Pioneer DEH-80PRS Operation Manual page 28

Section
02 Operating this unit
WARNING
As a loud tone (noise) may be emitted from the
speakers when measuring the car's interior
acoustic characteristics, never perform auto TA
or auto EQ while driving.
CAUTION
! Thoroughly check the conditions before per-
forming auto TA and EQ as the speakers may
be damaged if these functions are performed
when:
— The speakers are incorrectly connected.
(For example, when a rear speaker is con-
nected as a subwoofer output.)
— A speaker is connected to a power amp de-
livering output higher than the speaker's
maximum input power capability.
! If the microphone is placed in an unsuitable
position the measurement tone may become
loud and measurement may take a long time,
resulting in battery drainage. Be sure to place
the microphone in the specified location.
Before operating the auto TA and EQ
function
! Perform auto TA and EQ in a quiet place,
with both the car engine and air condition-
ing switched off. Also turn off any car
phones or portable telephones in the car, or
remove them from the car. Sounds other
than the measurement tone (such as sur-
rounding sounds, engine sound, tele-
phones ringing) may prevent correct
measurement of the car's interior acoustic
characteristics.
! Be sure to perform auto TA and EQ using
the supplied microphone. Using another
microphone may prevent measurement, or
result in incorrect measurement of the
car's interior acoustic characteristics.
! In order to perform auto TA and EQ, the
front speaker must be connected.
! When muting the front speaker units, auto
TA and EQ cannot be carried out. (Refer to
page 25.)
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! When this unit is connected to a power
amp with input level control, auto TA and
EQ may not be possible if the power amp's
input level is set below the standard level.
! When this unit is connected to a power
amp with an LPF, turn this LPF off before
performing auto TA and EQ. Also set the
cut-off frequency for the built-in LPF of an
active subwoofer to the highest frequency.
! The time alignment value resulting from
auto TA and EQ has been calculated by a
computer and is the optimum delay time
that will give accurate results. Be sure to
use the resulting value although it may dif-
fer from the actual distance when:
— The reflected sound within the car is
strong and delays occur.
— The LPF on active subwoofers or exter-
nal amps delay the lower sounds.
! Auto TA and EQ changes the audio settings
as follows:
— The fader/balance settings return to the
center position. (Refer to Using fader/
balance adjustment on page 20.)
— The graphic equalizer curve switches to
Flat. (Refer to page 26.)
— When a subwoofer is connected to this
unit, it will be adjusted automatically to
both subwoofer output and high pass fil-
ter setting for rear speaker.
! Previous settings for auto TA and EQ will be
overwritten.
! When connecting tweeters, please confirm
the tweeter's usable frequency range.
When you set the cut-off frequency, set
higher than the lowest usable frequency of
the tweeter.
! Auto TA uses higher range than 10 kHz for
measurement. Therefore, using the tweeter
that cannot reproduce 10 kHz frequency
range may damage the tweeter. When auto
TA and EQ is operated, be sure to set the
appropriate cut-off frequency. Also, use the
tweeter that can reproduce 10 kHz at the
lowest usable frequency.