Pioneer A-656 MK II

Data

General

• Manufacturer: Pioneer
• Model: A-656 MK II
• Type: Integrated amplifier
• Years of manufacture: 1990 - 1992
• Made in: Japan
• Colors: Black, Silver (A-656-G MK II)
• Remote control: No
• Power consumption: 650 W max.
• Dimensions: 420 x 162 x 435 mm (WxHxD)
• Weight: approx. 14 kg
• Original price approx.: 800 DM

Connections

• Number of inputs:
  • 1x Phono (Cinch): 2.5 mV / 50 kOhm (MM), 0.2 mV / 100 Ohm (MC).
  • CD, Tuner, Line, 3x Tape In (Cinch): 150 mV / 50 kOhm
• Number of outputs:
  • 3x Tape Out (Cinch): 150 mV / 2,2 kOhm
  • Headphones (6,3mm jack)
  • 2 pairs of loudspeakers

Technical Data

• Continuous power (at distortion factor)
  • 8 Ohm: 2x 80 W (0.005%)
  • 4 Ohm: 2x 120 W (0.008%)
  • 2 Ohm: 2x 160 W (0.008%)
• Dynamic power
  • 8 Ohm: 2x 140 W
  • 4 Ohm: 2x 200 W
  • 2 Ohm: 2x 260 W
• total harmonic distortion: 0.008%
• Attenuation factor: 200 / 70 (8 Ohm, 1 kHz / 20 - 20 kHz)
• Frequency response: 5 - 80,000 Hz (0.05%, 8 Ohm)
• Signal to noise ratio: 95dB / 77dB
• Stereo channel separation:
• Tone control:
  • Bass: yes, ±8db (100 Hz).

Treble: yes, ±8db (10 kHz)

• Loudness: yes, +5 db (100 Hz)/+3 db (10 kHz)
• High Filter: no
• Low Filter (Subsonic): yes, 17 Hz (12 db/oct.)
• Mute: no
• Direct/Line-Straight: yes

Remarks

• Previous model:
• Pioneer A-656

• Successor model:
• Pioneer A-676

• Other models in the same series:
• Pioneer A-227
• Pioneer A-337
• Pioneer A-447
• Pioneer A-656 MK II
• Pioneer A-757 MK II
• Pioneer A-858

Pictures

• Excerpt from Test: Denon PMA-860, Dual CV-5670, Pioneer A-656 II, Sony TA-F 550 ES

Reports

• Report in "FonoForum" 7 / 1991

• External differences to the A-656: smaller knobs replaced by cylindrical versions resembling the large knobs.
• Golden dot only on the volume potentiometer.
• Inside: still horizontal circuit boards, but already no honeycomb housing around the volume potentiometer at the back right of the unit anymore