Top caps are then mounted on each speaker column. Four legs extend out from the base, each tipped with a sharp spike. The tall, thin towers must be anchored to their flat brass bases with ¼" hex-head screws. Some assembly is required before the Radias can be used. The crossover uses modified fourth-order Linkwitz-Riley filters, with an in-phase driver connection. 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. 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. 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. Loudspeaker cabinet design has been strongly influenced by home theater. That's why we are now using only those dome-tweeters and horn drivers that fully meet our requirements.Bohlender-Graebener Radia 520i loudspeaker Quite frankly, this tolerance problem is prominent with many magnetostats, ribbons and AMT drivers - none of the requested manufacturers wanted to guarantee a rather narrow tolerance limit of < +/- 1.5 dB. If you order from PE (Parts-Express USA), you get "standard" - from 10 pieces you probably can find 2 to 4 suitable. This method will no longer work, as the new owner is not interested in small OEM customers, and even less in the micro DIY business! This is too delicate without BG, as there defective drivers were replaced. +/- 1.2 dB on our own test site, as a tolerance of +/- 3 dB up to DOA (Dead on arrival) is delivered ex works!įrom 100 pieces the outcome often was only 30 pieces of really good drivers. Since BG also could not work with the high tolerances for its own production, especially Neo3 models, BG selected to +/- 1.5 dB in advance. Due to a completely changed situation, we will not order BG drivers any more, since these all have to be selected extensively.īG-Radia was sold end of 2014 and we would now have to buy very large quantities directly from the manufacturer in the Philippines.īefore that, we have received specially selected drivers, which were tested again before shipment by BG in USA.
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