Earlier this year, I dedicated columns to compact audio system tools from TerraSonde and SIA Software. With Meyer Sound's SIM 3 now shipping, it's a good time to take a peek at this highly respected diagnostic instrument. SIM, or Source Independent Measurement, is a three-channel technique that can use either live music or test signals to compute the transfer function — the system's affect on the signal — of a room or speaker system. To generate a transfer function, SIM takes two reference
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