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Bohlender & Graebner Radia Planar Hybrid ribbon speakers
Used as a reference monitors.
These are narrow “quasi-ribbon fullrange” magnetic planar drivers from 350Hz on up, a pair of 6″ woofers below that for down to 80Hz.
Can be collected from WS10 8HQ
Can deliver 50miles radius free, then 50p per mile
https://www.stereophile.com/floorloudspeakers/1204bg/index.html
http://www.integracoustics.com/MUG/MUG/reviews/stereophile_radia-520i.htm
“Loudspeaker cabinet design has been strongly influenced by home theater. Large floorstanding cabinets, required for reproduction of bass frequencies, are being replaced by tall, graceful towers with small footprints. While these slim speakers fit more easily into home dcor and living spaces, to fill out their bass response they depend on being used with the subwoofers that are standard in multichannel systems.
Igor Levitsky, speaker designer for Bohlender-Graebener Corp. (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. 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. A line-source speaker radiates a cylindrical wavefront, which suffers milder propagation losses than does a conventional cone driver. Levitsky mounted the 520i’s ribbon driver in a tall, open aluminum frame to minimize cabinet resonance effects.
The 520i’s ribbon covers the spectrum above 350Hz and fires through a 30mm-wide slot in an aluminum frame. 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. Levitsky complements the ribbon with two 6.5″-cone woofers mounted in the 520i’s 7.75″ by 13.75″ lower enclosure, made from MDF. These provide bass down to 70Hz. The crossover uses modified fourth-order Linkwitz-Riley filters, with an in-phase driver connection.”
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Category: Sound and Vision:Home Audio and HiFi Separates:Speakers and Subwoofers
Location: Wednesburry