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    Results of stacking THD+N?

    I was wondering the other day... What is the maths behind compound noise and distortion in the audio path? Let's say we have streamer that has SINAD of 70dB and a processor that has SINAD of 70dB. What can one expect after signal gets through both of them? Should I just use the dB...
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    Is there easy way to measure speaker impedance

    Is there an easy way to, without more sophisticated equipment, measure the speaker impedance at certain frequency? Let's say I have a frequency generator (read 'a laptop'), a DC/AC multimeter and an amplifier... ??
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