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  • aLLEN SPEAKER

    Hallo, what´s the difference between a HC-15 and HC -12 Allen speakers?
    rEGARDS cHRIS

  • #2
    HC-12 is a sealed system, with dual midrange drivers; HC-15 is a ported system with a single midrange driver. The HC-12 has 6 dB per octave crossover; the HC-15 is 12 dB per octave. The HC-15 appears to have a slightly higher bass to midrange crossover point, though the design does not follow any midrange topology I am familiar with.

    The HC-12 will go lower, and has a fatter bass sound; the HC-15 is flatter in low frequency response and enough so that Allen add a bass boost circuit for some channels that have 16' flue stops that go through HC-15's. I believe the HC-15 is slightly higher efficiency.

    The HC-12 is sometimes used for 32' pedal Contra Bourdon stop with marginal performance on the bottom notes.

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    • #3
      Toodles,

      Couldn't have provided better information myself. I learn something from everything you post. Thanks for the detail on the dB/octave on the crossovers.

      Michael
      Way too many organs to list, but I do have 5 Allens:
      • MOS-2 Model 505-B / ADC-4300-DK / ADC-5400 / ADC-6000 (Symphony) / ADC-8000DKC
      • Lowrey Heritage (DSO-1)
      • 11 Pump Organs, 1 Pipe Organ & 7 Pianos

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