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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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It was an interesting event today. I have a big air compressor home that got broken, so I borrowed a portable electric compressor from my neighbor. I plug it in outside the house and blew up the irrigation system, preparing it for winter. Then I bro...
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[quote user="mats"]Good start Dan!The JBL phenolic 2" driver is 2482.I would lower the crossover point as far as you dare, 300Hz or so.Now the 2226 will do what they are pretty good at.Later you will likely want to filter the 2445 around 2k.A 600Hz h...
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Something they mustve obviously done better than others using beryllium. Judging the sound. In a positive way. The lower 3 are titanium, but all upper 3 are 4/3/2 inch BE sourced from truextend. The suspensenion however is soft and allows excursion.I...
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[quote user="Romy the Cat"]Folding introduce a bunch
of resonating chambers and cost audio coloration in most of the cases that do MASK
OUT the transient dynamics but folding itself should not have an impact to dynamics
itself.[/quote]Might be the...
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Josh, I am not sure what you want to say. If you looking to name the reason why you like the sound of Gotos then you are guessing as much as anybody else. I can tell you even more. I very confident that the Goto folks themselves are guessing. I do no...
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Hi Daniel. I mean the window, after you sweep 10 seconds, and fuzz shows the IR. You can change the IR windowing on the preferences panel... like crop/cut the analyzed part of e.g. 1ms before the peak and then duration X behind the peak (here i asked...
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ah come on guys. Measures have to be understood properly. U can’t judge every tiny pixel. And also you cant say a tilt here will sound bright or dull, coz your room can change this. Ok. Doesn’t mean everything is upside down either. Doesn’t mean, if ...
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Romy,
Thank you for your response. I am trying to figure out this horns and I did additional measurements. The phase plug is an interesting part of forming of the the horn throat expansion and because it is quite big and so looks like it is al...
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Romy,I understand your situation as a result of the move. It is a good thing because a system that is out of proportion with not work in a family environment and ultimately you will be battling yourself between sound and family priorities and practic...
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My main 6 speakers are modified Edgar horns with 105 dB/ watt sensitivity, and the others are overhead emotive speakers with standard 90 dB/ watt sensitivity. There are two JL self powered f12 subs, and 4 self built subs with a sherbourn five channel...
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Ah, Amir, did you consider ever that amount of pp generators can create a critical mass of them which advertly affects sound? With all seriousness I hope you do not use the bulk of your generators in the same environment at the same time. I impor...
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Dear Malinowski,The basic idea for phase plugs is that the sound from all points of the diaphragm should arrive to the throat at the same time. For the midbass horn we only used a simple one slit plug. If you feel up to it you could make a more...
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Here is an image depicting the radiation pattern of the HF for a midbass with and without phase plug. The dotted line represents the HF output. This is not a measured response!Here are a couple of pictures that may be amuzing. My girlfriend and the s...
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Not to be too presumptuous but i thought i'd start a thread that could serve as a repository for lowther comments, ideas etc.the impetus for this was that rola experiment i mentioned in the cogent rmaf thread. I was thinking hmm, 'hard', 'shouty' tha...
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I have seen those old Telefunken, Siemens and some other 4” cone direct radiation tweeters, but I never tried them. I do not know thier signature and I do not know thier characteristics. The reason why I never cared about them, although I might be wr...
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Unfortunately its $1000,- total... Its not fixed, i can still do alot with that though.Alnico is better but only available in vintage drivers right? How does neodymium compare?The Jbl's seem to fall off fairly quickly. I dont need flat to 20K b...
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In reply to those who asked me to post the detail pictures of the Vitavox S2’s phase plug.
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"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." Is this also why you use tractrix curve for expansion? To shorte...
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The first two prototypes is actually one build, the only difference being the volume/area of the chamber. (Perhaps I could have chosen more proper words in describing this part of the horn. By 'volume/area chamber', I'm specifically refer...
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Since no one replied, I thought of narrowing down the problem. I need to make a horn that will cover up to 600Hz. I will guess that it will be 150 to 600Hz. But better yet 90 to 600Hz. Is this posssible. Do I need to make a compression chamber? Do I ...
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Haralanov, I've spun this thread off the "Speakers for a Powerful SET" thread, as you suggested. I took a couple of pictures, but I can't figure out how to upload them, just yet. I'm also not sure what you could see from the outside, anyway.As for th...
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[quote user="Paul S"] I took a couple of pictures, but I can't figure out how to upload them, just yet. [/quote]Hi, Paul. Take a look here http://www.goodsoundclub.com/Forums/ShowPost.aspx?PostID=1120 [quote user="Paul S"]I took out the phase plug, a...
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Zako, you might enjoy the thread about the evils of hysteresis induced by output transformers, where the (so-called)absence of output transformers is supposed to be the "solution". In any case, your posts remind me of this gambit, more than a little...
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Romy!Put on an engineer hat!
Time-aligned is an impossible task from my point of view. How can one perfectly time align different drivers? Align to what precision? mm, inch, cm or ft? 5%, 10%, 30% time align? Align to the tip of the cone or...
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[quote user="MINGSU"] Time-aligned is an impossible task from my point of view. How can one perfectly time align different drivers? Align to what precision? mm, inch, cm or ft? 5%, 10%, 30% time align? Align to the tip of the cone or middle of the...
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All below is written by Thomas Dunker
Yeah, "sound consistent independent of signal level" is a very precise way to sum up my whole speaker philosophy. Anything that is assumed to be constant, but which actually changes with signal dynamics is what ...
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Hey Romy,
One rather simple acoustic solution would be to use a quarter wave
stub. This is about the closest acoustic analog to an electrical notch
filter. I believe JBL used this trick in their 'Aquarius' speaker
to remove a peak in the ...
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[quote user="cv"]This is but one reason why I'm asking Martin Seddon to make me a pair of 160Hz horns...[/quote]Another problem….
Chris, be carefully with those large 160Hz horn and S2. The guys who make then have no instruments to center the mounti...
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I had today the “fundamental channel” plug in and was trying to listen it. As usually I do, I connected juts one single crossovered “fundamental channel” to a single amp and try to live with it for a while. It usually takes for me a week or so to fig...
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Dear Romy,
well the horns are actually not designed for HF. The intended working range is up to 5-700. But since we use low Q, only second order filters we want to have a rather large overlap in the crossover region and a fairly even pattern over ...
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