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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="haralanov"] Also instead of using electrical tape, try to seal the back of the driver with a 2mm thick sheet of microperforated tonewood and then glue a leather layer over it. Then you could also pierce multiple tiny holes in the leather...
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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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Ok, the attic is all prepared and ready is host the horns. I installed the final 14/50 drivers and put in the first layer of foam. I do not like the result. With the large death of the foam that need it will take for me weeks to pile a layer by layer...
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This is a complicated subject.
While building the horn I would need to know what the size of back chamber to make. Usually the initial size of driver diameter plus two depth works very nice. It makes big chamber that eventually might be minim...
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I do not have a final design of my back chamber. The image above is a concept that I deliver to my carpenter – we will go from there to see what we can do. I certainly would like do not overbuilt the back chamber. The notion of adjustability is very ...
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[quote user="wvdave"] I see this project as enhancing the value of the property…[/quote]
I also see this project to enhance a value of property. If I place in the mouth of my midbass horn some kind of MF/FM driver then I will be able to presen...
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[quote user="Romy the Cat"]I do not have a final design of my back chamber. The image above is a concept that I deliver to my carpenter – we will go from there to see what we can do. I certainly would like do not overbuilt the back chamber. The n...
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ygoh wrote:
1.) What's that formula to calculate the back chamber volume given a throat reactance?
2.) Would it be a bigger back chamber with higher reactance at the throat? or vice versa?
You do not ne...
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Yes, Keith, it is how they usually do with front-exited drivers where the back chamber not vented. Some would put a texture on the plate of magnet, some put felt dampers. It look like then have some kind of indentation in there I have no idea wh...
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Im in the process of building a pair of 115hz MDF horns. Any suggestions, on the size and type of vent for the the back chamber? Ive seen Jessie's implementation but I am pretty sure I will not be able to do that in my situation. ...
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Jp,
what do you mean by “vent for the back chamber”. Why are you planning to make the back chamber vented? The side would be depending from the type of your driver, but generally it will be always smaller then you think.
The Jessie's impleme...
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Miab, I have very limited knowledge in construction techniques, moist prevention and how all of it might affect a big horn. My very uneducated production suggests me that it is not truly a bid deal, but of cause if go this route then I certainly ...
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Here is a picture of my upperbass horn’s back chamber. The actual chamber is approximately twice smaller as it patched internally with construction foam (a wonderful John Hasqiun invention). The dust cap of the driver is where the weight is hangs dow...
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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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[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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It is really a seldom thing in audio – when people ask questions afar they do own homework and demonstrate understating and own thinking on the subject.
Question: Whan bass horn back chamber tuning should be started? &nb...
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Jorge,With the risk of being called a moron, I actually didn´t do any calculations more than using hornresp to get a decent spl-curve.The driver properties a got from a guy in Denmark who renovates old altec drivers. The numbers probably weren´t accu...
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Romy, Is there a consistent effect from too large/too small and how is it analyzed? Working on a new horn that I had turned by a fellow in Hungary and have made my back chamber so that I can easily manipulate the volume but have no idea of what to e...
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Hi all!I have build few horn projects. And i can't figure out how i can get rid off back chamber nasty sound (resonances) (300-500hz region).Horn is 150Hz conical with JBL 2020H driver in 14L cilinder....
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I would like to ask for your thoughts on the importance of back chamber shape and construction. This topic became of interest when I learned that the back chamber of my midrange horn (250hz - 2khz) is noticeably resonating when I put my hand on i...
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A visitor of my site, a guy who never ask stupid question about audio, asked me a question how to find a correct size of the back chamber of a straight upper bass horn that he juts built. I wrote a reply but then realized that it would be worth to up...
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I have posted this idea at the Peter’s Vitavox site a few month back but there is no activity at that site. It sucks that there are no advanced S2 users out there. I am planning to try it myself and in a month or so and will report the result. ...
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Pretend
a driver diaphragm, any driver. From front diaphragm "sees" the horn
throat and the mass of air in the horn that diaphragm needs to
"push". This creates let call front spring. If a driver has a front
chamber than let discard it for now. ...
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what you did in your horn : you coupled your horn and you added mass on cone. then imagine when the cone tried to make an impulse it moves forward and then in back chamber something stops it from moving(air pressure+-) your driver had been stopped fr...
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[quote user="unicon"]what you did in your horn :
you coupled your horn and you added mass on cone. then imagine when the cone tried to make an impulse it moves forward and then in back chamber something stops it from moving(air pressure+-) yo...
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That is exactly what I was counting at and it has happened. Measuring this morning the resonance frequency I saw that it dropped from 43.7Hz to 38.7Hz. That is very very good, though I expected even more drop for a 2-3Hz during next week or two. My h...
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[quote user="Romy the Cat"]The whole point in a compression driver is that anything in back chamber is irrelevant. [/quote]Hahhaha, good joke! :-)[quote user="Romy the Cat"]Haralanov, all that you need to do is to make your own experiments, the pract...
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[quote user="be"]They mention an intricate back chamber for the high frequency unit, maybe thats the primary function of the tube, apart from positioning the unit relative to the rest.[/quote]
I did not read any their descriptions and I do not know ...
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[quote user="Romy the Cat"]Last night Levine and BSO played a phenomenal Mahler 5, truly great play. I had some issues with BSO sound and I probably will bring it up to them. Tonight I decided to listen the M5 broadcast for the first time and I ...
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