1. Now that we can store audio with high resolution, what will it take to reproduce it with high accuracy?
10/29/2019

2. Minimize any cue that falsifies the perception of the original
Electronic
Electro-mechanic
Room/speaker acoustic
10/29/2019

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
10/29/2019

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
10/29/2019

5. Room acoustics and speaker directivity
Resonances Hz
RT60 of ms above 100 Hz
Reflections
Directivity of 0 dB at low frequencies, dB at high frequencies, typically
Box woofers vs. open baffle woofers
Midrange directivity
10/29/2019

6. 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

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
10/29/2019

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
10/29/2019

9. 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