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High-Resolution Audio Reproduction: Achieving Accuracy

Discover the key factors for achieving high-accuracy reproduction of high-resolution audio, including electronic and electro-mechanic elements, room and speaker acoustics. Explore implications for the recording industry, home theater setups, speaker layouts, loudspeaker issues, room acoustics, distortion in loudspeakers and electronics, and more.

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High-Resolution Audio Reproduction: Achieving Accuracy

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  1. Now that we can store audiowith high resolution,what will it take to reproduce itwith high accuracy? www.linkwitzlab.com

  2. Minimize any cuethat falsifiesthe perception of the original • Electronic • Electro-mechanic • Room/speaker acoustic www.linkwitzlab.com

  3. Six-channel speaker layout • Implications for the recording industry • Home theater 5.1 arrangement ? • LFE channel ? • Pro and con of Lf - C - Rf layout • 2 Front + 2 Side + 2 Rear speakers www.linkwitzlab.com

  4. Loudspeaker issues • All speakers full range • At least 2 derived woofer channels for small speakers • Standardized 100 Hz, -6 dB/oct woofer to midrange channel crossover • Standardized woofer level settings • Directivity www.linkwitzlab.com

  5. Room acousticsand speaker directivity • Resonances 20 - 200 Hz • RT60 of 400 - 700 ms above 100 Hz • Reflections • Directivity of 0 dB at low frequencies, 10 - 15 dB at high frequencies, typically • Box woofers vs. open baffle woofers • Midrange directivity www.linkwitzlab.com

  6. Distortion • Linear distortion =>Attenuation, amplification & phase shift of original spectral componentsindependent of their amplitude • Non-linear distortion =>Generation of inter-modulation and harmonic spectral components www.linkwitzlab.com

  7. Distortion in loudspeakers • At 70 dB SPL & 90 dB SPL, 1m • Stored mechanical energy • Ability to reproduce high levels • Directivity vs. frequency • Uniformity of on-axis & off-axis response • Phase tracking between speakers www.linkwitzlab.com

  8. Distortion in electronics • Amplifier IMD <60 dB at 10 mW & 1 W,clean recovery from clipping • Zero crossing (impulsive) distortion • Jitter (phase noise) of D/A • Immunity to conducted & radiated RFI • Residual noise and hum www.linkwitzlab.com

  9. For high accuracy reproduction minimize any cuethat falsifiesthe perception of the original • Electronic • Electro-mechanic • Room/speaker acoustic www.linkwitzlab.com

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