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#1 Interesting ribbon
Posted: Sun Dec 17, 2017 4:47 pm
by IslandPink
High efficiency, low distortion to 1kHz, new twist on technology. Not sure what they cost, though.
http://www.troelsgravesen.dk/Viawave-GRT-145-4.htm
#2 Re: Interesting ribbon
Posted: Sun Dec 17, 2017 5:47 pm
by andrew Ivimey
Very interesting and it throws up the question I have never settled in my own understanding...what's the difference between ribbons and Dr Heil's AMTs!?
#3 Re: Interesting ribbon
Posted: Sun Dec 17, 2017 5:55 pm
by ed
my first thought was check it out against the tpl-150....as it's a solution looking at the same problem area...
and in every respect it falls woefully short on paper....the price might redeem it though.
#4 Re: Interesting ribbon
Posted: Sun Dec 17, 2017 6:17 pm
by IslandPink
I don't think they're really aiming at quite the same bands are they ? I know the AMT's are bigger units, more efficient and aimed to get a fair bit lower than most ribbons. This new one looks to be a replacement for small ribbons for 2 or 3-ways but crossable at 2 to 2.5kHz. My understanding also is that a TPL-150 will need a tweeter and won't sound as good as ribbon above 5kHz. In fact a couple of people I know don't like the TPL-150 sound at all. I like what I've heard from Steve's, but always with an alnico bullet tweet added for the top end.
Andrew, the AMT is like a pleated (concertina) aluminium membrane thing that squirts air out ( or sucks it in ) quicker than the pleats themselves compress/expand. Normal ribbon can be smooth or corrugated but doesn't have the deep pleats and just sends waves out in a more conventional way when energised by current apllied from top to bottom, and the Neo magnets it's sitting between. I haven't looked at exactly how the energy gets from the terminals to the membrane on an AMT tweeter.
#5 Re: Interesting ribbon
Posted: Sun Dec 31, 2017 10:45 am
by ed
this Klang & Ton review puts them at 500 euros for the pair. Who's going to test the ice?
http://www.jantzen-audio.com/wp-content ... ngTonn.pdf
#6 Re: Interesting ribbon
Posted: Mon Jan 29, 2018 5:18 pm
by rowuk
I think that the AMTs sound pretty "grey" in tone. Kind of like BMS ceramic magnet drivers for horns. I used to have stacked Quads with the Kelly/Decca ribbon tweeter. Never had any issues above 10K!
#7 Re: Interesting ribbon
Posted: Mon Jan 29, 2018 5:30 pm
by andrew Ivimey
Hmmmm never heard 'Grey' AMTs ... Don't know what the modern ones sound like though.
#8 Re: Interesting ribbon
Posted: Wed Mar 21, 2018 9:35 pm
by IslandPink
Troels seems unusually excited about the results :
http://www.troelsgravesen.dk/ATiRi.htm