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The SDI allows the speaker output of an instrument amplifier to be interfaced to the mic input of a sound system. By using the amplifier speaker output, the distortion characteristics of the amplifier are preserved. The SDI attenuates the speaker level signal so that it can be interfaced to a mic input.
Caution: Vacuum tube amplifiers require a speaker or equivalent resistive load on their outputs to prevent damage to their output transformer. Do not operate your tube amplifier without a speaker connected. Peavey item 03001350.