Bolzano Villetri speakers, how do they work

amsci99 · 3rd May 2006, 07:38 AM

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?

Scottmoose · 3rd May 2006, 08:25 AM

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

felixx · 3rd May 2006, 11:07 AM

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.

anastas14 · 17th November 2006, 10:11 AM

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.

el`Ol · 17th November 2006, 03:55 PM

My experience is that a rising frequency response can compensate the lack of dispersion.

rob3262 · 17th November 2006, 06:51 PM

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

anastas14 · 20th November 2006, 07:54 AM

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.

3rd May 2006, 07:38 AM	#1
amsci99 diyAudio Member Join Date: Jan 2006 Location: Western region	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?

3rd May 2006, 11:07 AM	#3
felixx diyAudio Member Join Date: Feb 2005 Location: in center	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. __________________ "I'm glad I can build my own mistakes." https://picasaweb.google.com/115586837612433686520

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3rd May 2006, 08:25 AM	#2
Scottmoose diyAudio Member Join Date: Mar 2005 Location: UK	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

17th November 2006, 10:11 AM	#4
anastas14 diyAudio Member Join Date: Nov 2006	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.

17th November 2006, 03:55 PM	#5
el`Ol diyAudio Member Join Date: May 2005 Location: Bavarian Forest	My experience is that a rising frequency response can compensate the lack of dispersion.

20th November 2006, 07:54 AM	#7
anastas14 diyAudio Member Join Date: Nov 2006	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.