ATL HD 311 specifications

Category : Speakers

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Tech nical data

Special equipment

Other models of the same series:

  • Manufacturer: ATL
  • Model: HD 311
  • Years of construction: 1987-1989
  • Manufactured in: Germany
  • Colors:
  • Dimensions 246 x 906 x 373 mm (W x H x D)
  • Weight:
  • Original price approx.: DM 1.100,--/piece
  • Type of construction: 3-way with horn resonator
  • Chassis:
    • Woofer: 2x 162 mm Westra SW 180-808, 8 Ohm
    • Midrange: 87 mm Seas 10 F-M H084, 8 Ohm
    • Tweeter: 28 mm modified isophon KK10 fabric dome, 4 ohm
  • Load capacity (nominal/musical b.): 110 Watts
  • Efficiency:
  • Frequency response: 21 - 23,000 Hz
  • Transition ranges: 130 Hz (horn resonator)/1650/6100 Hz
  • Impedance: 6 Ohm s
  • Woofer: 2x 162 mm Westra SW 180-808.8 ohms
  • Midtone: 87 mm Seas 10 F-M H084, 8 ohms
  • Hightone: 28 mm modified isophone KK10 fabric dome, 4 ohms
  • Horn resonator
  • "Acoustically Active" crossover:
    • HT: 2nd order high pass, 3.3 uF | 0.15 mH
    • MT: 1st order high pass, 4.7uF
    • TT: 1st order low pass, approx. 0.9 mH
  • HT: 2nd order high pass, 3.3uF |0.15 mH
  • MT: 1st order high pass, 4.7uF
  • TT: 1st order low pass, about 0.9 mH
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