I tested the OBL-11 Troels Gravesen project before I opt for TQWT mkII (which has some similarities to Ariel: scandinavian low colouration drivers; waveguide vs more common sealed or vented), also Troels project. Even in my small room, which was responsible for the defeat of OBL-11 (too much midrange reflections), the unit 15 "shook things in my room less than 5W, with a very usable response to 40Hz. WOW...!!
I used an 18Sound 15" speaker but I don't remeber the model; is one more compatible with original proposed by Troels.
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There's an excellent reason I clean my contacts with some frequency, and I connect / disconnect from time to time, to restore the perfect contact.
If this amp is operating in open loop, will operate like an current source. I believe it has some feedback, because Williamson-style amp users generally use some feedback (but not always). I don't believe in the need to have DF>10 for damping 99% of speakers, and some will benefit to have LOW DF (if cross/enclosure is taken into account).
re: Lynn's positive comments about M1 hologram OB: M3 is suposedly an identical but a cost-efficient (industrialized?) version at half the price, which now borders on disturbing when compared to some ongoing DIY efforts (incl. mine 
). however I would love to see some measurements both on- and off -axis. crossing to a CD as low as 800Hz beats even Geddes at stretching a CD low in a home application (basically claiming that published specs only apply to higher volumes in PA applications). I still wonder about how well the 100-800Hz range is served in M1/M3?
hopefully we get some here on the forum to look more into coaxials on an OB.
). however I would love to see some measurements both on- and off -axis. crossing to a CD as low as 800Hz beats even Geddes at stretching a CD low in a home application (basically claiming that published specs only apply to higher volumes in PA applications). I still wonder about how well the 100-800Hz range is served in M1/M3?hopefully we get some here on the forum to look more into coaxials on an OB.
If efficiency, passband frequency reponse, coil impedance, linear Xmax and some other parameters are very close, is possible to use them, thanks to OB use. Most units differs more and will need an cross redesign, so I fully agree
.Before that, in 2012, I adventured with an 10" Audio Nirvana in OB, but I used an enormous beast/monster (with NEGATIVE WAF
), far far bigger than OBL-11. With that huge OB, the response becomes acceptable in my room. Lucky for me, because I did not know anything when I built such OB ...As I said, my small room is messing with dipole action from "little" OBL-11
I went down a similar road - but then took it to the logical conclusion. Eliminate every connection which is a weakness, and the result, subjectively, can be dramatic.
An analogy is a space capsule, with crew members inside - and you have to stop air leaks. If you're feeling good about getting all the obvious leaks fixed, but perhaps not all that exist, there is an unfortunate consequence - the crew members die. You know that you're getting somewhere when the door is opened at the end of a journey, and you don't have corpses inside.
Yes, because of all these things I opted for the DIY route, since... ever.just use silver , is oxide conduct
DIYbras you need a good elettronic too not only speakers unlucky
Been enjoying a 12" coax plus 2x18's per side in various alignments. Active with 90's touring amps of course. Haven't become bored with it yet. Does many things right.
Martin Audio has some new coaxials that I want to get my hands on. They seem to be advancing on Tannoy's(now Behringer
) accomplishments.
See and Hear Gary Dahl's System !
Anyone interested in seeing and HEARING Gary Dahl's Speakers (Actually, a major portion of his whole system) will have the chance at this Summer's DIY Meet put on by the "Sound DIY Club" and is being hosted by the Pacific NorthWest Audio Society at the end of August!
More details under the Events heading.
Best Regards,
TerryO
Anyone interested in seeing and HEARING Gary Dahl's Speakers (Actually, a major portion of his whole system) will have the chance at this Summer's DIY Meet put on by the "Sound DIY Club" and is being hosted by the Pacific NorthWest Audio Society at the end of August!
More details under the Events heading.
Best Regards,
TerryO
They mention Beryllium in the compression driver , and one of the drivers in a photo is a Radian- has their label on the back. So at least on their high end Lumina stuff it's pretty clear.
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Spatial Hologram M1 Turbo Version 2 Speaker Review - Home Theater Forum and Systems - HomeTheaterShack.com
Back shots of the M1 that Lynn is talking about.
Back shots of the M1 that Lynn is talking about.
Been enjoying a 12" coax plus 2x18's per side in various alignments. Active with 90's touring amps of course. Haven't become bored with it yet. Does many things right.
Martin Audio has some new coaxials that I want to get my hands on. They seem to be advancing on Tannoy's(now Behringer
What advancements has the Martin over a Tannoy?