特殊设计的220MS
Superior Magnetic Structure
conventional speakers have ceramic type magnets. Fine for them. But conventional speakers do not have magnetic suspension, thus a more sophisticated magnetic structure is needed. The 220MS has a huge 6.1 lbs Alcomax magnet to provide and enormous magnetic force directed into the gap.
The Unique Magnetic Suspension System
The problem of getting a moving coil back to its starting position, after an electrical signal has driven it out, has challenged the minds of designers for many years. Many types of acoustic and mechanical suspension systems have been developed. But they all had to be designed for mass production, and no device developed to date can match the performance of the truly unique Hartley patented magnetic suspension technology. At 10Hz per second, conventional voice coils return to their neutral position in about 1/350 of a second. The Hartely 220MS speaker with magnetic suspension can return in 1/1600 of a second. This translates to unequaled transient response and an overall clearer reproduction quality.
The Voice Coil
Again, innovative engineering and hand building make a big difference. The 220MS voice coil is actually two voice coils. They are physically isolated by a specially prepared compliance only 4 mils thick. The outer coil is made of copper and the inner of aluminum and the physical separation allows the inner aluminum coil to move independently at higher frequencies. Because the total coil is only one inch in diameter, the 220MS cones can be of maximum mass. The Hartley voice coil was patented in 1964 and because of its unique dual design it’s the only voice coil that directs high and low frequency sounds to separate cone sections of the speaker.
Polymer Cone
Conventional speakers use steel for their speaker frames. It’s strong and easy to make. It does have some unfortunate resonance qualities. But it’s good enough for most mass produced speakers. Since Hartley made only 3 speakers a day, they did not need to compromise. The frame utilizes a hand polished aluminum frame that provides perfect stability and resonance quality.
And Much More!
Type Full-range
Frequency Range 20Hz-22kHz
Impedance 5-8 Ohms
Magnetic Weight 6.1 Lbs
Dimensions 10 3/4" total diameter x 5 9/16" D
Weight 7 lbs each unpacked
http://www.hartleyloudspeakers.com/new_page_8.htm
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