What is Room Acoustic Role in improving Sound Quality of High End Audio Performance?

1. Acoustic Role
Quest for Sound of Audio Lover
Acoustic Role Quest for Sound Audio Lover

2. On left picture is the aspect of what aspect of sound
we have to evaluate. (The Complete Guide to High end
Audio by Robert Harley)
Three of seven aspect can be measured: Tonal
Balance, Dynamic, Timing while the other four is
qualitative aspect.
If Tonal Balance is the most important aspect, how is
room acoustic role in improving tonal balance?
Pace, Rhytm and Timing
Coherence
Musicality
Quest for SoundTonal Balance
SoundStage
Dynamic
Detail
Acoustic Role Quest for Sound Audio Lover

3. Auditory Signal Chain
Content Convert Amplifier Electro
Acoustic
Room
Acoustic
Physio
Acoustic
Psycho
Acoustic
Acoustic Role Quest for Sound Audio Lover

4. Source
frequency response at 0dBFS (top), and with de-emphasis
(bottom). (Right channel dashed, 0.5dB/vertical div)
Naim NA CDS
https://www.stereophile.com/content/naim-na-cds-cd-player-
measurements
Frequency Response.
Acoustic Role Quest for Sound Audio Lover

5. Amplifier
Frequency response at 2.83V into: simulated loudspeaker load
(gray), 16 ohms (blue), 8 ohms (cyan), 4 ohms (magenta), 2
ohms (red). (1dB/vertical div.)
Rogue Audio M-180
https://www.stereophile.com/content/rogue-audio-m-180-
monoblock-power-amplifier-
measurements#oUuvKUkTmFtlyVta.99
Frequency Response.
Acoustic Role Quest for Sound Audio Lover

6. Electro Acoustic
Anechoic response on tweeter axis at 50", averaged across 30°
horizontal window and corrected for microphone response, with
the complex sum of the nearfield midrange, woofer, and port
responses, taking into account acoustic phase and distance from
the nominal farfield point, plotted below 300Hz.
B&W 802 D
https://www.stereophile.com/content/bw-802d-loudspeaker-
measurements#5SxRfKoXcjUJe5ru.99
Frequency Response.
Acoustic Role Quest for Sound Audio Lover

7. Room Acoustic
Dot: worst found
Line: optimized
Line Dotted: Bolt 2:3:5
Cox et al, Room Sizing and Optimization, J. Audio Eng. Soc., Vol.
52, No. 6, 2004 June
Frequency Response.
Acoustic Role Quest for Sound Audio Lover

8. Comparison
Source Amplifier Speaker Room Acoustic
Dip and Peak Frequency Deviation.
Acoustic Role Quest for Sound Audio Lover
20-50 dB3-15 dB2-10 dB1-5 dB
Accessories
N.A.

9. Physio AcousticFrequency Response.
Acoustic Role Quest for Sound Audio Lover
Fletcher Munson Curves
https://en.wikipedia.org/wiki/Fletcher–Munson_curves

10. Psycho Acoustic
Acoustic Role Quest for Sound Audio Lover

11. Conclusion
Acoustic Role Quest for Sound Audio Lover