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In 2013, Eminence Speaker introduced the D-fend SA300, a fully programmable stand-alone unit designed to protect passive loudspeakers from excessive power conditions. This article was originally published in audioXpress, July 2014. Solving a well-known problem, the RSX-1 allows connecting two turntables or different line level sources without compromising our connections. This is an effective solution to run multiple different sound sources connected to a single-input preamp or integrated amplifier. In this article from audioXpress' Fresh from the Bench, Gary Galo reviews the RSX-1 Remote Analog Switch from KAB Electro-Acoustics. This increases the total capacitance of your tone arm cabling, and can lead to hum and noise problems. A switchbox needs to be within easy reach, which often means a half-meter or more of output cable. High-quality switches and connectors are essential, but the length of the output leads between the switchbox and the phono preamplifier input is a potential source of trouble.
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However, switching audio signals at phono cartridge-levels can be fraught with problems if it's not correctly done. A few high-end turntables enable the mounting of more than one tone arm. Others may have two different turntable/arm/cartridge setups just for LPs. Collectors who play all types of disc records often have two turntables - one for LPs and 45s and another for 78s - but only one phono preamplifier. Running out of inputs on a preamplifier or integrated amplifier can be a problem.
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