Audio Database

The

Pioneer C-AX10
550,000 (2000 release)

Description
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Digital control amplifier with a built-in digital dividing network announced as reference control amplifier of a next-generation reproducible without the place which leaves the high-quality sound of a DVD-Audio.

The digital analog converter corresponding to 192kHz/24bit is carried in all the outputs of six channels. Two fronts were carried in a high region and low-pass each for the output of a channel dividing network, and have equipped a total of eight digital analog converters. These have realized the highly precise D-A conversion corresponding to a high sampling.

Furthermore, quality improvement of a digital analog converter, 192kHz/24bit digital filter, DSP, an analog-to-digital converter, etc. is put into practice and investigated.

The transmit error of L and R channel is suppressed as much as possible for the analog audio-output part by L and taking R each for an independent substrate, and putting into practice and eliminating the cross interferencee between right-and-left signals.

The flexible A/D-D/A system is carried, eight digital analog converters are operated by tone-quality first priority, and high-quality sound-ization is attained.
At the time of the usual two-channel output, it uses four pieces at a time for low-pass and each two high regions by parallel at the time of parallel and the digital dividing network output of two channels. At the time of the digital dividing network output of two fronts, it distributes remaining four pieces one piece at a time to each channel (the case of six channels which added the center and the rear A subWoofer), the high region of Fronts L and R, and low-pass.
Moreover, the improvement in a tone quality or an SN ratio is realized by the thing which will set every three analog-to-digital converters for six channels for analog inputs to L and R at parallel, respectively at the time of the usual two-channel input and to do.

The analog-to-digital converter corresponding to 96kHz/24bit is adopted as all the analog inputs of six channels, and digital conversion of the analog source was carried out by the A/D conversion, and it has controlled.
In the case of a two-channel signal, it is possible to choose whether the signal which carried out the A/D conversion does not change by 96kHz/24 bit, or a down convert is carried out by DSP at 48kHz/24 bit, and to output from a digital output termination.

The digital tone control functionality by newly developed 192kHz / 24bitDSP is carried.
A front channel, a center channel, and each rear channel are finely controllable in three bands, a high region, a mid range, and low-pass.

The Digital Accurate Control (DAC) volume is adopted as a volume.
The precision resistor in digital-analog-converter IC is used for a coordination of a volume, and an operation is possible with the sensation of an analog volume.
Thereby, while suppressing the decrease guess error between each channel very small, the influence of an oscillation is suppressed. Furthermore, the ideal substrate placement is also attained.

The digital phone equalizer for an analog record play is carried.
By newly developed 192kHz/24bit high-speed DSP, if analog 3 input terminal is changed from a Line input to a Phono input, the digital phone equalizer (RIAA) will operate.

DNR (digital noise reduction) is carried and the noise includeded in an input sound signal by newly developed 192kHz / 24bitDSP is reduced sharply, without spoiling a sound signal.
Three kinds the object for digital inputs, for an analog input, and for FM stereos are carried for DNR which corresponds to the amplifier ring frequency of 96kHz.

Legato linking conversion and Hi-Bit are carried.
Legato linking conversion by 192kHz of new development / 24bitDSP,The signal of the frequency band which is not recorded in a format corresponding to a digital input by 32kHz/44.1 kHz/48 kHz/88.2 kHz/96 kHz is presumed by the damping characteristics of 1/f based on a register signal, and the natural wave is reproduced.
At Hi-Bit, the expansion of a dynamic r screw is realized by re-quantizing from 16 bit data of a digital input to 24 bit data.
Both of the functionalities can be turned on and off.

The digital dividing network is carried for the first time as control amplifier, and the frequency band splitting is realized by the multiprecision-arithmetic treatment of a maximum of 192kHz/48 bit.
Two kinds, an IIR type filter and an FIR type filter, are carried in the band splitting filter. The IIR type filter can carry out variable [ of a cross over frequency or the damping characteristics ]. Moreover, the FIR type filter can eliminate in the former the phase change which was not avoided. Furthermore, carry the time alignment function which can perform high precision level adjustment and a high region and low-pass time-base coordination, and pull out the performance of a speaker system.

The digital time alignment function is carried.
To both an infinite-impulse-response type digital filter and an FIR type digital filter, it is an enable and a coordination of an important time alignment is possible at a multiway loudspeaker system.

A storing and a ringback can perform 16 kinds of tone controls, and a sound field setups of 24 kinds of totals of eight kinds of speaker configurations.
Moreover, it is possible to name and display a free name.

The signal path is put into practice and made simple, and a separation of a signal path, shortest-izing, and a rational stream composition are adopted.
Moreover, a digital system and an analog system are separated and shortest-izing of a signal path and simple-ization are performed.

