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The Aesthetix IO Signature Phono Stage Preamplifier is in a league of its own.
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crossover (crossover)

A crossover is a kind of circuit devised in such a way as to divide the audio signal arriving into a loudspeaker into frequency ranges, then routing those respective signals to a destination most accommodating to that frequency range, such as a speaker driver. A 'tweeter' device receives high frequency signals, while a 'mid-range' driver receives lower frequency signals. Crossovers play a vital role in the fidelity of loudspeakers, car audio, power amplifiers and even electronic musical instruments.