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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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Romy,
Thanks again for your comments.
The RTA and filter mods over the past few days have driven me straight up to the local café to chill out; they have WiFi here (this being France, still no internet at the house)... I will be brief.
Regar...
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Ok, it turned out that I had all caps and coils "in stock" necessary to adjust the filters very close to Romy's recommendations.Its still not perfect, and I had the mic 1m from the membrane of the driver (had not yet rea...
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Romy wrote :"...And with 1600 pound per channel you might forget about the DPOLS … -..."No, 1600 lbs per channel would be really serious! 1600 lbs is the total combined weight of the Left and Right channels, with frames, (the frames turned ...
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Well a scepter or a baton... Last night before setting up the RTA, I listened to a recording of orchestral works from Strauss (Kempe conducting)... It was early enough that I could "air out the system" a bit. And Ok, maybe I don't have all ...
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Romy, thanks for your thoughts,Quotes from Romy in blue : "...I personally do not feel that you use Fundamentals Channel properly. You desired to run your Fundamentals Channel up to 3200Hz but it is too high..."Maybe, probably, yes, OK, I a...
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Ok, I have been experimenting with placement : Long wall versus short wall. Though the frames have wheels and roll very easily, my room is cursed with an elevated platform smack in the middle of everything (about 14 inches higher than the main floor)...
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Klaus,Yes, I assumed that you had found the spec sheet; I only included the link for the convenience of others following the thread.Klaus wrote : "...whats wrong with 9,9"? its rougly 55% of sd? you think, 43" is too short for a 62hz h...
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Hi Klaus,
Spec sheet on the bass driver you plan to use here: http://www.greatplainsaudio.com/downloads/515_G.pdf Just to be clear, mid bass to me means from 60Hz - 240Hz.
Throat diameter : 9.9 inches ?I'm just a beginner, ...
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Romy wrote : "...The horns that you made are elegant and graceful but painted in glossy black with that very rough structure I feel they are less attractive. The texture surface is good but I think that the sophistication of the epoxy-sand mix i...
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Here are a couple shots of the finishing process. Foreground : Pair of 180Hz hornsLeft : Halves of a 115Hz hornRight : Pair of 400Hz hornsNear the center of the above image there is a rectangular box of sand... This sand is w...
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Thanks Romy and Paul for your comments.
Romy wrote : "...I personally would probably go for a monopod frame above the upper bass horn (merging it in middle) as I feel it make the architecture more elegant, more airy and visually less deman...
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And now, going back to page 2 of this thread; here we pick up with some shots of the upper bass horn and the associated primitive "tooling"Mold without coreMold with core. Before core is put in place, mold is loaded with a thick coat o...
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jd wrote : "...While I'm at it, here is another attached image showing the core..."Well its been a long time since I've posted photos of the project... I'll be doing that now.To start off, I noticed that the link to a previously availa...
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I've been thinking; rather than placing the mid-bass horns off to the sides or above the rest of the horns as in the first two images below (a CAD model of the horns in my new place); a plan which implies accepting imperfect time alignment...Ori...
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Hello Paul,If I were to come across such a thing, I would not say no to a little experiment with a driver that used a neodymium magnet.All drivers I've been trying lately use AlNiCo magnets... Compared to some of the other dr...
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Romy wrote :"...Years ago when I researched the subject of the drivers for my UpperBass horns and when I was trying many alternatives..."And in the Warfdale thread :
"... I had in past a few Goodman drivers but I was looking very different thin...
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Just thinking about it, it seems that in order for the sealant (silicone?) to adhere to the inner wall of the tube, the sealant would have to be applied to a tube that has not been in contact with the damping fluid, especially if that fluid is petrol...
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Romy's quotes in blue :"...Discussing the Jessie project we multiple times mention the idea of the large midbass horn hanging above MF section... The rational was to have it positionally contra-react the output of the upperbass horn... But do we au...
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Jessie wrote :"...In the case of the system I am building, one can happily sit straight in the firing axis of any of the horns without experiencing the above-mentioned unpleasantries... No cringing (and this while using the older metal diaphragms). T...
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Romy wrote :
"...do not forget also while you do your alignment experiments to listen the system from different distance. Get a reference whatever it is and then make a step back and a step forward... You might eventually found a distance from where...
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Quotes from Romy in blue :"...If you are not in very large room and your bass section are not 90dB sensitive then take one of yours left ML2.0, bring it to right channel and drive with it the right’s channel bass system instead of M1.1. It will ...
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Romy wrote :"...do not forget that if you made the dramatic-enough angling then in order to preserve methodological purity of experiment you need to attenuate slightly the angled horn and it will most likely output more dBs to a listener located on a...
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I.M. Distortion wrote : "...#1 from were you listen to system from you should be able to look down the throat of every horn in your system..."jd wrote : "...Hmmm......
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I.M. Distortion wrote :
"...From were you set put a ladder tye a string to it were your head was 15 feet long, go to your horns that is 1000 hz and above put the string threw it go threw the back of it take your driver off measure to the back plate ...
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Field coil drivers, the next wave : Yes, brilliant indeed! The time is very right for such an "evolution".
And, we can hypothesize that it might have been so... Had Romy not posted this prediction.
However, in so doing, Romy may have just short ci...
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Romy wrote :"...How about the parallel-ness of the axis?..."Simple : All your horns were turned on a lathe... This means that if you place a straight beam across the mouth of each horn, in each case the beam will be perpendicular to&nb...
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Romy wrote :"...The table on the picture above is very good but it is $180 each. It will be my way out if I do not found anything beter..."Romy,
$180 does not seem expensive for such a table; for that price it is likely to have been "Made in China",...
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Romy wrote : "...I know, it is kind of contra-intuitive to kill output of antenna to get better sound. But I learned that I need to do it... BTW, if anyone knows where the source a 75Ohm 0-40dB (not 20dB) LPAD with coax input and output cables going ...
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Antonio J. wrote :
"...I'm using an indoor antenna which in fact is a small car antenna, placed besides a window. The good part is that I can move the antenna and get the orientation that yields stronger signal. I'm living in an 11th floor in a buil...
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Thanks for the thoughts on driver impedence.
Romy le Cat wrote :
"... I discovered Fane 8M in 2000 when it replaced the AG Trios upper bass driver and at that time I used Lamm 2.0 to drive all my upper channels..."
Do I understand correctly ...
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