Cambridge (Physics) 310
Period references point to two very different products with this model number: a three-way loudspeaker system from the early 1980s, and a much older FM broadcast monitor tuner from the mid-1950s. The Archive's research turned up no definitive product type, production years, or original price, so it's uncertain which one is the "Cambridge 310" this entry is meant for. What follows is what the period reviews show.
The better documented of the two is the Cambridge Physics 310, a three-way acoustic-suspension loudspeaker reviewed in Audio (November 1982, p.71). It used a 10-inch woofer in a sealed enclosure, a 4½-inch cone midrange, and a 1-inch dome tweeter crossing over at 4 kHz. Crossover frequencies were 520 Hz and 4 kHz. The cabinet was oiled walnut and weighed nearly 50 lbs (23 kg). The manufacturer suggested bookshelf placement, but Audio noted the weight made a very sturdy shelf advisable. Frequency response was rated at 30 Hz to 20 kHz ±1.5 dB, sensitivity at 84 dB for 1 watt at 1 meter, and nominal impedance at 8 ohms (6 ohms minimum). Dimensions were approximately 15¼ inches wide by 26⅜ inches tall. Depth was not given in the surviving text.
A second, much earlier reference appears in High Fidelity (May 1955, p.14) for a "310 FM Broadcast Monitor Tuner," described as a professional-quality component from "one of the world's leading makers of laboratory instruments for sound measurement." It featured 2-megacycle wide-band circuitry and single-sweep tuning with interstation noise suppression. The available sources don't record which of the two the Archive's "Cambridge 310" entry is meant to cover. If you own either unit or have documentation, the Archive welcomes a correction.
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