500 Series Discrete Class "AB" Microphone Preamplifier (pictured with optional IMOD Upgrade, not included in base price, see below)
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The 581 is a 500 series, discrete, Class ‘AB’ mic preamp module with an extraordinary sonic signature never before obtained at this price level. Its clarity and incredibly solid low end is reminiscent of renowned classic designs. Rich, warm, and musical, the 581 provides detailed results.
Model 581 Features