| FULL RANGE
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| Lowther, AER, Coral, Reps | |
| High efficiency wideband transducers have been around for quite a long
time. The technology of coupling an ultralight diaphragm to an ultra powerful motor dates back more than 60 years when Donald Chave and
Paul Voight created what was to become the famous Lowther driver. |
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| LOWTHER
Lowther DIY sites: http://www.mindspring.com/~darmah/lowther/lowther.htm |
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| Implementations: Rethm,
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| AER |  |
| REPS R-1
http://www.rlacoustique.com/reps1.htm Francis Reps took over these basic principles in his own drivers. The R-1 is powered by an 8 pound Alcomax-5 Magnet (aluminum, nickel, cobalt) producing a magnetic field of 20 000 Gauss The bobbin is made with a very rigid paper cylinder over which lightweight aluminum wire is wound in such a manner as the thickness never goes over 0,075 mm. This assembly is very light. The bobbin is inserted in a 1 mm gap in the magnet.. The basket is made using high quality Alcoa 356 aluminum. |
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| The diaphragm and the whizzer cone are made with very stiff , lightweight German
paper. And small ribs are added for extra rigidity. Suspension is foam material. A brass centerpiece (diffuser) is screwed in the magnet centerpiece. Total cone excursion of the R-1 is ± 1 mm. Efficiency of the R-1 is 99,8 dB/W/m and distortion at 100 dB is under 0,15 %. See a finished system using REPS under EXTREME SPEAKERS
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