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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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Very nice!What about asking your carpenter to leave a nice neat 5mm joint, letting the edge of the horn remain independent from the sheetrock wall?Alternatively, you could use white plastazote foam; closed-cell, easy to cut and easy to paint (very co...
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Scooter wrote: "...I have seen silicone and other petro-based products in contact (or proximity via vapors) to cause certain foams to break down over a period of several years. They might have a similar negative impact on driver components and bondin...
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Use an acoustically transparent fabric to cover the rear of the driver (as used on old Klangfilms etc.).Fill rear chamber volume with chopped up pieces of foam (see above post) or whatever you want as long as its in small pieces. You could even use c...
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Based on your claim that spray can foam takes time (days) to stabilize, it seems limiting the quantity used would be the right approach.To do that you need to fill the majority of space with something solid.The following might work for you:Get some 1...
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Articulated roller handles (frames) do exist, but they are made to be adjusted and locked before use:http://www.thebossmaker.com/benefits.htmInstead I would consider using a thick, angled brush, not a paint brush, clamped to a long pole, used not in ...
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Go buy a load of tennis or racket balls and use them to float the horns. You can vary the number until you get just the right squish. As it is just the edge of the mouth that rests on the attic floor, this will require a some prep work... Here's how ...
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It is possible to do the job with only two humans, but in this case one of them might to be doing a lot of climbing up and down out of the attic.For the final few inches, you might need to extend the forks of the lift; you can do this by using a pair...
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Here's how I would do it: The day before: Reserve two lifts and get two pieces of old carpet (about one square yard each) and two bottles of champagne. Insist that everyone involved gets a good night of sleep before attempting to install the horns (t...
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What I like: The fact that they are doing this. The upper part of these speakers is truly beautiful, both in composition and in workmanship, which is on the level of fine jewelry. Sonic attributes aside, visually that Pinocchio tweeter horn i...
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Romy wrote:"...Let pretend that you play a normal some kind of horn with a lot of air in it. The air drives the driver impedance down..."I'd like to understand this; correct me if I'm wrong:As soon as the membrane of a horn-loaded driver starts t...
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Paul S wrote:"...I am not sure what you mean by "rigid" foam..."By rigid I mean brittle; foam that does not bend, but breaks with a loud snapping "pop". Rigid foam urethane does not rebound at all after compression... In fact there is no compression ...
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I didn't know rigid (hard) foam was available in a spray can. Be careful; if you're using proper rigid foam, it expands with great force and would likely push through any tape protecting the cone of the driver.However, the only really rigid foam I kn...
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Here's how I'd make a hard rear cover/rear chamber.I describe the process in detail, as it is a good investment of my time; I expect to have a similar condition and requirement for my own mid-bass horns (intended for use with AK-151s).This approach c...
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First question:
With the 1.5 gallon rear chamber, the resonance is 700Hz With the basket sealed by tape (very small rear chamber), the resonance is 49Hz Assuming there was not a typographical error, from this we can conclude: 1) Larger...
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When doing the final assembly, you might want to use Nylock type self-locking nuts:http://www.nylocknut.com/Looking at the images, this might require that you use slightly longer bolts (the few threads exposed beyond the existing nuts are those that ...
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Zako wrote:"...Red lights would make it look like the red light whore house district in Amsterdam..."Zako, take a look at the following definition for "Cathouse" (Cat-House):http://www.google.fr/search?hl=en&safe=off&q=define%3A+cathouse&...
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The presence of this "bug" is clear. Apparently your Raal tweeter is somehow making your system more vulnerable to the issue than mine. I'll refrain from guessing exactly why, as I'm not familiar enough with the dispersion pattern of this tweeter...
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Despite all practical advantages to be had in covering the mouths, I don't believe there's any significant technical advantage. What is likely to weigh more heavily is that there's something very irresistible about looking at an object that speaks so...
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Comb filtering in the HF/MF overlap?jd*...
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To save people from researching the differences between Romy's and my systems, I'll note the principal differences here, ignoring our ongoing mid-bass projects, which will be different, but both are incomplete, so not yet in the picture.As concerns t...
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Try thinking about it like this: Moving your ears 1/2" closer to all drivers in the system is not the same as moving a single driver 1/2" closer to your ears.jd*...
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Romy wrote:"...The Foam Factory do not offer as good prices as I initial thought and the quote price for individual 72” sheet. Thiers prices are similar to anybody else..."That's surprising... Maybe they've become expensive. Circa 2002 they were by f...
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Romy wrote:"...Yep, this Foam Factory look good and the prices are very good, thanks. They do not have the right light colors that I would like to have..."No problem; this foam can very easily be painted using a device like a Wagner Power Painter (yo...
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You might try the Foam Factory; they are easy to deal with, inexpensive, have online ordering, quick turn around and can ship anywhere.They are NOT a typical audiophile-oriented acoustic room treatment supplier. Nevertheless, they are equipped to cut...
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Romy wrote: "...Then, juts for experiment I did what I hated to do – I covered the large 25” by 7” feet glass window behind the Macondo with soft, 4 layered, 1” think, fabric blinds (very cool blinds for acoustic purpose – and the come with the ho...
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Another approach: Paint the horns to match the white of the existing walls/ceiling, then install light sources that shine from the mouth back into in the throats of the horns, using the horn as a sort of parabola to reflect light into the room. Two l...
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If correctly applied using traditional "wallpaper paste" adhesive, unless exposed to humidity, it will not peel, and is in fact notoriously difficult to remove (requires aggressive steaming). I have to say though that having a sort of aversion to non...
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jd wrote:"...There is a Spanish company that offers a solution in the form of a semi-cured, gooey, squishy, rubbery sheet with an adhesive backing on one side... It is about 1/4" thick, and is sold in rolls... It is very heavy; a pair of 2m x 1m roll...
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About horn body resonance: I used to doubt the need for mass in horns; after all, how much energy can a flimsy paper cone generate? Still, I went ahead and followed the advice of others when building mine, making them very strong and heavy. With ...
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Romy wrote:"...Jessie, do you use Vitavox bass drivers..." Yes; AK 151s (7.5 Ohm voice coils)."...if you do, then did you measure the Vitavox resonance in open air and in your bass horns?..."I have not yet measured either case. As previously mentione...
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