This is how we get "bass" in a too small space like an automobile. When removing the ULF channel, all of the music is transmitted in a natural way for ...
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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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