Sennheiser HD-44
Not much information survives on the Sennheiser HD-44. What the record shows comes from a 1977 headphone roundup. It describes the HD-44 as a lightweight stereo headphone, 1.2 ounces without cable, using Sennheiser's patented dynamic "open-aire" system in an under-the-chin configuration. It was rated at 600 ohms per channel, with a frequency response of 52-10,000 Hz, according to HiFI-Stereo (1977, p.165).
That is essentially all the period documentation gives us. There is no price, no driver size, no production date, and no substantial review commentary. The HD-44 seems to have been a compact, comfort-oriented open headphone from Sennheiser's early open-aire line, but the archives are otherwise quiet.
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