![]() ![]() Moving them out of the way to try another set of speakers was out of the question. Once positioned in the room, these speakers were so heavy they never moved for almost three years while serving as my reference speaker system. It not only filled the room with great sound, it physically filled the room with a solid wall of plywood when the wings were rotated out to be flush with the front baffle. The Lowther sound was coupled with solid and deep bass produced by four Eminence Alpha 15A woofers. These large Lowther two way OB speakers lived in my listening room for several years and were praised by everyone who visited to hear the system. My goal was to have the speaker blend into the room and not be so noticeable, it didn't work. Since this was more or less an experiment, I painted the baffles white to match the wall color. The retractable wings allowed me to get behind the speakers to access the wiring and power cords for the active crossover and a pair of power amps. Even with the wings folded back the dipole speakers were still quite large. I built a 60 inch wide open baffle with wings that could be folded back to reduce the front baffle width to a more manageable 24 inches. Shown below is my first Lowther based OB speaker system built in 2005. A few years ago I decided to try this approach and have since built several dipole speaker systems based on this concept. ![]() This is an appealing idea since the large excursions required to produce significant bass output are removed from the full range driver. If a passive correction circuit (really a modified BSC circuit with additional midrange attenuation) is acceptable to the designer then a resonant style of enclosure, a bass reflex enclosure or some form of quarter wave enclosure, can be used to produce a balanced SPL response at the expense of some loss of efficiency.Īn alternate full range driver design approach introduces a second driver into the system, a large diameter high efficiency woofer (usually a professional audio model) to produce the demanding bass frequencies allowing the full range driver to cover the remaining majority of the audio spectrum where its real strength lies. Getting a hybrid transmission line / back loaded horn enclosure to perform well is not a trivial task. If the designer is really serious about using only one driver, without any passive circuit elements between the driver and the amplifier, to cover the entire audio spectrum then in most cases a hybrid transmission line / back loaded horn enclosure is required. The biggest challenge faced by full range driver enclosure designers is producing enough bass output to match the rising midrange response typically generated by an efficient full range driver. Project 10 : Lowther Open Baffle / Acoustic Elegance H Frame System Lowther Open Baffle / Acoustic Elegance H Frame System ![]()
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