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Are the 1k resistors necessary?

Are the 1k resistors necessary in this Build? Wouldn't this work without these resistor and just be a little Louder? What purpose do they Serve? Thanks.

randofo26 days ago

They prevent distortion and possible device failure. The beginning of this article gives a simple summary of what is going on:

http://www.all-electric.com/schematic/simp_mix.htm