Post by Owen Y on Apr 20, 2017 9:50:10 GMT 12
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Post by foveaux on Apr 20, 2017 11:36:55 GMT 12
Me too... I 'moved on' my Shahinian Obelisks some time ago: and still miss them. Whilst very room dependent, they had/have an engaging, satisfying sound. I hit a particularly sweet spot when, despite the conventional wisdom that suggested they needed powerful SS amplification, I powered them with very capable Ecofan and Mapletree valve amp systems, on separate occasions. I also came across this website some time ago on omnis: www.omniaudio.com.au/index.html - looks a very interesting design and could be more cost effective than other manufacturers? (in a dustbin kinda way!), but Id still like to hear them. Good info. on omni principles on the site too. 
"I see music as a lifetime affair." [Rory Gallagher]
"Free - I miss that band, but when I look back, we were very young" [Paul Rodgers]
850 posts
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Post by colinf on May 30, 2017 15:25:47 GMT 12
I was lucky enough to hear the German Physiks Borderland IV at the Melbourne Hifi show last year, being used with Ypsilon amplifiers and Mark Dohmann's turntable. Also a Studer A820 reel to reel machine. When I walked into the room Led Zeppelin was playing from the Studer. I was awed and almost overwhelmed at the spectacular ballistic dynamic range!!! And the feeling that you were right in the studio with them playing right in front of you. The speakers had such a lifelike openness that I've been dreaming about how to afford a pair ever since. They're distributed in Australia by Telos. The least costly G-Ps start at about $15k. The Borderland IV I heard was about $40k. There's no way a conventional speaker can sound like that!
AMR-iFi R&D
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Post by michaelw on Jun 6, 2017 19:13:48 GMT 12
back in the '70s jon dahlquist published an article in the absolute sound on loudspeaker design.
he wrote that while an omni did not meet the requirements for facsimile reproduction and spatial accuracy, which would require a speaker that radiated from all directions rather than in all directions, omnis did have several advantages;
- total sound pressure level is much more even over a wider listening space,
- omnis tend to sound smoother compared to semi-directional speakers, where both have flat on-axis response,
- the wider listening spaces leads to a larger perceived stereo sweet spot.
disadvantages;
- in order to maintain a semblance of correct stereo imaging, omnis rely heavily on the precedence effect of the small amount of direct sound reaching the listener before the reflected sound, tricky as up to 95% of the sound from an omni is reflected, consequently the omni is generally the poorest imaging of any loudspeaker type,
- omni performance is highly dependent on room acoustics and room volume, ideally a smallish, highly damped room with treatment to reduce reflectivity of the room,
- the omni will also excite room resonances more at a given location in a room than other types of speaker.
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Post by Owen Y on Jun 6, 2017 20:00:23 GMT 12
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Post by colinf on Jun 6, 2017 20:39:36 GMT 12
Drool...I've wanted a pair of those as well. Driven by those brilliant 1000 watt MBL amps. I heard them in the US a while ago. The combo of absolute power and a really good omni speaker is pretty awe inspiring. Imaging...not heard anything like it out of normal speakers!
AMR-iFi R&D
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