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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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Being a musician, I deal with constructive resonance every day. Tubes resonate as a function of length, boxes resonate as a function of the internal length, width, diagonals. Irregular shapes resonate as a function of volume, horns resonate as a func...
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I’ve been thinking about all this electricity stuff…
I’ve stopped using all power conditioning devices since Bush got re-elected, and I consequently left the country to start a new life in the land of 220v/50Hz (this BTW, is not an exaggeration).
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Ronnie,
The stuffing the back chamber in upper bass horn and stuffing a sealed enclosure have totally different purposes. In the firs case we need to decrease volume of the chamber in the second to increase it. The polyurethane foam spray is not foa...
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[quote user="Romy the Cat"]
...this interesting point has no practical answer. First of all in the case of Rakesh horn what N-Set proposed is not necessary. Those 115Hz Hasqiun-style horns that Rakesh emulates are well dumped with own mass and own ...
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Hi Romy, I ended up using a TAD 1101h 11 inch driver, 97db, 38fs, and is what I believe a stronger cone than the Goto 8 inch. The DIY mid bass horn is a 1/2 space 53hz hyperbolic horn with 5in x 5in square throat. Length is about 8'6", height of mout...
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It was interesting, educational and in way embarrassing. Last night I send the directions to my carpenter to redo the third section in accordance to the original plan where the opening of the sections is more consistent. This morning he took the thir...
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The horns are painted with final coats. 240 feet of superb 6ga cable laid out to connect the horns (on the picture below). The sand bags sealed. The final bridges on the attic are built. The horns are almost ready to move up. I just need to hang the ...
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Looking at phase 3, one of the first things that pops out is the following:Skushino wrote:"...75-240Hz [from a] 12" x-driver [loaded into a] 70Hz [horn with an] 8" throat..."Because they are a royal PITA to make, you'll want to give yourself every ch...
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This project started in 2007 as an attempt to demonstrate that drivers different from the widely accepted low-Qts ones could be used in a back-loaded horn enclosures.Visaton BG13P, a cheap and easy-to-get (at least in Europe) driver was chosen, basic...
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My mood swings around this Remedios project are remarkable. Literally a few days ago I meant to trash the whole things and start from scratch and now I again am super enthusiastic, unhealthy enthusiastic. Paul was right to fix 6-in baffle will be pa...
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Nope, it was not a joke. For sure it is not the “whole point in a compression driver” but it is very much derivative from the compression driver design and anything that a compression driver has on back is irrelevant and impact only resonance frequen...
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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,you did not disappoint my expectation in your reply. Who can argue with the take: "bugger off and do some home-work"? On the other hand, when looking through that "Knowledge tree TM" it's more of a "forest" as far as horns are concerned. So it's...
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Thanks, Jessie. I just will buy that Beswick Engineering valve, it looks like it is the right size and it look like it will do what I need
I made some experiments applying large gaskets to cover of the back chamber. I used a gaskets up to 12 mm but ...
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Thanks for the recommendations on crossover points and the image of the rear chamber on your Upper Bass horn...
I've been back into some virtual modeling of this large horn (having made one quite nice MF horn, I've proven to myself that I have no...
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[quote user="ayebee"] The horns that Stereo Lab make are very good, especially considering the relatively modest prices. I bought the "Ultra-Fi" version of the 140Hz horns and they are of course not completely free of resonance ….Present system consi...
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jd, I cannot see any of PDF files, probably my current networks kills them.
I do not know the AK150 drivers. I know AK157, AK151 and K15/40. If they have significantly lower free-air resonance, at 30-35Hz then I am not sure that they would be ...
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I recently completed some upper bass horns which I'm now enjoying very much. Sadly I lack the skills of someone like Jessie so my efforts are crude in comparison, but they are working well for me which is the main thing.I already had some old frontlo...
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This is the text that John posted a few years back at Triode Mafia. John allowed me to post it here warning that he have learned more about tapped horn since then and hat his opinion might have changed since then. -- *****************************...
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Guy, here some unconnected comments that you might find worth considering. They are in no order or importance, just random thoughts.
1) Talking and describing about horn we shall always mention at least 5 mandatory characteristics
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[quote user="Romy the Cat"] I have to admit that since the torch of sane sounding horn-loaded loudspeakers nowadays in my hands (among the outspoken people with web presences) I feel sort of an obligation to comment about new interesting species ...
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Ronnie,
I’m sorry I was not able to detect the clipping you were taking about listening your file. However, if you can hear ANYTHING distorted at 1kHz (when ONLY your upper bass horn is playing) then you might consider the following: it has NOTHING ...
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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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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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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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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="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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[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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