The ribbon itself consists of a diaphragm of polymer film strung with aluminum conductors, which carry the audio signal, suspended between push-pull magnet arrays. The 520i's ribbon covers the spectrum above 350Hz and fires through a 30mm-wide slot in an aluminum frame.
BOHLENDER GRAEBENER BG RADIA R18I DRIVER
Levitsky mounted the 520i's ribbon driver in a tall, open aluminum frame to minimize cabinet resonance effects.
A line-source speaker radiates a cylindrical wavefront, which suffers milder propagation losses than does a conventional cone driver. This narrow driver offers wider horizontal dispersion than a panel speaker, while suppressing strong early reflections from the floor and ceiling by acting as a line source. (aka BG Corp.), has taken advantage of the slim tower motif in the design of the Radia 520i speaker, which has a 50" midrange-tweeter ribbon driver. Igor Levitsky, speaker designer for Bohlender-Graebener Corp. While these slim speakers fit more easily into home décor and living spaces, to fill out their bass response they depend on being used with the subwoofers that are standard in multichannel systems. Large floorstanding cabinets, required for reproduction of bass frequencies, are being replaced by tall, graceful towers with small footprints. I hope this helps and if you have other questions or want to give what aplication he recommended BG (and what models) for I could help you more.Loudspeaker cabinet design has been strongly influenced by home theater. Like Phase Tech dARTS or some of the Meridian product. For a theater that expensive, I would look at other options. I have not used their box product at all nor have I done the $15K a pair in-wall stuff. They are pleasant to look at while not standing out. The PSB's and Sonance looked very good, but again, the BG's blended in with the ceiling really well. The Bostons looked good (but are GIGANTIC in cut out size). A lot of inceilings tend to be too white, or too almond. The BG's blended into the ceilings really well too. Some of the other brands were OK, but for an upper-tier speaker for distributed audio I think you would be hard pressed to find better in a 6 1/2" or even 8" (depending on ceiling hieght) speaker. The Bg PD-6C litterally sound like someone put a very high quality bookshelf speaker in the ceiling. The source was just a plain entry level Pioneer two channel receiver and Pioneer CD player. We listened to Clapton, Cold Play, Garth Brooks (live album), Sheryl Crow, a classical mix, a techno mix, and just for kicks even some rap. You have to listen to the clarity of these to belive it. With the other brands I only had the 6 1/2" models and the BG killed those too. The Bass out of the BG 6" trumped that of the 8" PSB, Parasound, Boston, and Sonance by a country mile. Brands: TruAudio, Parasound, PSB, BG, Sonance, Boston, Dayton Loud Speakers, Phase-Tech, Proficient, NuVo, RBH. We used a wide range of brands and price points varried accross the board from $150 per pair to $1500 per pair MSRP and the BG's performed the best and it wasn't even close. We tried these speakers in a vaulted ceiling, in a tight attic space, and in an open attic space. And I say that regardless of price point and without location issues. I can tell you that as far as architectural products go, the BG PD-6C ($600 per pair) is, without doubt, the best in-ceiling speaker for distributed audio I have ever listened to as is their in-wall counter part. I did this not because I'm unhappy with BG or any other brand but because we're dedicated towards continuous improvement and I like to bring in different brands to compare. I recently loaded up the truck and did an in-ceiling shoot out with several different brands is some new construction homes (as well as my own home) that were near being completed. I'm a BG dealer in SW Ohio and can vouch for several products in the BG line.
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