5
AV RECEIVERS REFERENCE GUIDE
Audio T
echnologies
Video T
echnologies
Audio Formats & Licenses
Sophisticated Surround System
Connectivity
Network Features
Advanced Control
Audio Technologies
Reflex Optimizer
1131
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.
384 kHz/32-bit AKM DAC (AK4458)
1131
831
The AV receivers feature AK4458, a 384 kHz/32-bit premium
audio DAC from AKM (Asahi Kasei Microdevices Corporation).
With the latest low-distortion technology, the DAC provides
detailed and clear sound, ideal for Hi-Res Audio playback. The
32-bit digital filter creates natural and detailed sound.
Anti-Standing Wave Insulator
1131
831
The Anti-Standing Wave Insulator has been developed through
repeated listening tests, featuring a special form with no
parallel sides inside to prevent cavity resonance. This makes the
sound localisation, tone, and scale clearer, while also enhancing
the seamless connection between the channels, and the
response to quick sound.
Advanced Sound Retriever
1131
831
531
Pioneer’s AV receivers feature the Advanced
Sound Retriever, which restores the output of
compressed audio—such as WMA, AAC, and
MP3—to the level of CD sound. The Advanced Sound Retriever
creates new signals to restore the minor details left out during
the compression process.
Direct sound from floor 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
Reflected sound from Dolby-enabled speaker
Direct sound from Dolby-enabled speaker
Insulator (VSX-1131)