It has adopted the super ring toroidal transformer as one piece of a digital system / analog system each at a time.
Two super ring toroidal transformers with little leakage flux used as the noise source in a low loss and amplifier were separated completely, and also it stored in the case, and the influence of the noise from a digital system to an analog system is eliminated.

He examined the tone quality by set package after the study carefully, and the element is selected carefully and adopted from the thing excellent in the RF property.

In order to reproduce the high-quality sound of a DVD-Audio, its attention is paid to the electric influence of mutual in the interior of amplifier, and it has the 3LOAD-RESISTOR-BOX-5CHAMBER structure where the copper plating steel plate separated each part.

Conductivity was raised to the chassis, the rear panel, the shielding case, etc., and the high conduction chassis by the copper plating steel plate which stopped the RF noise is adopted.
The potential difference in a chassis becomes low by this, and electric stability is increasing.

The metal plate of the four layers excellent in rigidity is fixed to the chassis base, and a penta, and being layered (five-level structure) and the under base stabilized by carrying out are constituted. Two layers of transformer stabilizers by a wall thickness type copper plating steel plate are added to the installment part of a transformer. Furthermore, the frame of two layers was installed in the orientation of amplifier order, and the intensity of the chassis which is not influenced by the sound pressure from a speaker is secured.
Moreover, the brass (brass) which has the outstanding damping characteristics in the insulator which is a contact fraction with the exterior was adopted, and the unnecessary oscillation from the interior and the outside is eliminated.
Furthermore, the volume knob which began to delete the aluminum of the Naked is adopted.

In order to prevent a failure of the digital source, PDIF (Pioneer digital interface) of the original specification of Pioneer transmitted in digital one until just before a D-A conversion is adopted.

Multi-control remote control is attached.

Rear
Internal
3Box-5Chamber
Digital-analog-converter
The Multi-control Digital
Digital
Five-level
Block

Rating of a mode
Form Digital control amplifier
<Amplifier part>
Quantifying bit number Digital input: 16 bits - 24 bit and a linear
Analog input: 24 bit and a linear
Sampling frequency Digital input: 32kHz, 44.1kHz, 48kHz, 88.2kHz, 96kHz, 176.4kHz, 192kHz
(It corresponds only at an autmatic detection however 176.4kHz, and 192kHz of the times of a PDIF interconnection)
Analog input: 96kHz
Frequency characteristic
Digital input : 5Hz - 88kHz (fs 192kHz)
Analog input Line: 5Hz - 44kHz
Phono man month: 20Hz-20kHz}0.3dB (direct-on)
SN ratio (Normal, 2ch mode) Digital input: 120dB or more (auditory sensation weighting)
Analog input Line: 115dB or more (an auditory sensation weighting and Phono remove)
Dynamic range (direct-on)
Normal, 2ch mode
Digital input: 110dB or more
Analog input: 108dB or more (Phono removes)
THD (direct-on)
Normal, 2ch mode
Digital input: 0.0010% or less
Analog input: 0.0012% or less (Phono removes)
Channel separation 115dB or more (20kHz, 2ch mode, digital input)
Tone control }6dB, a 0.5dB step
Bass: 150Hz, 300Hz
Mid: 400Hz, 500Hz, 630Hz, 800Hz, 1.0kHz, 1.2kHz
Treble: 3kHz, 10kHz
Analog input termination Four RCAs (one of them is a six-channel input correspondence)
Analog output terminal
Pre out Front: Two RCAs
Surround: One RCA
Center: Two RCAs
SubWoofer: Two RCAs
Rec out: Two RCAs
Digital input termination Coaxial (Coaxial): Three lines
Light (Optical): Three lines
Digital output termination Coaxial (Coaxial): One line
Light (Optical): One line
<Dividing network part>
Cross over frequency infinite impulse response: Up to 70Hz - 24kHz. It is a High/Low independent setups possible from 25 points.
FIR: Four points, 500Hz, 650Hz, 800Hz, and 1kHz
High channel
Time alignment coordination
IIR 0 - a }2.00msec:0.01msec step (3.4mm step)
}2.00msec - }8.00msec:0.20msec step (6.8cm step)
FIR 0 - a }2.00msec:0.01msec step (3.4mm step)
}2.00msec - }8.00msec:0.20msec step (6.8cm step)
The slope property of a filter infinite-impulse-response: 0, -6, -12, -18, -24, -36, -96 dB/oct, a High/Low independent setups possible
FIR High:-12dB/oct
Low:-36dB/oct
Level adjustment of High and Low infinite-impulse-response: 0--25dB, a 0.1dB step
FIR: 0--25dB, a 0.1dB step
High channel phase selection infinite-impulse-response: 0-degreeor180"
FIR: 0-degreeor180"
<Others>
Supply voltage AC100V, 50Hz/60Hz
Power consumption 45W
Dimensions Width 440x height 150x depth of 410mm
Weight 22.2kg
Adjunct Multi-control remote control