• Country
• United States of America (USA)

• Manufacturer / Brand
• Marantz (Sound United LLC); Vista, CA

• Year
• 1985–1990

• Category
• Audio Amplifier or -mixer

• Radiomuseum.org ID
• 252204

Click on the schematic thumbnail to request the schematic as a free document.

• Number of Transistors
• Semiconductors present.

• Semiconductors

• Main principle
• Audio-Amplification

• Wave bands
• - without

• Details
• Hi-Fi equipment

• Power type and voltage
• Alternating Current supply (AC) / 220; 240 Volt

• Loudspeaker
• - For headphones or amp.

• Material
• Metal case

• from Radiomuseum.org
• Model: Graphic Equalizer Spectrum Analyzer EQ551 - Marantz Sound United LLC;

• Shape
• Book-shelf unit.

• Dimensions (WHD)
• 420 x 73 x 194 mm / 16.5 x 2.9 x 7.6 inch

• Notes

• A 2 x 10 frequency band graphic equalizer (one per channel) with 12dB cut or boost per band and a 10 band fluorescent display, built-in pink-noise generator and supplied microphone. Jack for microphone, RCA phono sockets for input/output Line and Tape.

  Specification
  Audio Section
  Rated Output	1V
  Total Harmonic Distortion at Rated Output	0.005% (20Hz-20kHz)
  I.M. Distortion at Rated Output	0.005%
  Frequency Response	10Hz-50kHz ±1dB
  Signal-to-Noise Ratio (A weighted)	110dB
  Input Impedance Line In	47kΩ
  Channel Balance Line	±1dB
  Inter Channel Crosstalk (1kHz) Line	60dB
  Output Voltage (1kHz) Line	7V
  Output Impedance (1 kHz) Line Out	600Ω
  EQ Action	(31.5Hz, 63Hz, 125Hz, 250Hz, 500Hz,  1kHz, 2kHz, 4kHz, 8kHz, 16kHz) ±10dB

  Power Requirement  :   220/240V AC 50/60Hz with voltage selector
  Power Consumption :   8 Watts

  Made in Japan

• Net weight (2.2 lb = 1 kg)
• 2.7 kg / 5 lb 15.2 oz (5.947 lb)

• Mentioned in
• -- Original prospect or advert (1985-86 Marantz Hi-Fi Video catalogue & 1990 Not for the casual listener catalogue)

• Literature/Schematics (1)
• - - Manufacturers Literature (Service manual EQ551 Graphic Equalizer dated 1986/2)

• Author
• Model page created by Bartosz Szwed. See "Data change" for further contributors.

• Other Models

• Here you find 568 models, 559 with images and 90 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Marantz (Sound United LLC); Vista, CA