Audio Database

The pictorial image of Integra A-2001

ONKYO Integra A-2001
280,000yen(November, 1988 release)

Description
 
It is the Integrated Amplifier which combined the amplifying circuit of a high purity, and the simple propagation circuit, and also built in the digital analog converter.

The newly developed optical drive system is adopted as a power amplifier part.
By this scheme, if light is glared for the criteria electric current of a first rank differential-amplification circuitry, it will have obtained from the photoelectromotive-force element which generates a fixed voltage, and acquiring the criteria electric current of a precision higher than the conventional scheme is performing highly precise V-> I conversion.

The parallel push pull scheme constituted from four Oide power transistors of the collector loss 150W is adopted as the final stage of a power block, and the generous output is realized.

In the power-source part, in order to prevent an interference taking place between an analog circuit and a digital circuit, the power transformer for exclusive use is used for digital circuits. The object for analog circuits carries the overly large-sized power transformer of sub- side five-line another coil.
Moreover, compared with a thing general in a rectification smoothing circuit, the resistance value has adopted eight low impedance twin roll chemicons (96,000 micro F) called 1/3 and the quick high-speed rectifier diode of a recovery time, and the stable current supply source is performed.

In order to prevent the ill effect by oscillation, the high carbon steel rigid chassis which was excellent in oscillating dissolution capacity with increased specific gravity and a quantity mass is adopted, and all the component partses, such as a power transformer and a substrate of an amplifying circuit, are carried on this foundation.
This chassis has taken the six-point setting structure, and the setting stabilized by distributing the weight of Integra A-2001 with a sufficient balance is guaranteed.

In order to prevent distortion by the cross interferencee of each circuitry, the 4-block perfect separation construction is adopted.
A power-source block is first arranged at the edge of a TAP box, and a shielding board separates completely, and also an optical drive D/A converter and a digital treatment circuitry are enclosed with the copper plating case by which the electromagnetic shielding was carried out, respectively, and the separation is carried out to the sub- contrary to a power-source part.

Newly developed real 18 bit and, and optical drive twin digital analog converter are carried in the digital circuit.


Rating of a mode
Form Digital basic amplifier
<Amplifier part>
Output power (20Hz - 20kHz)
compact disk->sp out, both channel drive
170W+170W (6ohm)
150W+150W (8ohm)
Dynamic power 490W+490W (2ohm)
350W+350W (4ohm)
220W+220W (6ohm)
THD (20Hz - 20kHz) compact disk->sp out: 0.004% (at the time of an Output power 8ohm)
phono man month->rec out: 0.003% (at the time of 3V output)
phono MC->rec out: 0.015% (at the time of 3V output)
Cross modulation distortion (20Hz - 20kHz) compact disk->sp out: 0.004% (at the time of an Output power)
Power Band Width 5Hz - 100kHz (IHF-3dB, THD 0.2%, 8ohm)
Dumping factor (1kHz, 8ohms) 100
Frequency characteristic phono->rec out(RIAA deflection): 20Hz-20kHz±0.2dB
compact disk->sp out: 2Hz-100kHz+0 -3dB
Input sensitivity/impedance phono man month: 2.5mV / 47kohm
phono MC: 160 microvolts/220 ohms
compact disk, others : 150mV / 47kohm
Phono maximum permissible input
(1kHz/10 kHz, 0.005%)
MM:210mV/1000mV
MC:15mV/75mV
An Output-power voltage / impedance tape rec, other:150mV/560 ohm
pre out: 1V/600 ohm
Image input/output VCR, other:1 Vp-p/75ohm
SN ratio (IHF-A filter input short-circuit) phono man month: 95dB (5mV input)
phono MC: 77dB (0.5mV input)
compact disk, other:107dB
The tone control maximum variation
(Volume -16dB)
bass: ±10dB
treble: ±8dB
contrabass:+10dB
Muting (Volume below center) -20dB
<DAC section>
Digital input/output Electrical: 1 Vp-p/75ohm
Optical:TOSLINK standard
Sampling frequency 32kHz, 44.1kHz, 48kHz
THD (1kHz, 0dB o'clock) 0.002%
Dynamic range 100dB
<Synthesis>
Supply voltage AC100V, 50Hz/60Hz
Power consumption (Electrical Appliance and Material Control Law) 270W
AC outlet switched: Two lines, a total of 200W
unswitched: Two lines, a total of 200W
Dimensions Width 477x height 183x depth of 453mm
Weight 32.0kg