Fisher QP-44
Little is documented about the Fisher QP-44 headphones beyond a period listing. The record shows a set of open-back (presumed) stereo headphones from the early 1970s. They switch between conventional two-channel and quadraphonic (four-channel) operation, which put them at the fringe of the quad boom. HiFI-Stereo (1974, p.114) listed the QP-44 at $69.95 with a frequency response of 20-18,000 Hz, sensitivity rated at 10 mV for average listening levels, and a maximum input of 0.2 watts into 8 ohms. They came with a 10-foot coiled cord and weighed about 20 ounces.
That same directory entry notes a switchable 2-channel/4-channel mode. No technical details of the switching circuit survive in the public record. A separate Audio reference (September 1973, p.94) confirms the model was on the market by late 1973. Given the weight and the quad capability, the QP-44 was likely a higher-end offering in Fisher's headphone line, aimed at enthusiasts experimenting with early four-channel sources. No service manual, schematics, or user reviews from the period appear to have survived.
- Type: 2/4-channel stereo headphones
- Frequency response: 20–18,000 Hz
- Sensitivity: 10 mV for average listening
- Max. power: 0.2 W
- Impedance: 8 ohms
- Cord: 10-ft coiled
- Weight: 20 oz
- Price (1974): $69.95
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