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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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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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This time also make shure that the cavities in the two versions, the alnico and the fieldcoil, have the same size and volume of cavities behind the coil in the magnet structure.In this way you make shure that it is the two magnet types you are listen...
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Moreart, somebody sent me this link last year. You are surely the DIY pioneer of back loaded Manger.As you probably know this is a touchy speaker to work with. Rated at 91 dB/W input by the factory, we measure ~91 up to near 92 dB/1W/1m in our two mo...
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I have seen Beyma rewrite their specs when they redo a driver and even add a letter to the driver for that change, even if it is the same driver.Now I have seen variable FS responses form different drivers of the same model also. I was joking with a...
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Decays may not be only from your horn inside mouth ...Try to treat your back chamber(whole area of were your driver radiating sound ) with highly dense materials and use absorbers too.Use acoustic dampers like rubber where your horn mouth contacting ...
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Hello Romy and everyone here, Thanks again for your thoughts on the large horns. It seems best to start a new thread, as previous threads dealing with the "10-Footer" originally began as discussions of other subjects. Romy, you may want to move previ...
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[quote user="Blaukopf"] First, Romy describes his horns as spherical. Later he names them tractrix. Are some of the profiles of the spherical wave profile? [/quote]
Yes, they are spherical, wish means not rectangular. ...
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I told before that I have high respect to Brian Cheney (because of multiple reasons) but I do not agree with his loudspeakers, where he tries to use ribbons wider range then they should be... Brian recently announced his new model VMPS RM V60. Since ...
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Hello Macman,Nice horns, I like that you finished everything properly! I am getting tired of seeing piles of horns.I think the ringing you are getting from your midbass horn is that the throat reactance is not balanced. How did you calculate the ba...
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Romy,If you havent already, why not explore the Infinite baffle concept? Or a long terminated back chamber for that matter.Current drive should also be very good on the lower registers.Rgds, Collin...
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I woke up and thinking about the horn problem with fresh head I am thinking what did wrong. I did not measure the frequency response of the horn – I did not see a need for it – the sound of the thing is way beyond where it needs to be measured. I dis...
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Romy, I think you have neither a system with back chamber now (because the foam is closed pore), nor a "true compression driver" (because the foam is not rigid). Probably you mainly have a second vibrating system coupled to the cone that enhances mec...
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Thanks, Eduardo, very interesting. The YL 75000 has no phase plug and 70Hz with 1” trout. It look to me like a conventional diver. Which beds a question: if to reduce compression with our classic drivers, loose plug off and reduce power then can we ...
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I had a number of discussions about ribbons loading into horns and I generally do not welcome this idea. There are a few reasons why it never work properly and one of the most convincing is that in order to develop enough output from a ribbon you nee...
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[quote user="Romy the Cat"] ygoh wrote: 1.) Why is it that you do not support using teo compression drivers in the same throat? Is the distortions increases, such as wavefront distortion? Sure the wavefront gets spread; it is what Wi...
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I see, this is very different question then you initially posted.
Ironically the subject was discussed years back what I was fighting with S2’s “fuzziness” at very top.
I still do not feel that there are any 'rule of thumb' in it, there are...
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Taming strange fullrange drivers is fun, doesn't cost an arm and a leg and there is always room for a second, third, etc. system. E.g. what to do with such a ridiculous unit? http://www.ciare.com/pdf/catalogo/HX135.PDFBack-loading? No problem when th...
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[quote user="Merlin"] If they are modifying conventional drive units by hand, the labour costs alone can be prohibitively expensive. The fact that they are using heavy Alnico magnets and coating the diaphrams suggests that these units do not co...
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Ronnie wrote (and posted the following image): "...I was thinking the same. But perhaps rubber rings can be used to seal the back chamber to make it instantly tune-able (without the hard foam)..."Romy wrote a thread called the "Practical Guide t...
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Apologies for blurredness: room is very dark hence long exposure times.At listening level. Note the driver is off, hence light at the centre.Side view. Note the larger horn can move in the horizonal plane to time-align it with the S2. Back chamber is...
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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 (gross volume) back...
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Hello , Roma ! I think that you can use only a back chamber with decreased size , and a serial capacitor . I think that there are no ways besides ... Dima...
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[quote user="Romy the Cat"]I see some kind of so called “transmission line” that is fractured from multiple labyrinths where each of section acts as different resonant chamber… then I do not want to hear about “energy releasing and the rest crap.[/qu...
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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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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 walls and joints are not res...
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[quote user="cv"]Regarding what effects the larger horn will have: my gut feeling is that the larger air mass will provide more damping anyway. It may be that there's an optimal bug screen "density" that varies with the air loading?[/quote]This is ve...
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[quote user="guy sergeant"] How would such a time delay manifest itself in the resulting sound?[/quote]
It is like driving a car where one of the wheels is larger size and rectangular.
[quote user="guy sergeant"]Would the benefits of having a hornl...
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[quote user="oxric"]Hi Romy:
I have been following your mid-bass horn project with a mixture of fascination and horror for a little while and am awed by the remarkable amount of creative thinking that has gone into it.
I am sure there is n...
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[quote user="noviygera"]I got this new midbass horn to replace the Edgar 80Hz straight horn. It is made by Funktion-One and they claim it plays down to 90hz. I could not get it to play below 120Hz and I am trying to figure out why.
15" driver....
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[quote user="Murataltuev"] Now it is
clear! Thank you, Romy!Today I auditioned and measured GOTO with closed hole in
back chamber. Mid-bass completely disappeared!
With closed back chamber it works efficiently
only from 200Hz! So, I'm going to tr...
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