Now that we can store audio with high resolution, what will it take to reproduce it with high accuracy? 10/29/2019 www.linkwitzlab.com
Minimize any cue that falsifies the perception of the original Electronic Electro-mechanic Room/speaker acoustic 10/29/2019 www.linkwitzlab.com
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 10/29/2019 www.linkwitzlab.com
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 10/29/2019 www.linkwitzlab.com
Room acoustics and 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 10/29/2019 www.linkwitzlab.com
Distortion Linear distortion => Attenuation, amplification & phase shift of original spectral components independent of their amplitude Non-linear distortion => Generation of inter-modulation and harmonic spectral components 10/29/2019 www.linkwitzlab.com
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 10/29/2019 www.linkwitzlab.com
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 10/29/2019 www.linkwitzlab.com
Room/speaker acoustic For high accuracy reproduction minimize any cue that falsifies the perception of the original Electronic Electro-mechanic Room/speaker acoustic 10/29/2019 www.linkwitzlab.com