DENON PMA-880D
¥ 82,000 (around 1989)
Commentary
Pre-main amplifier equipped with D/A converter.
The D/A converter is equipped with a real 18-bit super-linear converter with independent left and right channels and a 4-times oversampling 18-bit digital filter.
An optical classA circuit is used in the power amplifier section to amplify the music as pure classA until the average level of music, and to amplify it at high output using a non-switching classA method that is effective in improving crossover distortion and switching distortion.
The high-speed bias control circuit controls the amplification method depending on the input level, and an optical element is used to transmit the control signal from the bias control circuit to the power transistor bias circuit. This eliminates interference between the main signal system and the bias control circuit completely, and achieves high-speed bias control.
F at the final stage of the power amplifierT20 MHz, Pc150W high-speed and large-capacity transistor is used in single push-pull.
In the power supply section, the combination of the power amplifier circuit and power supply circuit is strengthened to enhance the instantaneous response capability, and a 6.2 kg shielded power transformer is used as the power transformer.
The main signal and power supply are completely separated by sandwiching a large heat sink, and the left and right channel amplifier circuits are arranged in a symmetrical structure to eliminate differences in characteristics.
Equipped with an MC/MM equalizer amplifier.
.JPG)
Model Rating
| Type | Pre-main amplifier with digital multi-interface |
| Power Amplifier Unit | |
| 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 Characteristics / Dynamic Power (Below TIM Strain Measurement Limit) |
350W (2 Ω) 275W (4 Ω) 170W (8 Ω) |
| Output bandwidth | 5 Hz to 100 kHz (55W output, 0.5%, 8 Ω) |
| Line input frequency characteristic | 4 Hz ~ 150 kHz, + 0 -3dB (1W, 8 Ω) |
| Output impedance | 0.1 Ω or less |
| Output terminal | Speaker : AORb : 6 ~ 16 Ω, A + B : 12 ~ 16 Ω (Terminal B is a direct connection) Headphone Jack Maximum Output : 550 mW (8 Ω), 8 ~ 400 Ω Compatible |
| <Interface / DAC part> | |
| Digital input / output level / impedance | Coaxial : 0.5Vp-p/75 Ω Standard optical input : 1 system |
| 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) | Not more than 0.0025% |
| Preamplifier Section | |
| Input Sensitivity / Impedance | Phono MM : 2.5mV/47k Ω Phono MC : 0.2mV/100 Ω CD, Tuner, AUX1, 2, Tape1, 2, 3 (PB) : 150mV/30k Ω |
| Maximum Output / Rated Output | 8V/150mV |
| Total harmonic distortion factor | 0.002% (MM, 1 khz, 8 v) |
| RIAA deviation | 20 Hz to 100 kHz ± 0.3 dB (MCIN) |
| <General> | |
| SN ratio (input ratio (input short-circuit, auditory sense compensation A) | Phono MM:88dB Phono MC : 69 dB at 0.25 mV input Line : 108 dB |
| Tone control characteristics | Bass : ± 8 dB (100 Hz) Treble : ± 8 dB (10 kHz) |
| Subsonic Filter for Phono | 16 Hz, -12dB/oct. |
| Loudness control characteristic | 100Hz:+6dB 10kHz:+6dB |
| Muting switch | -20dB |
| Power supply voltage | 100 VAC, 50Hz/60Hz |
| Power consumption | 216W |
| External dimensions (including legs, knobs, terminals) | Width 434x Height 172x Depth 395 mm |
| Weight | 15.7kg |