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"Thanks for your work on my recent order. As an audio engineer, I understand how hard it is sometimes to 'retrieve' good sound from old vinyl from the '50's and '60's. (hell, we all used to roll joints on those double albums ;-}) Just wanted to say thanks for your good work!"

ABC (automatic bass compensation)

Abbreviation for automatic bass compensation; a circuit utilized in some audio equipment to increase the amplitude of the bass tones and make them sound more natural at low volume levels.