Yamaha NOT FOND DSP-Z11 - Manual (Page 135)

Parametric equalizer information
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This unit employs Yamaha Parametric Room Acoustic Optimizer
(YPAO) technology, together with the Parametric EQ settings (see
page 87), to optimize the frequency characteristics of its parametric
equalizer to match your listening environment. YPAO uses a
combination of the following three parameters (Frequency, Gain
and Q factor) to provide highly precise adjustment of the frequency
characteristics.
■ Frequency
This parameter is adjustable in one-third octave increments between
32 Hz and 16 kHz.
■ Gain
This parameter is adjustable in increments of 0.5 dB between –20
and +6 dB.
■ Q factor
The width of the specified frequency band is referred to as the Q
factor. This parameter is adjustable between the values 0.5 and 10.
YPAO adjusts frequency characteristics to suit your listening
requirements using a combination of the above three parameters
(Frequency, Gain and Q factor) for each equalizer band in this unit’s
parametric equalizer. This unit has 7 equalizer bands for each
channel.
The use of multiple equalizer bands enables more precise
adjustments of frequency characteristics (as in Figure 2). This is not
possible using only a single equalizer band (as in Figure 1).
Figure 1
Figure 2
■ Standing wave
A wave generated when two waves of the same length, frequency
and speed but traveling in opposite directions overlap. Standing
waves appear to be stationary and simply oscillating in a fixed
position without progressing.
Under certain conditions, the sound leaving a speaker and the sound
reflecting off a wall, etc., in a room resonate. When this happens, it
has a major effect on the frequency response in the room, and
depending on the listening position sounds of specific frequencies
may sound loud or inversely may be hard to hear. As a result, this
hampers accurate reproduction of the sound source.
This unit is equipped with a parametric equalizer to reduce the
effect of standing waves. The equalizer’s settings can be optimized
through automatic measurements. Even more accurate settings can
be made by taking measurements at other positions.
Parametric equalizer information
Gain
Frequency
Original frequency
characteristic
Band 1
Frequency
characteristic after
correction
Gain
Frequency
Band 1
Band 2
Frequency
characteristic after
correction
Original frequency
characteristic