Pioneer SC-LX90 - Manual (Page 14)

Simple Home Theater Guide 02
14
En
For other details, see Listening modes with different input
signal formats on page 141. If the display does not
correspond to the input signal and listening mode, check
the connections and settings.
4 Use the volume control to adjust the volume level.
Turn down the volume of your TV so that all sound is
coming from the speakers connected to this amplifier.
Better sound using Phase Control and
Full Band Phase Control
This amplifier is equipped with the two types of functions
that correct phase distortion and group delay: Phase
Control and Full Band Phase Control. Activating Full
Band Phase Control is strongly recommended because it
also involves the effects of Phase Control. For details on
each of these two features, refer to the following
explanations.
Using Phase Control
During multichannel playback, LFE (Low-Frequency
Effects) signals as well as low-frequency signals in each
channel are assigned to the subwoofer or other the
subwoofer and the most appropriate speaker. At least in
theory, however, this type of processing involves a group
delay that varies with frequency, resulting in phase
distortion where the low-frequency sound is delayed or
muffled by the conflict with other channels. With the
Phase Control mode switched on, this amplifier can
reproduce powerful bass sound without deteriorating the
quality of the original sound (see illustration below).
Phase Control OFF
• Rhythms blurred and difficult to hear
• Bass sound with loss of depth
• Sound of musical instruments with no reality
Phase Control ON
• Rhythms with crystal-like clarity
• Bass sound with no loss of depth
• Sound of musical instruments with superb reality
Phase Control technology provides coherent sound
reproduction through the use of phase matching
1
for an
optimal sound image at your listening position. The
default setting is on and we recommend leaving Phase
Control switched on for all sound sources.
• Set the operation selector switch to AMP, then
press PHASE (PHASE CONTROL) to select PHASE
CONTROL.
The PHASE CONTROL indicator on the front panel lights.
Using Full Band Phase Control
The Full Band Phase Control feature calibrates the
frequency-phase characteristics of the speakers
connected.
Standard speakers designed exclusively for audio use
generally reproduce sound with the divided frequency
bands output from a speaker system consisting of
multiple speakers (in case of typical 3-way speakers, for
instance, the tweeter, the squawker (midrange), and the
woofer output sound in the high-, middle-, and low-
frequency ranges, respectively). Though these speakers
are designed to flatten the frequency-amplitude
characteristics across wide ranges, there are cases
where the group delay characteristics are not effectively
flattened. This phase distortion of the speakers
subsequently causes group delay (the delay of low-
frequency sound against high-frequency sound) during
audio signal playback.
Front speaker
Subwoofer
Sound
source
Sound muffled due
to a delay in time
Listening
position
Note
1 • Phase matching is a very important factor in achieving proper sound reproduction. If two waveforms are ‘in phase’, they crest and trough together,
resulting in increased amplitude, clarity and presence of the sound signal. If a crest of a wave meets a trough (as shown in the upper section of the diagram
above), then the sound will be ‘out of phase’ and an unreliable sound image will be produced.
• The PHASE CONTROL feature is available even when the headphones are plugged in.
• If your subwoofer has a phase control switch, set it to the plus (+) sign (or 0°). However, the effect you can actually feel when PHASE CONTROL is set
to ON on this amplifier depends on the type of your subwoofer. Set your subwoofer to maximize the effect. It is also recommended you try changing the
orientation or the place of your subwoofer.
• Set the built-in lowpass filter switch of your subwoofer to OFF. If this cannot be done on your subwoofer, set the cutoff frequency to a higher value.
• If the speaker distance is not properly set, you may not have a maximized
PHASE CONTROL effect.
• The PHASE CONTROL mode cannot be set to ON in the following cases:
– When the PURE DIRECT mode is switched on.
– When the HDMI audio output parameter is set to THROUGH in Setting the Audio options on page 99.
Front speaker
Subwoofer
Sound
source
Original sound
preserved with no
loss of clarity
Listening
position
SOURCE
TV AMP
VOL
VOL CH
SOURCE
TV AMP
SIGNAL SEL SLEEP AUDIO DIMMER
SR+
CLR
SBch PHASE iPod CTRL
A.ATT GENRE HDMI OUT
MCACC
DISP
CH
PHASE
SC_LX90_WY.book Page 14 Wednesday, February 6, 2008 11:49 AM