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The Realistic "Mach One" speaker was produced from 1976 to 1984,
an impressive 8 year run. An interesting feature, of this 160
watt speaker, is that it incorporates a horn tweeter and midrange
speaker, both of which are filled with ferro-fluid, to dissipate heat,
and both have adjustment controls as part of the crossover
circuit. The 15 inch woofer is made of a very dense paper and the
surround is made of a thick high quality foam which does not deteriorate
over the years. The price of the Mach One steadily rose from
$199.50 each in 1976 to $239.95 each in 1984. It was Radio Shack's
flagship speaker until it was surpassed by the Optimus T-300 in 1984
which was offered at $259.95 each. Both speakers were discontinued
in 1985 and replaced by Radio Shack's new flagship speaker, the
Realistic "Mach Two" which was offered at $219.95 each.
Today the Mach One is considered to be classic and one of
the best speakers ever offered by Radio Shack. It's considered
superior in sound and construction to that of the later Mach Two
speaker. Good examples of the Mach One show up on ebay from time
to time.
My two speakers were purchased from the west side Indy
Goodwill Outlet Center, in the fall of 2008, and are currently hooked up
to my Kenwood KR-9000G monster stereo receiver.
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