Page 114 of Madisound Catalog 2008 by Speaker Components, Inc.

raal is a company based in zajecar zayechar eastern serbia it is 100 owned and managed by its founder and director solely creating the company s policy products development and strategy in an effort to recreate a sound that happened in some other place in some other time audio engineers are constantly trying to find the best means to record and reproduce the sound as exactly as possible if we could have absolutely accurate replica of recorded sound at the end of an audio equipment chain than the sensation that we would have would be the same as we actually participated in the recorded event of course absolute accuracy is not possible fortunately enough it has been proven that it takes a certain level of reproduction accuracy to make the human or animal ears experience no difference to original impressive achievement but with ridiculously expensive and impractical laboratory equipment and conditions our goal is to bring the most of that experience to everyday life raal 70-10d ribbon ribbon material aluminium ribbon dims 70 x 9.5 x 0.004 mm ribbon mass 0.0075 g ribbon area 6.65 cm sq gap induction 0.62 t frequency response 2 khz 100 khz sensitivity 92 db 1 m 2.83 v impedance 8 ohm program power handling 150 w recommended crossover 4th order l-r 2800 hz price each $324 price each with amorphous core $424 raal 140-15d ribbon ribbon material aluminium ribbon dims 140 x15 x 0.004 mm ribbon mass 0.022 g ribbon area 21 cm sq gap induction 0.51 t frequency response 500hz 100 khz sensitivity 95 db 1 m 2.83 v impedance 8 ohm program power handling 200 w recommended crossover 4th order l-r 1600 hz price each $538 price each with amorphous core $638 recently we finished development of amorphous c-cores transformer application in our ribbons we are the first to use amcc s in ribbons for absolutely uncompressed high power transient transfer and at the same time even further improving already the best low-level performance in the world today by decreasing the width of hysteresis compared to hf ferrite cores for direct coupled tube se-ribbon we succesfuly developed 175:1 ratio -3db at 120khz amorphous c-core transformers that can carry dc idle current of set impedance conversion is about 30000:1 bringing the 0.1 ohm ribbon up to 3kohm good for plate loading of most triodes in hf features · · · · · · · · · · special flatfoil® pure aluminium ribbon special symmlead® low inductance signal path special equafield® ndfeb magnetic structure special non-wave-guide inox front plate exceptional vertical dispersion super-fast settling time flat frequency response low nonlinear distortion high signal power handling highest reliability equafield® technology the magnetic field in raal ribbons is homogenous in other words the width of the gap is designed to have the same strength at the ribbon edges as at the middle equafield® technology dramatically reduces stress and distortion of the ribbon foil we ve extensively used the fem and bem magnetic circuit analysis software to create a precisely-shaped magnetic field that is consistent across the gap width and depth in order to create such a field with real magnets very strong ndfeb magnets have been precisely machined into a very special shape prior to magnetization the process of making the magnetic field homogenous does sacrifice some of the magnet s strength however this loss of efficiency is eclipsed by the benefits of low stress and low linear and nonlinear distortion available for oem customers 70-20xr ribbon tweeter

[close]