Operation - Pioneer CT-W801R Service Manual

10.1 Purpose
10.2 Operation
10.3 Features
20 30 100 200 500
CT-W801R, CT-W851R, CT-W701R'
10.4 Recording Frequency Compensation
for Car Stereo Applications
There are many restrictions on where and how speakers can be
installed in a car due to the complex configuration of the car
interior and its small capacity of around 3 m quite small
compared with a normal audio listening room. Under these
circumstances, car speakers tend to have small-di-ameter
diaphragms. Also, depending on the details of the installation,
there may be a great deal of noise that leaks in from behind the
speakers. Both of these factors work against the effective
reproduction of low frequency sounds.
In addition, the sound spectrum of the noise produced when a
car is running shows an increase in intensity at the low end of the
frequency range. This low range noise tends to mask the
bassportion of the music being played through the speakers. In
order to improve the low frequency characteristics peculiar to
cars, Sound EQ boosts the level of a frequency band centering on
the frequencies between 40 and 50 Hz.
There is also a tendency for treble reproduction to be insufficient
in card due to poor speaker orientation and the presence of
objects such as seats that absorb high frequency sounds. To
compensate for this, a slight boost in the high range is also added
in order to create a sense of increased spaciousness,
10.5 Recording Frequency Compensation
for Portable Stereo Applications
The headphones used with portable stereos can not match the
bass response of full-sized room speaker systems due to factors
such as the smallness of their driver diaphragms, the point at
which the electrical music signal is converted int) sound waves.
To compensate for this, Sound EQ boosts the frequencies
centered around 70 Hz. Also, the high frequeny reproduction
characteristics of headphone stereos are generdly inferior to
those of standard cassette decks due to factors such as head
azimuth misalignment, which can easily occurif the unit is
dropped or bumped. To compensate for this, a slight boost in the
high range is also added to provide added ambience.
1000 2000 5000 10000
FREQUENCY RESPONSE (LINE) MPX ON
iL