47
highest frequency that can be reproduced is half of
the sampling frequency) the highest frequency that
can be reproduced is 22.05kHz.
The 96kHz D/A converter in the DRZ9255 oper-
ates at twice this frequency, moving the maximum
reproducible frequency up to 48kHz.
What does this mean for the end-user? Any time a
filter is implemented in a circuit, it not only affects
frequency response, but also phase response
(the relative arrival time of different frequencies).
Moving the high frequency roll-off up one octave
higher means that the DRZ9255 can reproduce
high frequencies with coherence, detail and clar-
ity. Clarion was the first company to implement a
96kHz DAC in the car audio industry.
High Voltage Preamplifier Output
A high preamplifier voltage provides reduced signal
clipping, less chance of vehicle electrical noises
altering signals between source unit and amplifier,
and a lower amplifier input gain setting to reduce
system noise levels.
Clarion’s DXZ865MP and DXZ765MP source
units, as well as several processors, feature 4-volt,
low-impedance (less than 330 ohms) outputs that
minimize the possibility of a clipped and distorted
output signal. This results in a much cleaner musi-
cal signal sent to the power amplifier with less rolloff
at the top and bottom of the frequency range. The
end result is musical reproduction with extended
dynamic range and more headroom.
The DRZ9255 offers an 8Vrms pre-amp output for
even better signal to noise performance.
Zero-Bit Detector Mute Circuit
Clarion CD Players feature a zero-bit detection
circuit. This circuit turns off (mutes) both the line-
level and speaker-level outputs when it does not
see a digital signal for more than 750 milliseconds.
Since a digital signal consists of “one” and “zero”
bits, the zero-bit detector will turn off the analog
audio input signal to the preamp section when it
sees a series of zero bits. The purpose of this cir-
cuit is to eliminate tracking noise or background
noise that is typically associated with the decod-
ing of the digital signal to its final analog form.
The zero-bit detector mutes the preamplifier analog
outputs after a series of zero bits exceeds 750-ms.
Audio is restored after a period of one and zero bits
is longer than 57 µs.
Clarion’s Low-Vibration Suspension System
Clarion CD players, CD and DVD changers, fea-
ture an advanced suspension system to prevent
skipping and mistracking. Clarion incorporates a
system of springs and dampeners to minimize
the chances of skipping, whether the unit’s on the
road, off the road, or on the water. Along with the
suspension system, a three-beam laser pick-up
assembly is employed. The center pick-up detects
the digital information that is sent to the D/A con-
verter. The inner and outer pick-ups guide the laser
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