G2 alu Ribbons experience

[dokter dB]

Im busy contructing a speaker (who of you isn't! )
It is 4 way active with 2x Peerless HDS 182 lows, 1x Audax HM100Z0 mid (500Hz-2k5) with waveguide, and initially for the highs I wanted a triple tweeter array (already bought it) vifa DN26 neodym 1" with triple CD-waveguides (already made them, looks and measures really nice...) this should be like MMT config. So the 2 first tweeters do 2k5-6k, and the upper one 6k-30k....
Center-distance between the tweeters is 42 mm....
There is also an additional sub (12" with pass membrane, 50L) with all the electronics inside....

Unfortunately I don't know how to place the pics on the net (have space though) but I'll find out and it comes later...

But I see a lot of aluminium ribbons around, and now for the high's, I changed plans..... so does anyone have experiences with these G2 ribbons:
http://www.e-speakers.com/products/ac-ribbons.html

I'm Interested specially how they are soundwise and compared to average dometweeters....

Or does anyone have other alu-ribbon options/experiences?
for instance:
http://www.swanspeaker.com/drivers/index.htm#p

Or circular rdt 25:
http://www.e-speakers.com/products/atd-tweeters.html
Would be nice if the magnet was smaller, to fit in my 1", 42 mm centerdistance triple waveguide


If I'm gonna use the ribbon, I will also make a CD waveguide for it.....

thanx so far guys

[dokter dB]

[Leeuwarden]

You might also want to check out www.clofis.nl.
If you end up interested in HiVi ribbons check out www.partsexpress.com. (also for B&G) (They sell the RT-2 for about $ 100,- which costs 360 Euro at www.expolinear.de. Even with taxes and customs the difference in price is )

Jan

[dokter dB]

[dokter dB]

(see pict) this is to get an idea about what I meant with the 1" drivers
thanx leeuwarden for the reply..... I did found them at clofis already, but placed a more international link
I've seen the same drivers under a lot different brandnames
And i'm indeed really interested in the other ribbons at parts express......
Aren't they all a bit the same? the more expensive the higher the sensitivity?
I don't want to use a ribbon thats too big (height) ... vertical dispersion might get too small ......

[LineSource]

dokter,

Your cabinet design would easily allow bottom mounted ports. Bottom mounted ports can give better isolation of rear cone midrange radiation from having a direct ear path, and also can give higher and more uniform floor gain. A bottom floor board would better guarantee uniform dispersion on hard floors or carpeting. You can also decide to vent either just to the front, or to three sides to better disperse the long wavelengths.

B&W uses bottom ports on their Nautilus, and their website has technical discussion of the reasoning.

[dokter dB]

thanx linesource, good idea!,
cabinet will be quite full of damping, and a little bit high tuned (54Hz), because I like that more.... gives more efficiency at 60-80 Hz...., and a bit better transient resp.....
And of course I'll be using seperate pass. rad. sub for 50Hz and down...
I'll use the 54Hz 4th order acoustic high pass filtering of the speaker itself, so the sub is getting linkwitz 54Hz low pass... the speaker itself gets no electronic high pass.....

But I dont think there will be so much backradiation out of the port? I've a round back, and loads of damping on the back......
port res. is at about 900Hz....
well maybe I'll change it....

[dokter dB]

no one?

[tiroth]

People do play games with the term "ribbon"...the HiVi tweeters that I have seen are planar transducers, not ribbons, so at least look at this carefully before buying. PE also sells a cheap ribbon that would probably not qualify as a "true" ribbon since it uses multiple tracks on a plastic element.

[dokter dB]

ok thanx!
but the "ribbons" or whatever I like to go and use are probably the aluminium things, same as the older and known eton ER4...
Very light membrane, and from what I see indeed probably officially no ribbon, the thin alu (harmonica folded) band is used as the voice coil itself..... but lets call it a small line source
Efficiency is quite high (96 dB, at least they say so...)
Im curious for experiences from others with this type of tweeters, soundwise etc., they look extremely vulnerable?