Digital coaxial vs digital optical

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  • HBombToo
    HBombToo Posts: 5,256
    edited June 2004
    Originally posted by TheGrayGhost
    You can't and many people can't knowingly hear above 17kHz.

    agreed but can WE hear a combination of frequencies that mix down from the higher bands? ie. a 20k with 5k turns into 15k and 25k? in that scenario a driver with a response out to 25k is necessary... or am I just way off base?

    Twin
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  • TheGrayGhost
    TheGrayGhost Posts: 196
    edited June 2004
    Originally posted by HBombToo
    agreed but can WE hear a combination of frequencies that mix down from the higher bands? ie. a 20k with 5k turns into 15k and 25k? in that scenario a driver with a response out to 25k is necessary... or am I just way off base?

    Twin

    Hbomb,

    Actually you’re dead on the money. What you have described is an important test specification when designing audio hardware. It is call IMD (Inter-modulation Distortion) and unlike HD (Harmonic Distortion) is not a harmonic of the primary frequency and does not sound musical. IMD can be additive or subtractive, but not both for the same frequencies.

    I don’t believe IMD can be applied to the pressure wave once the electrical wave has been converted by a transducer. Once turned loose in a room you have a whole new can of worms to deal with (room modes).
    Best Regards, Cliff
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