DENON PMA-890D/PMA-890DG
PMA-890D : ¥ 89,800 (released in 1989)
PMA-890DG : ¥ 93,800 (released in 1989)
Commentary
Pre-main amplifier with real 20-bit S. L. C and optical ClassA circuit.
The D/A converter is equipped with a real 20-bit super-linear converter with independent left and right channels.
It receives a 20-bit 8 x over-sampled signal produced by a digital filter and performs excellent D/A conversion.
The digital multi-interface circuit automatically identifies the difference in sampling frequency between CD, DAT and satellite broadcasting, and eliminates the influence of jitter (temporal fluctuation of digital signals) by using a powerful 2 PLL configuration for the internal clock required for demodulation.
The P. B. S (Penta Block Separated) chassis structure, which separates the amplifier into five blocks for each basic circuit, prevents magnetic flux from the power supply block and digital noise from the digital block and display block from jumping into other circuits.
In addition, interference between the minute signal part and the large extension Gobu is resolved, and at the same time, unnecessary minute vibration is suppressed by greatly improving the chassis rigidity.
An optical ClassA circuit is newly installed in the power amplifier section.
This circuit is a class A circuit that uses an optical element to transmit the control signal sent from the bias control circuit to the bias circuit, and eliminates the interference between the main signal system and the bias control circuit.
The voltage amplification stage, which is important for driving the power amplification stage, uses three differential amplification stages and the first stage uses an ultra-low noise FET to achieve low noise and DC amplification. The final stage of the power amplifier uses a Pc80W high-speed, large-capacity transistor in parallel push-pull.
The power supply unit has enhanced instantaneous response capability.
The power transformer employs a 6.3 kg heavy weight large shielded power transformer, a high-class large rectifier and electrolytic capacitor, and a 2-2 pure dynamic circuit that blocks power supply noise.
Equipped with a wide-range MC/MM equalizer amplifier that employs a DC servo system.
It is equipped with a source direct switch that can connect all input sources directly to the power amplifier, broadband real-time tone control, protection relay speaker terminal switching, and reset-type high-speed protection circuit.
There are gold type with side wood and black type.
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Model Rating
| Type | Pre-main amplifier with digital multi-interface |
| <Power Amplifier Section (Line terminal → SP terminal)> | |
| Rated Output (20 Hz ~ 20 kHz) | 130W + 130W (6 Ω) 110W + 110W (8 Ω) |
| Input Sensitivity / Impedance | CD Input : 150mV/30k Ω |
| Total harmonic distortion factor | 0.004% (20 Hz to 20 kHz, 55W, 8 Ω) |
| Dynamic Power | 350W (2 Ω) 275W (4 Ω) 170W (8 Ω) |
| TIM Distortion | Measurement limit value or less |
| Output bandwidth | 5 Hz to 100 kHz (55W output, 0.5%, 8 Ω) |
| Line input frequency characteristic | 4 hz ~ 150 khz, + 0 -3dB (Output 1W, 8 Ω) |
| Output impedance | 0.1 Ω or less |
| Output terminal | Speaker : AORb : 6 ~ 16 Ω, A + B : 12 ~ 16 Ω Headphone Jack Maximum Output : 430 mW (8 Ω), 8 ~ 400 Ω Compatible |
| <Digital Interface / DAC Part> | |
| Digital input / output level / impedance | 0.5Vp-p/75 Ω Coaxial Standard optical input : 2 systems |
| Frequency response (0 dB) | 5 Hz to 20 kHz ± 0.3 dB |
| Signal-to-noise ratio (vs. 0 db, 1 khz) | 105dB |
| Dynamic Range (1 kHz) | 100dB |
| Total harmonic distortion factor (0 dB, 1 kHz) | 0.0025% |
| Preamplifier Section | |
| Input Sensitivity / Impedance | Phono MM : 2.5mV/47k Ω Phono MC : 0.2mV/100 Ω CD, AUX, Tuner, Tape1, 2 pb : 150mV/30k Ω |
| Maximum Output / Rated Output | 8V/150mV |
| Total harmonic distortion factor | 0.002% (MM, 1 khz, 8 v) |
| Equalizer (RIAA) deviation | 20 Hz to 50 kHz ± 0.3 dB (MCIN) |
| <General> | |
| SN ratio (input ratio (input short-circuit, auditory sense compensation A) | Phono MM:82dB Phono MC : 62 dB (at 0.25 mV input) Line:108dB |
| Tone control characteristics | Bass : ± 8 dB (100 Hz) Treble : ± 8 dB (10 kHz) |
| Subsonic filter | 16 Hz, -12dB/oct. |
| Loudness control characteristic | 100Hz:+6dB 10kHz:+6dB |
| Muting switch | -20dB |
| Power consumption (Electrical Appliance and Material Control Law) | 216W |
| Pwer | 100 VAC, 50Hz/60Hz |
| External dimensions (including foot, knob, terminal, etc.) |
PMA-890D : Width 434x Height 180x Depth 420 mm PMA-890DG : Width 470x Height 181x Depth 420 mm |
| Weight | PMA-890D:18kg PMA-890DG:19.4kg |