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By the 1960s Sansui had developed a reputation for making serious [clarification needed] audio components. They were sold in foreign markets through that and the next decade. Sansui's amplifiers and tuners from the 1960s and 1970s remain in demand by audio enthusiasts. [3] Since 1965 the matte-black-faced AU-series amplifiers were released.
Like other mass-produced record changers, some tonearms had heavier vertical tracking force (VTF), and poorer speed accuracy and rumble specifications than higher grade record changers. V-M mass-produced record changers, like their competitors' offerings, were used in low to medium priced audio equipment - compact systems, console stereos, and ...
In a direct-drive turntable the motor is located directly under the center of the platter and is connected to the platter directly. It is a significant advancement over older belt-drive turntables for turntablism, since they have a slower start-up time and torque, and are prone to wear-and-tear and breakage, [5] as the belt would break from backspinning or scratching. [6]
In the CD era (post 1983), the top line Nakamichi products were termed the "Dragon." The Dragon-CT turntable ("Computing Turntable") automatically adjusted for off-center holes in records by moving the platter in two dimensions. The Dragon CD playing system has special mechanical damping to prevent vibrations of the CD and holds multiple CDs.
With the coming of stereo (two speakers) and surround sound (four or more), plain horns became even more impractical. Various speaker manufacturers have produced folded low-frequency horns which are much smaller (e.g., Altec Lansing, JBL, Klipsch, Lowther, Tannoy) and actually fit in practical rooms.
Olson used line array concepts to develop the column speaker in which vertically aligned drivers in a single enclosure produced mid-range output in a wide horizontal and narrow vertical pattern. Line arrays have been around for over half a century but until recently most were voice range only.