• Country
• United States of America (USA)

• Manufacturer / Brand
• ESS Electrostatic Sound Systems, Inc.; Sacramento, CA

• Year
• 1974–1976

• Category
• Loudspeaker, headphone or earphone

• Radiomuseum.org ID
• 332294

• • Brand: ESS

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

• Wave bands
• - without

• Power type and voltage
• No Power needed

• Loudspeaker
• 2 Loudspeakers

• Material
• Wooden case

• from Radiomuseum.org
• Model: Heil amt5 - ESS Electrostatic Sound

• Shape
• Book-shelf unit.

• Dimensions (WHD)
• 368 x 609 x 323 mm / 14.5 x 24 x 12.7 inch

• Notes

• 2 way, 2 driver loudspeaker system.

  Frequency Response: 40 Hz to 20 kHz
  Crossover Frequency: 1500 Hz
  Impedance: 4 Ω

  Bass: 1 x 12"
  Tweeter: 1 x ESS Heil air motion transformer

  "The ESS Heil power-ring tweeter has a miniaturized sixteen-fold diaphragm, suspended in a powerful magnetic field, which radiates through precision machined slots in a ferrous metal ring. It operates with the identical and unique air squeezing principle of the larger ESS Heil midrange/tweeter air-motion transformers to achieve an equivalent transient clarity, wide stereo imaging and complete freedom from fatigue-producing distortion."

• Net weight (2.2 lb = 1 kg)
• 35 lb (35 lb 0 oz) / 15.890 kg

• Price in first year of sale
• 189.00 $

• Mentioned in
• Stereo Review, Dec. 1974

• Other Models

• Here you find 3 models, 3 with images and 2 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from ESS Electrostatic Sound Systems, Inc.; Sacramento, CA