ShinOBIWAN said:
I have foam that looks very similar, obtained from Earl Geddes. It's in my Unity horns and results in a depth of at least 30cm from the tweeter to the mouth. Attenuation of the higher frequencies (18-20kHZ), looks to be a 3-4dB. So I don't think attenuation is what's at play here. More likely, it acts as a prism to disperse the high frequencies, especially at the top and bottom edges of the ribbon, where defraction would be an issue.
Sheldon
ScottG said:
The Visaton Topas that I was talking about:
http://www.visaton.de/en/bauvorschlaege/2_wege/700/index.html
😉
ShinOBIWAN said:
Yup.. I remember the pic *SOMEWHERE* in this thread. 😀 You actually used wood veneer for that one if I recall correctly.
Sheldon said:
Yes, that's exactly what I was getting at. Aleksandar calls it an acoustic lens.
ScottG said:
I was hinting that it was a magnetosata vs. a dome tweeter in the KEF/Vistaton comparison. The mid/bass driver materials were also polar opposites - titianium vs. poly.
The differences between the two was stark. Not least the fact that I've never heard such great bass from a 4" driver before or since then.
ShinOBIWAN said:
..it looks like it behaves as both a "lossy" compression chamber for the lower freq. response and a vertical waveguide.
Chances are though that without the "pleats" of a normal true ribbon, most of the excursion (and lower freq. response) is at the center of the ribbon (more so than normal) - which in effect means the compression chamber isn't so "compressed" (..that and the fact that it is made from a lossy material).
Sixth time I've mentioned this now:
I've had a new cordless Microsoft keyboard for about a month now and I've got to say its absolute rank naffness.
I just read back a part of the thread and realised that there's a ton of missing letters. Its true that I don't know how to spell and form proper sentences because I spent most of school day behind the bike sheds smoking pot(true) but that proportion of mistakes is obscene and clearly keyboard related 🙄
I've had a new cordless Microsoft keyboard for about a month now and I've got to say its absolute rank naffness.
I just read back a part of the thread and realised that there's a ton of missing letters. Its true that I don't know how to spell and form proper sentences because I spent most of school day behind the bike sheds smoking pot(true) but that proportion of mistakes is obscene and clearly keyboard related 🙄
ScottG said:
Isn't a magnetostat another word for true ribbon ie. the Vistaton MHT 12 was a true ribbon?
ShinOBIWAN said:
Nope - its a planar.. and while it has a very low mass it also has high dampening via physical boundry connections at all edges of the diaphram. (..typically cleaner overall decay but later in time, more like a dome with lower mass and greatly restricted vertical dispersion.)
A true ribbon sounds different.
ShinOBIWAN said:
I have a logitec (works fine), but still have the problem and didn't smoke the ganja.
😱
..see, things could be worse. 😀
ScottG said:
That's good because I swear down that I didn't have this twitching of the eye 10 years ago. 😀
ShinOBIWAN said:
No.. Its a *VERY* common mistake.. and you can blame it on the marketing dept.s of all these Co.s.
The only true ribbon that has edge dampening at all sides (obviously not front and back) is a (oops) *WOVEN* pleated ribbon. (..the pleated nature here is due soley to the basket weave appearance, in this sense it isn't "pleated" like normal true ribbons.) Apogee Acoustics used these, and I believe the ProAc "Future" loudspeakers used some from Veravox (which was I believe still a "re-badging" oem chinese driver).
Because of the additional dampening they sound something in-between a planar and a normal true ribbon.
ScottG said:
Prof. Vatchev from Bulgaria is the maker of the ribbons with silicone dampening on edges. The same product was ( I believe it still is) sold in Germany as "Expolinear", in Italy and US ( at E-Speakers) as ATD "Le ribbon".
Frankly I didn't know it was also "Veravox".
omega87 said:
Ah.. thats it ATD. Mon Graci!
I think though that there was a connection between Vervox and ATD.. but again, my memory isn't exactly "bit perfect". 😀
ScottG said:
Buy them drinks? I'll have to try that one 🙂
Its usually a case of looking how late it, accessing the empty space next to me and then me buying myself enough drinks to take home anything. 😀
I'm a pretty selfish person, not with money or the likes but you could say a bit unrelenting in how I work, my schedules and just general give and take. I think if I ever hope to have a long term relationship I'll have to ditch my somewhat adolescent attitudes. I'm 27 and I'd say the average women I 'meet' would be very early 20's which says a lot regarding the meeting of suitable minds. Women tend to outgrow me in other words 😀
Bit like Doctor Phil this or the Jeremy Kyle show.
omega87 said:
I didn't miss it 😉
I was just looking for points to disagree with you on in order to make it look like I know something about this hobby.
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