Pioneer SC-LX901 Product Reference Manual page 8

Multi-Channel Stereophonic Philosophy
For Dolby Atmos-Enabled Speakers
Reflex Optimizer LX901 LX801 LX701 LX502
High directivity sound reflects
off the ceiling, while low
directivity sound directly
reaches the ears. When using Dolby-enabled speakers, this
difference causes a phase shift, making the sound feel
uncomfortable. To solve this, the Reflex Optimizer optimizes
the performance of your up-firing elevation speakers for your
listening environment, by aligning the phase of direct and
indirect sound, matching the basic tone, and optimizing the
upward-oriented frequencies. The result is overall seamless
sound with Dolby-enabled speakers, allowing the ideal
reproduction of three-dimensional surround sound.
Direct sound from floor speaker
Reflected sound from Dolby-enabled speaker
Reflex Optimizer OFF: direct sound reaches the listener first
Reflex Optimizer ON: direct sound, reflected sound, and sound from the floor speaker
simultaneously reach the listener
Direct sound from Dolby-enabled speaker
Bass Management System
When using Dolby-enabled speakers, the low-frequency
components are usually all redirected to the subwoofer. Since
this will include frequencies featuring directivity, the resulting
sound lacks a seamless feel. MCACC Pro redirects the low
frequency component with directionality to the floor speaker
below the Dolby-enabled speaker element, and the lower
frequency components to the subwoofer. This optimal signal
distribution creates superior sound localisation, maximising
the advantage of Dolby Atmos content.
Pioneer
80 Hz
Deep Bass
Dolby-enabled
Bass
speaker sound
component
3 Parts
Other Brands
20 Hz 20 kHz
Bass
Deep Bass
2 Parts
Without Bass Management No horizontal sound localisation
Mid-high range
auditory sound
image
With Bass Management Horizontal sound localisation achieved
8
AV RECEIVERS REFERENCE GUIDE
LX901 LX801 LX701 LX502
Mid-High
180 Hz
Bass
Mid-High
Deep
Bass Subwoofer
Mid-High
150 Hz
Mid-High
Bass
Subwoofer
Deep Bass
Low range
auditory sound
image
Ideal sound image =
Auditory sound image