Bolzano Villetri speakers, how do they work - diyAudio
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Old 3rd May 2006, 08:38 AM   #1
amsci99 is offline amsci99  Singapore
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Default Bolzano Villetri speakers, how do they work

Anyone know how the new range of Bolzano Villetri speakers at
http://www.bolzanovilletri.com/ work? I know that they have a pair of upward firing woofers but how is the sound disperse? On the Duevel range, there is the 'dougnut shaped' horn to disperse the sound but I don't see anything here.

I am quite interested in omnidirectionals because of the contruction of my room which has various columns and protusions to distort sound, is there any literature on them?
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Old 3rd May 2006, 09:25 AM   #2
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It rather depends upon what you call an omni-directional speaker. Siegfried Linkwitz has some stuff on his site -he's got his Pluto project, and several general articles well worth a read. www.linkwitzlabs.com

Omni's don't have to have a big bullet-type dispersal arrangement -Shahinian manage without, just using multiple treble units etc. OK, it's arguable if they are 'true' omnis, but it's not worth splitting hairs over. Then, bipoles operate in an omni-directional manner at certain frequencies: http://www.t-linespeakers.org/projec...dresponse.html

And of course, you have types with forward, and upward firing drivers -Castle's Howard S3 or the old Linn Isobarik for example, which are semi-omni in style. I suspect those you link to, which appear to be two boxes, have one upward, and one downward firing driver onto the small bullet suspended in the centre, which I imagine contains some tweeters.

I like omnis -they can be very effective. There isn't a great deal of available literature or theory to them though that I know of. Some just construct a 'normal' floorstander, chop the top at an angle of 45 degrees, and mount the drivers on that. Basically does the same thing: increase the ratio of reflected to direct sound.

Hope some of this is of help
Scott
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Old 3rd May 2006, 12:07 PM   #3
felixx is offline felixx  Romania
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Let's see:
This enclosures folow the basic instructios:
-3 chambers
-first is a subwoofer -izobaric or not,depends on the case.
-the upper chamber is simply bass-reflex with driver oriented to tweeter.
-the midle chamber seems to be "type dispersal arrangement " but I don't think that is a proper arangement for the angle's.The Duevel example seems to me the BEST example of efficience on omni speakers.
Anyway,seems to be two tweeters mounted on reverse type.But I dont think that upper bass-reflex do the job very effective,comparing with classic aragement.This is only my opinion.
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Old 17th November 2006, 11:11 AM   #4
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after Clement's comparsion with MBL and Duevel (http://stereotimes.com/speak101306.shtml) i was put into curiosity, but didn't find any opportunity to check the BVs, they are still not so really available

but once i've met occasionly a guy who works with couneter-apertour loudspeakers for 7 years, he told me very interesting story and showed me the BV abilities. i've listened to those Bolzano Villetri floorstanders and it seems they really works. not semi- (like others) but _true_-omnidirectionals. Two drivers workin in phase but against each other make a virtual spherical radiator in between, thus it excludes _at_all_ doppler's modulation. coz not drivers but a sphere is the source of sound. it emmits all the way as i can understand, and that's why we got not only direct but also a properly balanced reflected sound waves. As soon as i was listening to this guy and to the BVs i became to feel embarrassed with my scepticism and had to admit that counter-apertour works. i've glanced at direction diagram and banand it was ideally round and the frequency range was full, not like other omnis with cut-off at the lowest.
that was rather interesting introduction and i'm going to check it more precisely and by my own experiments in the nearest future.
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Old 17th November 2006, 04:55 PM   #5
el`Ol is offline el`Ol  Germany
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My experience is that a rising frequency response can compensate the lack of dispersion.
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Old 17th November 2006, 07:51 PM   #6
rob3262 is offline rob3262  United States
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amsci99
I have a pair of Ohm I omnidirectionals; High tweeter, low tweeter, midbass mounted on top with a high tweeter and subwoofer front mounted.
The speakers provide a stereo image no matter where I am in the room. Personally, I prefer a higher degree of pinpoint imaging that can not be provided with this design. My 2
- Rob
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Old 20th November 2006, 08:54 AM   #7
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rob3262

as 4 me, such solutions with upward, side/all sides directed drivers are too complicated or impossible to achieve correct soundstage
also appeare areas of direction diagrams overlaping, in the corner directions

i didn't manage to override those effects.
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