What are input and output levels and impedances for signal sources, preamps, amps, etc?
We have been unable to find any formal standard on this topic. However, there is an EIA Bulletin: EIA Consumer Products Engineering Bulletin No 6-A (CPEB6-A) 1974, titled “Preferred Voltage and Impedance Values for the Interconnection of Audio Products”. The key word in the title is ‘Preferred’. EIA CPEB6-A recommends 3mV at 47k ohms for magnetic phono cartridges, 250mV at less than 10k ohms for tape and preamp outputs, and 100k ohm minimum for tape, tuner, and amp aux inputs. The bulletin also has information on microphones, and headphones. You can order a copy through a technical library or directly from the EIA.
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