In what way would a passive DI running into a power amp work? There needs to be an additional gain stage somewhere. There are active DIs that will drive a power amp directly, but most have some additional controls too, I think. Many folks find a modicum of control desirable.This
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into this
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into this
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into the cab of your choice will produce sound without all the unnecessary knobs.
some like knobs to adjust to the room or to get their desired tone but those are a minority here.