From
http://ca.yamaha.com/en/products/audio-visual/av-receivers-amps/rxa-series/rx-a2040_black_u/?mode=model
[h=3]YPAO-R.S.C. (Reflected Sound Control) Sound Optimization with Multi-Point Measurement[/h] YPAO-R.S.C. analyzes room acoustics and measures various speaker characteristics, then calibrates audio parameters to achieve optimum sound at any of eight listening positions. It employs Reflected Sound Control to correct early reflections for studio-quality sound. It also provides DSP Effect Normalisation, which varies the CINEMA DSP parameters according to the reflected sounds.
[h=3]YPAO Volume to Ensure Natural Sounds Even at Low Volume[/h] Human ears have less sensitivity to high and low frequencies, especially at lower volumes. YPAO Volume applies loudness EQ correction to automatically adjust high and low frequency levels as volume changes. Using the YPAO measurement results, EQ correction is optimized to your system settings and listening environment.
[h=3]Extra Bass Provides Rich Bass Reproduction, Even with Small Speakers[/h] Yamaha’ s exclusive low-range enhancement technology delivers richer bass than you expect from the speaker size while maintaining good localisation and sound balance even with compact front speakers. When a subwoofer is used, it improves the volume of the entire low range of the speaker system, not only the front speakers, but also enhancing the bass from the subwoofer. You'll enjoy video and music with sound that has exceptional power and presence.
[h=3]Subwoofer Trim for Improved Sound Imaging[/h]
The Subwoofer Trim control enhances the low frequencies by avoiding overlap with the front speaker output. This will result in a cleaner, more focused sound stage while providing a seamless frequency response. When subwoofer frequency overlap occurs in conventional systems, the overall sound is “pushed” toward the subwoofer. Subwoofer Trim takes care of this by separating the low subwoofer frequencies cleanly, thus stabilising the front stage while providing a well-balanced enhanced bass sound.
